Xorg crash on HD6450

[Xavier Bestel]

Le jeudi 20 février 2014 à 08:46 -0500, Alex Deucher a écrit :
> 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.

In fact it's because I have a video projector on the hdmi connector and
an audio amplifier on the dvi connector. I guess the driver is trying to
get SAD on the videoproj, which doesn't work. When I unplug the
videoproj the message disappears.

> > 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.

Well same problem. It worked once for a few seconds, then it blocked.
And strangely enough the HD2600 doesn't work with debian's 3.13, the
sound is too slow (bad sample rate), I had to go back to 3.12.

Life of an AMD user isn't easy ...

	Xav