Qemu（Archlinux）クライアントでカメラを操作しようとしています。ホストもArchlinuxシステムです。
lsusb以下に、出力で試したコマンドを示しますlspci。ゲストシステムを起動すると、接続した2台のカメラに2つの警告が表示されます（lenovo内蔵、Trust USB接続）。
その理由を説明する記事を見つけました。ここしかし、正確に何をすべきかはわかります。
この問題の原因は、仮想USBハブがデフォルトでUSB 1.1に設定されているためです。 VMを起動する前にUSB 2に変更すると、カメラは正常に表示されます。ただし、USB 3+ デバイスではまだ問題が発生する可能性があります。
- command to start the qemu machine:
$sudo qemu-system-x86_64 -smp 6 -m 4G -enable-kvm -vga std -soundhw ac97\
-usb -device usb-host,hostbus=1,hostaddr=11 -usb -device usb-host,hostbus=3,hostaddr=1 -usb -device usb-host,hostbus=3,hostaddr=2 -usb -device usb-host,hostbus=2,hostaddr=1 -usb -device usb-host,hostbus=1,hostaddr=1 -usb -device usb-host,hostbus=1,hostaddr=2 -usb -device usb-host,hostbus=1,hostaddr=3 -k en-uk -net nic,model=rtl8139 -net user -drive file=qemu-drive,format=raw
- warnings:
qemu-system-x86_64: Warning: speed mismatch trying to attach usb device "Lenovo EasyCamera" (high speed) to bus "usb-bus.0", port "2.6" (full speed)
qemu-system-x86_64: Warning: speed mismatch trying to attach usb device "Trust Webcam" (high speed) to bus "usb-bus.0", port "1" (full speed)
lsusb
Bus 003 Device 002: ID 8087:8001 Intel Corp.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 138a:0011 Validity Sensors, Inc. VFS5011 Fingerprint Reader
Bus 001 Device 006: ID 0cf3:3004 Atheros Communications, Inc. AR3012 Bluetooth 4.0
Bus 001 Device 003: ID 5986:0652 Acer, Inc
Bus 001 Device 010: ID 04d9:a029 Holtek Semiconductor, Inc.
Bus 001 Device 011: ID 145f:019f Trust
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
lspci
00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)
00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 09)
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03)
00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller #1 (rev 03)
00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 (rev e3)
00:1c.1 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #2 (rev e3)
00:1c.2 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #3 (rev e3)
00:1c.3 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #4 (rev e3)
00:1c.4 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #5 (rev e3)
00:1d.0 USB controller: Intel Corporation Wildcat Point-LP USB EHCI Controller (rev 03)
00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation Wildcat Point-LP SATA Controller [AHCI Mode] (rev 03)
00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03)
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5229 PCI Express Card Reader (rev 01)
08:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)
09:00.0 Network controller: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter (rev 01)
0a:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Sun XT [Radeon HD 8670A/8670M/8690M / R5 M330] (rev ff)