Re: [linux-uvc-devel] Cannot use webcam under Linux but works under windows

[Pierre D. <pie...@gm...>]

Hi Lucas,

First of all, thank you for your quick answer!!
Unfortunately, it did not work...I will ask the company if there is a
uvcdynctrl file or if they can tell me which extension units are supported.
If it doesn't work, is there any way to figure that out using a software
under Linux or under Windows (as the webcams are working under Windows).

Thanks again,

Pierre

On Jan 25, 2018 6:33 PM, "Lucas Magasweran" <luc...@gm...> wrote:

> Hi Pierre,
>
> On Thu, 2018-01-25 at 15:17 +0100, Pierre Daye wrote:
> > [  157.573136] uvcvideo: Failed to query (GET_DEF) UVC control 13 on
> > unit 1: -32 (exp. 8).
>
> These UVC GET_DEF errors could be causing a problem. Does your camera
> come with a uvcdynctrl xml file or datasheet that details the supported
> UVC extension units? The returned size appears to be wrong.
>
> Also, try the UVC_QUIRK_PROBE_DEF (0x00000100) quirk and see if that
> helps.
>
> From http://www.ideasonboard.org/uvc/faq/ :
>
> UVC_QUIRK_PROBE_DEF: Don't request the video probe and commit default
> values. Some cameras don't implement the GET_DEF request for the video
> probe and commit controls, or even completely crash when that request
> is received. The uvcvideo driver can then use the current values as
> default values.
>
>