Re: [linux-uvc-devel] 058f:0806 Alcor Micro Corp

[Walter <wa...@pr...>]

Solved.

Issue was as follows: Linux running within VirtualBox on OSX.
VirtualBox only supports USB1.1 without Oracle VM VirtualBox Extension
Pack. Once upgraded to USB2.0, everything worked fine.

You might wish to review the following:
 1. Upgrade to more helpful the nature of the error message(s)
displayed by v4l2-ctl in case of "VIDIOC_STREAMON: failed:
Input/output error".
 2. Troubleshooting/FAQ entry to double-check USB version in use with
device is 2.0+
 3. Highlight apparent common insufficient USB version/bus bandwidth
limitation, symptom is unable to stream images but configuration may
be seen/modified

Hope that helps someone else!

- Walter

On 23 November 2017 at 09:11, Walter <wa...@pr...> wrote:
> Precisely the same behavior observed (though able to query differing
> camera capabilities) with a different model camera from the same
> manufacturer, 058f:1412.
>
> - Walter
>
> On 22 November 2017 at 17:09, Walter <wa...@pr...> wrote:
>> Please note the bandwidth quirk has been tested as described but no
>> change was observed.
>>
>> Unsure if this is because the code was compiled in hard rather than as a module.
>>
>> - Walter
>>
>> On 22 November 2017 at 11:29, Walter <wa...@pr...> wrote:
>>> New camera from Shenzhen.
>>>
>>> Camera is detected fine, driver loads with some errors, settings may
>>> be queried and changed, however video or frame capture fails with
>>> "VIDIOC_STREAMON: failed: Input/output error" and dmesg seems to
>>> suggest some sort of bandwidth issue.
>>>
>>> Suggestions appreciated.
>>>
>>> Debug information attached.
>>>
>>> $ uname -a
>>> Linux gentoo 4.12.12-gentoo #7 SMP Tue Nov 21 03:51:45 -00 2017 x86_64
>>> Intel(R) Core(TM) i7-4960HQ CPU @ 2.60GHz GenuineIntel GNU/Linux