Hi Bruce The Webcam does not seem to be following the standard and at some point the driver gives up: [ 6.906419] usb 3-7: Found UVC 1.50 device ACER HD User Facing (0408:4033) [ 6.935011] usb 3-7: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround. [ 6.938200] uvcvideo 3-7:1.1: Failed to query (129) UVC probe control : 26 (exp. 48). [ 6.938208] uvcvideo 3-7:1.1: Failed to initialize the device (-5). Here you can see that the camera is identified as uvc1.5, which should return 48 bytes for video_ctrl, but only returns 26, as in uvc1.0 If it works from windows maybe you should be able to record some traces from windows so you can figure out how they are doing the probing differently and add a quirk for it. Regards! On Sun, 26 Jun 2022 at 19:33, Bruce Liu <rainman59118@xxxxxxxxx> wrote: > > Hi, > > > I'm on Arch with somehow new model of Acer Aspire 5, A515-57-52NZ to be percise. > > > The webcam failed to work, while it does work under Windows 11 on the > same box and the (I believe) same condition/setting. > > > There is no hardware killer switch on this model, nor button switch, > as far as I've checked in and out. > > > $ uname -a > > Linux host 5.18.6-hardened1-1-hardened #1 SMP PREEMPT_DYNAMIC Wed, 22 > Jun 2022 19:50:53 +0000x86_64 GNU/Linux > > > the attachment includes lsusb.log and partial dmesg.log > > > hope they would be helpful for you to debug. > > > Also, consider donation, is there direct method or should I just go to > the Linux Foundation for this? Since somehow, > https://www.ideasonboard.org/uvc/#introduction has no links to this > issue? -- Ricardo Ribalda
