jharbestonus at gmail
Apr 7, 2012, 4:37 PM
Views: 1255
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Re: Kernel Crash when starting up in au0828-video.c line 895
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On Apr 7, 2012, at 6:30 PM, Mark Lord wrote:
> On 12-04-07 05:54 PM, jrh wrote:
>> greetings!
>>
>> I think I have uncovered a nasty little bug in either the referenced module, or something is fishy happening.
>>
>> This occurs at boot time when mythbackend is starting up. I can't make a copy of the dump info as it is not responsive, even though there is mouse movement.
>>
>> I have enabled analog video using an HVR950Q tuner. Prior to setting up the tuner in mythbackend, tvtime was able to watch analog video via the ntsc cable tuner.
>
> The HVR950Q suffers from race conditions between the various
> kernel modules that control different internal parts of the device.
>
> The standard way of avoiding most of the issues is to blacklist au0828
> so that the kernel won't autoload it at boot time.
>
> Then, just before starting mythbackend, manually insmod au0828,
> and then delay (sleep for a couple of seconds).
>
> After which it's usually working.
>
> I have a script that does this for me in a somewhat fancier fashion,
> resetting the 950Q's beforehand, and then loading xc5000/au0828 in
> the order that seems to work, with the magic sleeps.
>
> But it's not too hard to roll one's own, either.
>
> Cheers
>
>
Background information: I am running mythbuntu 1204 beta, with the.25 version that was built 0406 build 0401ecad.
I did the above steps manually, and I am still having the kernel crash.I did find that the last thing done in mythbackend was the following line
Apr 7 19:20:13 myth1204 mythbackend[2224]: I CoreContext v4lchannel.cpp:661 (SetInputAndFormat) V4LChannel(/dev/video0): SetInputAndFormat(1, NTSC) (v4l v2) input_switch: 0 mode_switch: 1
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