Re: [linux-uvc-devel] Acer Usb Camera 5986:055a recognized but no /dev/video0 entry

[Henrik I. <hen...@av...>]

Hi Samir

Yes, that is indeed the correct link. Seems like the thread is already
in 2 parts, I linked to the beginning by accident.

I'm interested to help. I've already used today to upgrade to Ubuntu
15.10 (I know it will not fix anything, but just to start from the
newest base system) and checked out the Ubuntu wily kernel source
package from git://kernel.ubuntu.com/ubuntu/ubuntu-wily.git. While
writing this while doing a test build just to see that I can compile
and start my own kernel.

Looking at the source, if I understand your idea correctly, your
proposal would be to add something like a
UVC_QUIRK_IGNORE_CHAINING_ERRORS and I could then install my module
with

modbrobe uvcvideo=<magic number>

Would the next step then be to also hardcode this quirk to be
automatically in effect for known camera models in uvc_ids[]?

Long term, is there any problem in just ignoring the errors vs finding
out why the chaining checks fail?

Thanks for helping!
henrik
PS: As suggested by James, I've attached the output of lsusb -v -d

On Fri, Dec 4, 2015 at 2:57 AM, Samir Ibradžić <sib...@gm...> wrote:
> Henrik,
>
> This is probably the thread you need to check;
> http://sourceforge.net/p/linux-uvc/mailman/message/34181466/
>
> I already proposed to implement a new quirk, an uvc module switch that
> would ignore all chain probing issues. This may not only help this
> particular Lenovo cam, but others as well. Are you interested to help a
> bit with coding and testing?
>
> R,
> S
>
> On 2015年12月04日 08:27, James Fidell wrote:
>> On 03/12/15 20:54, Henrik Ingo wrote:
>>
>>> I've just bought a Lenovo E550 and disappointed to learn that I can no
>>> longer trust the Thinkpad brand to use HW that is supported in Linux.
>>> I know some C, but don't have any experience with kernel stuff. Is the
>>> problem with this unsupported webcam something I could perhaps fix?
>>> >From the email thread it seems the camera would work if it would just
>>> be identified correctly, is this the case?
>>
>> I suspect it may be more complex than that.
>>
>> The error given suggests that the device isn't advertising anything
>> that the driver recognises to be a meaningful list of input terminals
>> and processing units.  That's probably rather more difficult to fix
>> than the driver not recognising the camera as a genuine UVC camera.
>>
>> In fact, it looks like the camera does recognise the device as a UVC
>> camera, but it's not behaving the way a UVC camera is expected to.
>>
>> I'm not sure I'll be able to help personally, but the output of
>> lsusb -v -d 5986:055a might be a good place to start.
>>
>> James
>>
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