DerAlbi

Indeed. However since i have another issue with a too slow hardware counter interrupt inside the VM here i wanted to try the other Bios and see if the problem still persists. Meanwhile i have confirmed that the APIC-Counter is only 2kHz in both windows and Linux (under SeaBios) which is a no go.

Hi guys, i want to try out a LiveCD of a special Linux version which is based on "wheezy". AFAIK this is a version of Debian. So i used the Debian VM template, added the path to the OS Install ISO and went for it. Now i am simply stuck in the UEFI screen whith no instructions what to do next. I googled around what to do in the "UEFI Interactive Shell" too boot from CD but honestly i just feel lost with this kind of user interface if you can call it that. Its the Debian template.. when i give it the install-ISO why cant it simply start up ? Can anyone help?

Important information to add: The timing withing the CNC control program is created using the APIC-Timer. I got the distinct feeling that the emulated or passedthrough? APIC timer has a rather low frequency so the required minium of 25kHz cannot be reached. Or maybe the interrupt is served not often enough, if emulated. I tried to remove the <apic/> from the <features> to see if the CNC programm has a fallback option or software emulation or whatever.. however it keeps saying that the apic is present. :-( Any ideas with this addional information? Meanwhilei confirmed the strange APIC behavior under Windows and Linux (LinuxCNC based on Debian Wheezy). See the strange timing in the attached image. 1ms -> 2ms. 25us -> 500us.

Please see the information below. The problem was identified more pecisely after the thread was created. Old Text: Hi guys. I recently bought a CNC Milling machine which is controled via parallel port and i am using WinXP 32bit in a VM to get the software going. My PC does not have on board parallel port so i bought an PCIe extension card. The Card shows up in the PCI-Devices list as: 06:00.0 Serial controller [0700]: MosChip Semiconductor Technology Ltd. Device [9710:9905] 06:00.2 Parallel controller [0701]: MosChip Semiconductor Technology Ltd. PCIe 9912 Multi-I/O Controller [9710:9912] So i passed the device through with: <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x06' slot='0x00' function='0x0'/> </source> <alias name='hostdev0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </hostdev> <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x06' slot='0x00' function='0x2'/> </source> <alias name='hostdev1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </hostdev> At least thats what Unraid creates with my input. I orignially said: <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x06' slot='0x00' function='0x0'/> </source> <alias name='hostdev0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0' multifunction='on'/> </hostdev> <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x06' slot='0x00' function='0x2'/> </source> <alias name='hostdev1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x2'/> </hostdev> But that doesnt get saved. Whatever. It works in Windows XP. Devices detected, drivers installed and the CNC can be controlled. BUT: the CNC control program needs a solid connection to the parallel port. It is usually controlling the parallel port with 25kHz update rate, however my windows does reach exactly 2kHz not more, not less. I tried several expeansion cards and all show the same behavior. Right now i have a "DS 30020-1" inserted which supports up to 2.5Mbps. Given its an 8bit serial port, the 2.5Mbps translates to 312.5kHz toggle rate, so its not a hardware limitation. I kind of hope that anyone can tell be what in unraid / kvm or whatever hold the hardware back... Additional Info: i have 2 cores (3, 9) assigned to the VM. Both cores are not in use by other VMs.. (3, 9) is a core/thread-pair. (its a 6C12T cpu) I played around with the "hpet"-counter and set the present="yes" however this didnt help. Addionally the VirtIO-Serial driver in WinXP 32bit says "device can not start" Same with the GT730 thats passed through. Any ideas would be great. Whole XML: <domain type='kvm'> <name>Windows XP</name> <uuid>216e462b-f93e-f26d-8881-066f3790edb3</uuid> <metadata> <vmtemplate xmlns="unraid" name="Windows XP" icon="windowsxp.png" os="windowsxp"/> </metadata> <memory unit='KiB'>1048576</memory> <currentMemory unit='KiB'>1048576</currentMemory> <memoryBacking> <nosharepages/> <locked/> </memoryBacking> <vcpu placement='static'>2</vcpu> <cputune> <vcpupin vcpu='0' cpuset='3'/> <vcpupin vcpu='1' cpuset='9'/> </cputune> <os> <type arch='x86_64' machine='pc-i440fx-2.5'>hvm</type> </os> <features> <acpi/> <apic/> </features> <cpu mode='host-passthrough'> <topology sockets='1' cores='1' threads='2'/> </cpu> <clock offset='localtime'> <timer name='rtc' tickpolicy='catchup'/> <timer name='pit' tickpolicy='delay'/> <timer name='hpet' present='no'/> </clock> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/local/sbin/qemu</emulator> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source file='/mnt/user/Shared/pcriver.com_Windows_XP_Pro_SP3_32_bit.iso'/> <target dev='hda' bus='ide'/> <readonly/> <boot order='2'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source file='/mnt/user/Shared/virtio-win-0.1.130.iso'/> <target dev='hdb' bus='ide'/> <readonly/> <address