Re: 4.17-rc3 regression in UVC driver

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Hello again,

On 05/05/18 08:34, Kieran Bingham wrote:
> Hi Sebastian,
> 
> On 04/05/18 19:45, Sebastian Reichel wrote:
>> Hi,
>> 
>> I just got the following error message every ms with 4.17-rc3 after 
>> upgrading to for first ~192 seconds after system start (Debian 
>> 4.17~rc3-1~exp1 kernel) on my Thinkpad X250:
>> 
>>> uvcvideo: Failed to query (GET_MIN) UVC control 2 on unit 1: -32 (exp. 
>>> 1).
> 
> I have submitted a patch to fix this ... (and I thought it would have got 
> in by now ... so I'll chase this up)


Mauro - I just saw Laurent sent a pull-request for this last week, so I guess
maybe it's on it's way:

[GIT FIXES FOR v4.17] UVC fixes (25/04/2018)

But perhaps it got missed ? - I don't see this patch in media/v4.17-4:

git log media/v4.17-4 --grep="media: uvcvideo: Prevent setting unavailable flags
"
<blank>

Anyway, I'll leave this in your hands.

- --
Regards

Kieran


> Please see : https://patchwork.linuxtv.org/patch/48043/ and apply the
> patch to bring your system logs back to a reasonable state :D
> 
> Laurent, Mauro,
> 
> This is the second bug report I've had on this topic. Can we aim to get 
> this patch merged please?
> 
>> I see /dev/video0 and /dev/video1. The first one seems to be functional. 
>> The second one does not work and does not make sense to me (the system 
>> has only one webcam). I did not try to bisect anything. Here is some
>> more information, that might be useful:
> 
> There are two device nodes now, as one is provided to output meta-data or 
> such.
> 
> 
>>> sre@earth ~ % mpv /dev/video1 Playing: /dev/video1 [ffmpeg/demuxer] 
>>> video4linux2,v4l2: ioctl(VIDIOC_G_INPUT): Inappropriate ioctl for 
>>> device [lavf] avformat_open_input() failed Failed to recognize file 
>>> format. sre@earth ~ % udevadm info /dev/video0 P: 
>>> /devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/video4linux/video0
>>> N: video0 E: DEVNAME=/dev/video0 E: 
>>> DEVPATH=/devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/video4linux/video0
>>>
>>>
>>> 
E: MAJOR=81
>>> E: MINOR=0 E: SUBSYSTEM=video4linux sre@earth ~ % udevadm info 
>>> /dev/video1 P: 
>>> /devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/video4linux/video1
>>> N: video1 E: DEVNAME=/dev/video1 E: 
>>> DEVPATH=/devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/video4linux/video1
>>>
>>>
>>> 
E: MAJOR=81
>>> E: MINOR=1 E: SUBSYSTEM=video4linux sre@earth ~ % lsusb -d 04ca:703c 
>>> Bus 001 Device 004: ID 04ca:703c Lite-On Technology Corp.
>> 
>> -- Sebastian
> 
> 
> Regards
> 
> Kieran
> 
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