用于Khadas的Linux内核不支持触摸屏(缺少驱动程序？)

Question

我正试图在Khadas VIM3L上获得触摸屏显示。触摸屏是USB。一旦我把它插入SBC的两个USB中，就停止工作(不管我插入什么设备)。这是dmesg：

[ 8384.786265] usb 1-1.1: new full-speed USB device number 4 using xhci-hcd
[ 8384.907490] usb 1-1.1: New USB device found, idVendor=0416, idProduct=c168, bcdDevice= 0.00
[ 8384.907507] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 8384.907512] usb 1-1.1: Product: MTouch
[ 8384.907516] usb 1-1.1: Manufacturer: TSTP
[ 8384.907520] usb 1-1.1: SerialNumber: CMTP_1.0
[ 8395.322240] xhci-hcd xhci-hcd.2.auto: xHCI host not responding to stop endpoint command.
[ 8395.322254] xhci-hcd xhci-hcd.2.auto: USBSTS:
[ 8395.346452] xhci-hcd xhci-hcd.2.auto: xHCI host controller not responding, assume dead
[ 8395.348739] xhci-hcd xhci-hcd.2.auto: HC died; cleaning up
[ 8395.354199] usb 1-1: USB disconnect, device number 2
[ 8395.354932] usb 1-1.1: USB disconnect, device number 4
[ 8395.356118] usb 1-1.2: USB disconnect, device number 3

我尝试了4.9和主线内核，尝试了不同的操作系统，但结果保持不变。

这是我的工作站上的dmesg，该触摸屏实际上可以工作(当然是不同的架构)：

[ 1855.744065] usb 1-2: new full-speed USB device number 8 using xhci_hcd
[ 1855.897352] usb 1-2: New USB device found, idVendor=0416, idProduct=c168, bcdDevice= 0.00
[ 1855.897367] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1855.897373] usb 1-2: Product: MTouch
[ 1855.897377] usb 1-2: Manufacturer: TSTP
[ 1855.897381] usb 1-2: SerialNumber: CMTP_1.0
[ 1855.900892] input: TSTP MTouch as /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0/0003:0416:C168.0006/input/input31
[ 1855.964524] hid-generic 0003:0416:C168.0006: input,hidraw5: USB HID v1.11 Mouse [TSTP MTouch] on usb-0000:00:14.0-2/input0
[ 1855.967057] input: TSTP MTouch as /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.1/0003:0416:C168.0007/input/input32
[ 1855.967237] hid-generic 0003:0416:C168.0007: input,hidraw6: USB HID v1.11 Device [TSTP MTouch] on usb-0000:00:14.0-2/input1
[ 1856.060779] input: TSTP MTouch as /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.1/0003:0416:C168.0007/input/input33
[ 1856.061121] hid-multitouch 0003:0416:C168.0007: input,hidraw6: USB HID v1.11 Device [TSTP MTouch] on usb-0000:00:14.0-2/input1

Answer 1

尝试在bios中关闭iommu，然后尝试在内核参数中添加iommu=soft。

Source=https://www.mail-archive.com/ubuntu-bugs@lists.ubuntu.com/msg5738917.html