Xorg crash on HD6450

[Alex Deucher]

On Wed, Feb 19, 2014 at 2:18 PM, Xavier Bestel <xavier.bestel at free.fr> wrote:
> Le mercredi 13 novembre 2013 à 12:19 +0900, Michel Dänzer a écrit :
>> On Die, 2013-11-12 at 16:15 +0100, Xavier Bestel wrote:
>> >
>> > is the following kernel Oops expected ?
>>
>> An oops is not expected by definition.
>>
>>
>> > It happens right when starting Xorg, on a kernel 2.12-rc7 (from debian).
>> > If not I'll file a bug.
>>
>> Please try 3.12 final first. If the problem persists, it would be great
>> if you could bisect.
>
> I just tried exchanging cards again, and now the Oops is gone.
> But instead I have something really strange: audio sometimes works for a
> few seconds (but often not), and thereafter if I try something like
> aplay sound.wav it's stuck for a while and aborts saying something like
> "delay exceeded" (translated from french).
>
> Nothing in the logs, the only suspect line in the dmesg is:
> [   31.762590] [drm:evergreen_hdmi_write_sad_regs] *ERROR* Couldn't read SADs: 0
> but googling for it seems to show it's benign.
>

Well, it's benign, but it also means your monitor doesn't provide
proper SAD information which may be why hdmi audio isn't working.

> When trying to play a video (with XBMC) everything stutters, but I guess
> it's just because of the A/V sync.
>
>
> I'm sorry I can't bisect that, this machine is quite heavily used so I'm
> back with the older HD2600 (but I would prefer the HD6450 to work,
> apparently it should have working multichannel sound through hdmi). And
> there are non-working kernels in the middle, and I wouldn't know where
> to start.
> But maybe I can try a few radeontool hacks or something.


Can you try with kernel 3.13?  Multi-channel pcm supported for AMD hda
chips wasn't added until 3.13 IIRC.

Alex