type='drive' controller='0' bus='0' target='0' unit='1'/> </disk> <disk type='file' device='disk'> <driver name='qemu' type='raw' cache='writeback'/> <source file='/mnt/user/domains/Windows XP/vdis1k.img'/> <target dev='hdc' bus='ide'/> <boot order='1'/> <address type='drive' controller='0' bus='1' target='0' unit='0'/> </disk> <controller type='usb' index='0' model='ich9-ehci1'> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x7'/> </controller> <controller type='usb' index='0' model='ich9-uhci1'> <master startport='0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0' multifunction='on'/> </controller> <controller type='usb' index='0' model='ich9-uhci2'> <master startport='2'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x1'/> </controller> <controller type='usb' index='0' model='ich9-uhci3'> <master startport='4'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x2'/> </controller> <controller type='pci' index='0' model='pci-root'/> <controller type='ide' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <controller type='virtio-serial' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </controller> <interface type='bridge'> <mac address='52:54:00:ad:6e:a6'/> <source bridge='br0'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <channel type='unix'> <source mode='connect'/> <target type='virtio' name='org.qemu.guest_agent.0'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> <input type='tablet' bus='usb'/> <input type='mouse' bus='ps2'/> <input type='keyboard' bus='ps2'/> <graphics type='vnc' port='-1' autoport='yes' websocket='-1' listen='0.0.0.0' keymap='de'> <listen type='address' address='0.0.0.0'/> </graphics> <video> <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x03' slot='0x00' function='0x0'/> </source> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </hostdev> <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x06' slot='0x00' function='0x0'/> </source> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </hostdev> <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x06' slot='0x00' function='0x2'/> </source> <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/> </hostdev> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/> </memballoon> </devices> </domain>

Meeeh :-) Maybe its me hwo dives the USB crazy...... I just update you... With https://lime-technology.com/forum/index.php?topic=36768.0 i am now able to get all the USB2.0 working. lspci | grep USB gives me 4 devices: 00:1a.0 <--USB2.0 00:1d.0 <--USB2.0 07:00.0 <--USB3.0 08:00.0 <--USB3.0 by writing <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x00' slot='0x1a' function='0x0'/> </source> </hostdev> <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x00' slot='0x1d' function='0x0'/> </source> </hostdev> I got the USB behaving like USB normally in the VM. This is great! Interestingly.. the same with the USB3.0-Ports would be ... <address domain='0x0000' bus='0x07' slot='0x00' function='0x0'/> but that does not work... so all my 3.0-USB-Port do not work within the VM... but i can use the USB3.0 to host the Unraid-USB-Stick. Stragely when i connect a 2nd keyboard to the USB3.0 its not even powered nor can i input anything to the unraid console. (while the usb stick works!?) I also managed to passthrough my PCI-Soundcard.. so its looking good. Maybe is just buy a PCI-USB-Expansion card... who cares. The really strange thing is: When i passthorugh all my USB2.0 while having connected the Unraid-Srtick us USB2.0 it of course goes crazy. When i passthorugh all my USB2.0 AND USB3.0 while having the Unraid-Stick connected to USB3.0 everything keeps working. This means that the USB3.0 passthrough does not work, but thats the adresses i get from "lspci"... so what to do here? Well. that controller was dicky all its life (Texas Instruments TUSB73x0) sooo maybe its just time to move on... If aynone knows how to get at least one USB3.0 (the part for the front panel would be nice) working.. please share :-) Ok.. this turns more into a build log for my system... Update: When i accept that i wont be able to use my USB3.0 and rather fit in a USB extension card, all my USB-Problems are gone now :-) Quite a "success"... I progessed with the Main-VM that does indeed behave like a bare metal PC now. I encountered audio stuttering with my passed through PCI Soundcard and also "micro"stuttering while gaming. These issued were solved by turning on ACS-Overwrite in the VM-Settings. Not sure what it does, but it helps somehow. I also setup my second VM... but i hadnt much luck to pass through my spare GT 730... it turns out that since this is the card the console is displayed on the card cant be used by a VM. This is a waste and not very nice :-( Specially because i cant use the console due to a lack of keyboard input... so this is really just wasted resources... i would wish one could disable the console... ssh is enough in that case. I also found topics in this forum that stated that true single GPU system cant use passthrough with nvidia cards. meeeh :-( I also would like to try using my other hard drives and makeing them visible to the Windows-VM.. but the test licence is a bit restrictive there :-( for now i just believe it will work I guess i have to wait for new hardware to arrive.... 3rd graphics card (argh!), PCI-USB extension...

