linux-kernel - Re: Linux logs error `Failed to query (GET_CUR) UVC control X on unit Y: -75 (exp. 1).` (75 == EOVERFLOW?)

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Message-ID: <2a2cac3c-f9cd-4b20-ae53-9e6963c7889f@molgen.mpg.de>
Date: Fri, 19 Jul 2024 13:33:49 +0200
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Greg KH <gregkh@...uxfoundation.org>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>, linux-media@...r.kernel.org,
 linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
 Ricardo Ribalda <ribalda@...omium.org>
Subject: Re: Linux logs error `Failed to query (GET_CUR) UVC control X on unit
 Y: -75 (exp. 1).` (75 == EOVERFLOW?)

Dear Laurent,


Thank you for your quick response.

Am 19.07.24 um 11:38 schrieb Laurent Pinchart:
> (CC'ing Ricardo)
> 
> On Fri, Jul 19, 2024 at 08:05:35AM +0200, Greg KH wrote:
>> On Fri, Jul 19, 2024 at 07:22:54AM +0200, Paul Menzel wrote:

>>> Today, starting the Intel Kaby Lake laptop Dell XPS 13 9360/0596KF, BIOS
>>> 2.21.0 06/02/2022 with
>>>
>>>      Bus 001 Device 004: ID 0c45:670c Microdia Integrated Webcam HD
>>>
>>> Linux “6.11-rc0” (v6.10-8070-gcb273eb7c839) logged UVC errors:
>>
>> Does 6.10-final have the same issue?

No, it does not. Linux 6.10-04829-ge2f710f97f35 (Merge tag 
'ata-6.11-rc1' of 
git://git.kernel.org/pub/scm/linux/kernel/git/libata/linux) does also 
not show this, and 6.10-rc3-00148-g8676a5e796fa (media: uvcvideo: Fix 
integer overflow calculating timestamp) neither.

>> If not, can you use 'git bisect' to track down the offending commit?

I am on it. I tried to pass the USB device through to a VM and try to 
reproduce there. Thank you for the comment, that reloading the module is 
(of course) also possible. That avoids rebooting the system.

>> There have not been any USB changes in Linus's tree yet, but there have
>> been a bunch of media changes, so perhaps something in the uvc driver is
>> causing this?
> 
> We've merged quite a few changes for the uvcvideo driver recently.
> Bisecting the problem would help greatly. It could also be helpful to
> set the uvcvideo module 'trace' parameter to 0xffff (e.g. add
> `uvcvideo.trace=0xffff` to the kernel command line, or unload and reload
> the uvcvideo module with the parameter set to 0xffff) and give us the
> additional messages printed to the kernel log.

```
[   10.688580] usb 1-5: Adding mapping 'Brightness' to control 
00000000-0000-0000-0000-000000000101/2
[   10.689134] usb 1-5: Failed to query (GET_CUR) UVC control 2 on unit 
2: -75 (exp. 1).
[   10.689209] usb 1-5: Added control 
00000000-0000-0000-0000-000000000101/3 to device 5 entity 2
[   10.691085] usb 1-5: Adding mapping 'Contrast' to control 
00000000-0000-0000-0000-000000000101/3
[   10.691645] usb 1-5: Failed to query (GET_CUR) UVC control 3 on unit 
2: -75 (exp. 1).
[   10.691709] usb 1-5: Added control 
00000000-0000-0000-0000-000000000101/6 to device 5 entity 2
[   10.692729] usb 1-5: Adding mapping 'Hue' to control 
00000000-0000-0000-0000-000000000101/6
[   10.693530] usb 1-5: Failed to query (GET_CUR) UVC control 6 on unit 
2: -75 (exp. 1).
[   10.693604] usb 1-5: Added control 
00000000-0000-0000-0000-000000000101/7 to device 5 entity 2
[   10.698164] usb 1-5: Adding mapping 'Saturation' to control 
00000000-0000-0000-0000-000000000101/7
[   10.699621] usb 1-5: Failed to query (GET_CUR) UVC control 7 on unit 
2: -75 (exp. 1).
[   10.699708] usb 1-5: Added control 
00000000-0000-0000-0000-000000000101/8 to device 5 entity 2
[   10.700676] usb 1-5: Adding mapping 'Sharpness' to control 
00000000-0000-0000-0000-000000000101/8
[   10.701263] usb 1-5: Failed to query (GET_CUR) UVC control 8 on unit 
2: -75 (exp. 1).
[   10.701325] usb 1-5: Added control 
00000000-0000-0000-0000-000000000101/9 to device 5 entity 2
[   10.702991] usb 1-5: Adding mapping 'Gamma' to control 
00000000-0000-0000-0000-000000000101/9
[   10.705787] usb 1-5: Failed to query (GET_CUR) UVC control 9 on unit 
2: -75 (exp. 1).
[   10.705860] usb 1-5: Added control 
00000000-0000-0000-0000-000000000101/10 to device 5 entity 2
[   10.707036] usb 1-5: Adding mapping 'White Balance Temperature' to 
control 00000000-0000-0000-0000-000000000101/10
[   10.708098] usb 1-5: Failed to query (GET_CUR) UVC control 10 on unit 
2: -75 (exp. 1).
[   10.708150] usb 1-5: Added control 
00000000-0000-0000-0000-000000000101/1 to device 5 entity 2
[   10.709279] usb 1-5: Adding mapping 'Backlight Compensation' to 
control 00000000-0000-0000-0000-000000000101/1
[   10.710748] usb 1-5: Failed to query (GET_CUR) UVC control 1 on unit 
2: -75 (exp. 1).
[   10.711147] usb 1-5: Added control 
00000000-0000-0000-0000-000000000101/4 to device 5 entity 2
[   10.713670] usb 1-5: Adding mapping 'Gain' to control 
00000000-0000-0000-0000-000000000101/4
[   10.714623] usb 1-5: Failed to query (GET_CUR) UVC control 4 on unit 
2: -75 (exp. 1).
[   10.715104] usb 1-5: Added control 
00000000-0000-0000-0000-000000000101/5 to device 5 entity 2
[   10.803567] usb 1-5: Adding mapping 'Power Line Frequency' to control 
00000000-0000-0000-0000-000000000101/5
[   10.803573] usb 1-5: Added control 
00000000-0000-0000-0000-000000000101/11 to device 5 entity 2
[   10.804683] usb 1-5: Adding mapping 'White Balance, Automatic' to 
control 00000000-0000-0000-0000-000000000101/11
```

Full log attached.

> Could you also provide the output of `lsusb -v -d 0c45:670c` (running as
> root if possible) ?

Attached.


Kind regards,

Paul
View attachment "20240719--linux-6.10+--uvcvidio-trace.txt" of type "text/plain" (98487 bytes)

View attachment "dell-xps-13-9360--lsusb-vd-0c45-670c.txt" of type "text/plain" (7519 bytes)