[mythtv-users] correctly setting permission for /dev/video* ubuntu 12.04+myth

[Allan Strand]

Will try the sleep.

Any more specifics on the fix you mention?    I have not updated the
firmware.  I'm a little wary of that given this thread:

http://www.mythtv.org/pipermail/mythtv-users/2012-March/330825.html

I'm running a 3.2 kernel and am unclear how to update the driver. Or even
where to go to find its source code.

thanks, Allan

On Thu, Jun 14, 2012 at 9:53 AM, Michael T. Dean <mtdean at thirdcontact.com>wrote:

> On 06/14/2012 09:08 AM, Allan Strand wrote:
>
>> Hi All,
>>
>> Ubuntu 12.04 and MythTV 0.25.1
>>
>> I have a hdpvr that works fine with the exception of color balance.  As
>> documented multiple places, the device can be controlled with 'v4l2-ctl'
>> and this issue can be fixed.
>>
>> So I have a bash script to change the settings using this approach that's
>> called by my channel change script.
>>
>> Unfortunately, the script does not seem to run when channel changing,
>> though it does when I run from command line.
>>
>> I suspect this is a permission problem, so I added mythtv (the user that
>> runs the backend) to the video group on this machine and verified that
>> group permissions on /dev/video1 (pvr-150 on video0) allow both reading and
>> writing.
>>
>> Still there seems to be no change to the device.  Also, I'm not sure
>> where to find stderr output from the channel change script.  It does not
>> seem to appear in the mythbackend log.
>>
>> Any pointers to solutions to what must be a common problem?
>>
>
> Perhaps you're running it too early--before MythTV sets it device
> settings?  Try putting a sleep in the channel change script before the
> color-fix script is run.
>
> Also, I think there's a fix for the "wrong colors with new HD-PVR firmware
> versions" available (in new kernels or something?).  Might want to just fix
> the issue, instead of working around it.
>
> Mike
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