Hi, i am new to Unraid and this is consequently my first post. I first describe my usecase: I have an i7 Desktop tower with Asrock X79-Professional Motherboard and 2 graphic cards (GTX670, GTX 730). My main goal is so setup a Virtual machine without internet connection but 3D-Acceleration for productive CAD-Workflow. This shall be achieved by setting up 2 VMs: one main VM (passthrough GTX670 for Gaming, Internet, Video and stuff) and the second VM (for work related stuff, passthrough to GTX730) which is accessed over RDP (both VMs shall run Win8.1) My main VM shall have access to all the USB-Connectors/Devices.. in the end it should behave like a bare metal PC capable of connecting to the other VM. My dream is to have an experience close to running bare metal windows plus access to a VM that has 3D support. (currently bare metal installed windows + VirtualBox doesnt cut it) I have trouble setting up the first VM. I managed to install Win8.1 but the USB-stuff is just not working. It is extremely difficult even to specify what the problems are... For now i just checked all USB-Devices in the VM-Config so i have access to them.. but not all devices are working including my mouse.. here are some of the Log-Statements: 2016-07-01T21:11:47.019806Z qemu-system-x86_64: libusb_set_configuration: -6 [bUSY] This does not happen, if i connect a 2nd Keyboard to the machine. With only one Keyboard connected it seems that the commandline (which starts on a monitor connected to the GTX730) of unraid uses the keyboard at the time the VM starts up... after i shut down the VM i can not type anything into the command line (..eg. to login) again. But if i restart the VM the keyboard can be accessed by the VM without that warning. Other problems are: libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 <--- happens a lot qemu-system-x86_64: hw/usb/core.c:551: usb_packet_check_state: Assertion `!"usb packet state check failed"' failed. and 2016-07-01T22:49:08.292864Z qemu-system-x86_64: Warning: speed mismatch trying to attach usb device "USB2.0 Camera" (high speed) to bus "usb.0", port "2.5" (full speed) ..happens for a lot of usb devices. when i remove a usb attachment: 2016-07-01T21:17:30.906405Z qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE] And i am not able to reconnect the device without reboot. I searched a lot and found topics about USB passthrough but honestly.. they were too complicated and without knowing what i do its really hard. From my research however i learned that its not welcome to request help without posting at least the XML... so... <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> <name>Coilbi Win8</name> <uuid>68ec2472-add3-7717-b262-eac643e83d47</uuid> <metadata> <vmtemplate name="Custom" icon="windows.png" os="windows"/> </metadata> <memory unit='KiB'>8388608</memory> <currentMemory unit='KiB'>8388608</currentMemory> <memoryBacking> <nosharepages/> <locked/> </memoryBacking> <vcpu placement='static'>4</vcpu> <cputune> <vcpupin vcpu='0' cpuset='0'/> <vcpupin vcpu='1' cpuset='1'/> <vcpupin vcpu='2' cpuset='2'/> <vcpupin vcpu='3' cpuset='3'/> </cputune> <os> <type arch='x86_64' machine='pc-i440fx-2.3'>hvm</type> </os> <features> <acpi/> <apic/> </features> <cpu mode='host-passthrough'> <topology sockets='1' cores='4' threads='1'/> </cpu> <clock offset='localtime'> <timer name='rtc' tickpolicy='catchup'/> <timer name='pit' tickpolicy='delay'/> <timer name='hpet' present='no'/> </clock> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/bin/qemu-system-x86_64</emulator> <disk type='file' device='disk'> <driver name='qemu' type='raw' cache='writeback'/> <source file='/mnt/disk1/Coilbi_Win8/vdisk1.img'/> <target dev='hdc' bus='virtio'/> <boot order='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source file='/mnt/user/Image/Windows81Pro64.iso'/> <target dev='hda' bus='ide'/> <readonly/> <boot order='2'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source file='/mnt/user/Image/virtio-win-0.1.102.iso'/> <target