linux-kernel - Re: Logitech QuickCam USB detected by Linux, but not user space applications

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Message-ID: <90a7e0e2-ddbb-7762-3eb6-51db0570ffff@molgen.mpg.de>
Date:   Thu, 22 Nov 2018 22:43:11 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Logitech QuickCam USB detected by Linux, but not user space
 applications

Dear Hans,


Am 22.11.18 um 13:43 schrieb Hans Verkuil:

> On 11/16/2018 03:39 PM, Paul Menzel wrote:

>> On 11/15/18 12:38, Mauro Carvalho Chehab wrote:
>>> Em Thu, 15 Nov 2018 11:42:32 +0100 Paul Menzel escreveu:
>>
>>>> I tried to get a Logitech QuickCam USB camera working, but unfortunately, it is
>>>> not detected by user space (Cheese, MPlayer).
>>>
>>> Could you please try it with Camorama?
>>>
>>> 	https://github.com/alessio/camorama
>>
>> Thank you for the suggestion. At first, I only saw a black image, but changing the
>> resolution made it work. See the status below.
>>
>> 1.  does *not* work
>>
>>      a)  160x120
>>      b)  176x144
>>
>> 2.  works
>>
>>      a)  320x240
>>      b)  352x288
> 
> Try this patch:
> 
> https://patchwork.linuxtv.org/patch/53043/
> 
> It probably fixes the same problem you are experiencing.

It indeed does. I cherry picked it to Linus’ master branch, and it fixed 
the problem.

Tested-by: Paul Menzel <pmenzel@...gen.mpg.de> (Logitech QuickCam 046d:092e)

[…]


Kind regards,

Paul