dev='hdb' bus='ide'/> <readonly/> <address type='drive' controller='0' bus='0' target='0' unit='1'/> </disk> <controller type='usb' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> <controller type='pci' index='0' model='pci-root'/> <controller type='ide' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <controller type='virtio-serial' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </controller> <interface type='bridge'> <mac address='52:54:00:c5:62:d8'/> <source bridge='br0'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <channel type='unix'> <source mode='bind' path='/var/lib/libvirt/qemu/channel/target/Coilbi Win8.org.qemu.guest_agent.0'/> <target type='virtio' name='org.qemu.guest_agent.0'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x1038'/> <product id='0x1219'/> </source> </hostdev> <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x1038'/> <product id='0x1212'/> </source> </hostdev> <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x046d'/> <product id='0x0826'/> </source> </hostdev> <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x0c45'/> <product id='0x7e0a'/> </source> </hostdev> <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x03eb'/> <product id='0x2141'/> </source> </hostdev> <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x1871'/> <product id='0x7670'/> </source> </hostdev> <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x1038'/> <product id='0x1600'/> </source> </hostdev> <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x05e3'/> <product id='0x0745'/> </source> </hostdev> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </memballoon> </devices> <qemu:commandline> <qemu:arg value='-device'/> <qemu:arg value='ioh3420,bus=pci.0,addr=1c.0,multifunction=on,port=2,chassis=1,id=root.1'/> <qemu:arg value='-device'/> <qemu:arg value='vfio-pci,host=01:00.0,bus=root.1,addr=00.0,multifunction=on,x-vga=on'/> </qemu:commandline> </domain> To troubleshoot i of course tried to eliminated troublesome USB devices. It turns out the only configuration that works without any usb related error is when i connect 2 keyboards to the machine and only check the 2nd keyboard to pass through to the VM. I found resources like this: https://lime-technology.com/forum/index.php?topic=36768.0 which i cant follow because i am too fresh to linux... i went so far that i seem to have 4 usb buses (USB2.0 -> 00:1a.0, 00:1d.0 USB3.0-> 07:00.0, 08:00.0) and my Unraid USB stick seems to be connected to Bus002 Dev003 ID 0781:5580... but what i do with that informtion... i dont know. Others say that USB does not work in general until i insert a PCI-Card for it.. http://lime-technology.com/forum/index.php?topic=33391.0 On the other hand... one shall assign at least one usb mouse an keyboard if one uses GPU passthough..... if all main board usb connectors seem unusable by unraid this is a challenging request... i do heavily depend on usb.. :-( Any ideas? Is it manageable via XML or do i need to buy USB-Extension cards? (i have 2 free PCIe slots, i think)? Will my setup ever work? Here is one complete startup log: ErrorWarningSystemArrayLogin 2016-07-01 22:49:04.115+0000: starting up libvirt version: 1.2.18, qemu version: 2.3.0 LC_ALL=C PATH=/bin:/sbin:/usr/bin:/usr/sbin HOME=/ QEMU_AUDIO_DRV=none /usr/bin/qemu-system-x86_64 -name Coilbi Win8 -S -machine pc-i440fx-2.3,accel=kvm,usb=off,mem-merge=off -cpu host -m 8192 -realtime mlock=on -smp 4,sockets=1,cores=4,threads=1 -uuid 68ec2472-add3-7717-b262-eac643e83d47 -nographic -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/Coilbi Win8.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x3 -drive file=/mnt/disk1/Coilbi_Win8/vdisk1.img,if=none,id=drive-virtio-disk2,format=raw,cache=writeback -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk2,id=virtio-disk2,bootindex=1 -drive file=/mnt/user/Image/Windows81Pro64.iso,if=none,id=drive-ide0-0-0,readonly=o=hostdev6 -device usb-host,hostbus=1,hostaddr=4,id=hostdev7 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -device ioh3420,bus=pci.0,addr=1c.0,multifunction=on,port=2,chassis=1,id=root.1 -device vfio-pci,host=01:00.0,bus=root.1,addr=00.0,multifunction=on,x-vga=on -msg timestamp=on Domain id=1 is tainted: high-privileges Domain id=1 is tainted: custom-argv Domain id=1 is tainted: host-cpu char device redirected to /dev/pts/0 (label charserial0) 2016-07-01T22:49:06.143995Z Warning: speed mismatch trying to attach usb device "HD Webcam C525" (high speed) to bus "usb.0", port "2.2" (full speed) 2016-07-01T22:49:06.178554Z Warning: speed mismatch trying to attach usb device "Atmel-ICE CMSIS-DAP" (high speed) to bus "usb.0", port "2.4" (full speed) 2016-07-01T22:49:06.182053Z Warning: speed mismatch trying to attach usb device "USB2.0 Camera" (high speed) to bus "usb.0", port "2.5" (full speed) 2016-07-01T22:49:07.483595Z qemu-system-x86_64: libusb_set_configuration: -6 [bUSY] 2016-07-01T22:49:08.288239Z qemu-system-x86_64: Warning: speed mismatch trying to attach usb device "HD Webcam C525" (high speed) to bus "usb.0", port "2.2" (full speed) 2016-07-01T22:49:08.289613Z qemu-system-x86_64: Warning: speed mismatch trying to attach usb device "Atmel-ICE CMSIS-DAP" (high speed) to bus "usb.0", port "2.4" (full speed) 2016-07-01T22:49:08.292864Z qemu-system-x86_64: Warning: speed mismatch trying to attach usb device "USB2.0 Camera" (high speed) to bus "usb.0", port "2.5" (full speed) 2016-07-01T22:49:10.300130Z qemu-system-x86_64: Warning: speed mismatch trying to attach usb device "HD Webcam C525" (high speed) to bus "usb.0", port "2.2" (full speed) 2016-07-01T22:49:10.301586Z qemu-system-x86_64: Warning: speed mismatch trying to attach usb device "Atmel-ICE CMSIS-DAP" (high speed) to bus "usb.0", port "2.4" (full speed) 2016-07-01T22:49:10.304837Z qemu-system-x86_64: Warning: speed mismatch trying to attach usb device "USB2.0 Camera" (high speed) to bus "usb.0", port "2.5" (full speed) 2016-07-01T22:49:45.467595Z qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE] 2016-07-01T22:49:45.467630Z qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE] 2016-07-01T22:49:45.467643Z qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE] 2016-07-01T22:49:45.467655Z qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE] 2016-07-01T22:49:45.467666Z qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE] libusb: error [_open_sysfs_attr] open /sys/bus/usb/devices/3-1.1/bConfigurationValue failed ret=-1 errno=2 libusb: error [_get_usbfs_fd] File doesn't exist, wait 10 ms and try again libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/003/004: No such file or directory 2016-07-01T22:49:47.477881Z qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE] 2016-07-01T22:49:47.477910Z qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE] 2016-07-01T22:49:47.477914Z qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE] libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/003/007: No such device libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/003/006: No such device libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/003/007: No such device libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/003/006: No such device libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/003/007: No such device libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/003/006: No such device libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 libusb: error [submit_bulk_transfer] submiturb failed error -1 errno=28 2016-07-01T22:50:45.198269Z qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE] 2016-07-01T22:50:45.198287Z qemu-system-x86_64: libusb_release_interface: -4 [NO_DEVICE] libusb: error [_open_sysfs_attr] open /sys/bus/usb/devices/2-1.6.2/bConfigurationValue failed ret=-1 errno=2 libusb: error [_get_usbfs_fd] File doesn't exist, wait 10 ms and try again libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/002/006: No such file or directory Interestingly the command line states "..-machine pc-i440fx-2.3,accel=kvm,usb=off," hmmh.