Re: [PATCH] drm/radeon: Fix regression with suspend/resume

[Christian KÃnig]

On 22.02.2015 00:18, Ross Zwisler wrote:
> On Wed, 2015-02-18 at 13:02 +0100, Christian KÃnig wrote:
> > Well, what the patch does is just changing where buffers are placed in
> > memory. E.g. now we place the buffer at the end of memory as well.
> >
> > So I can imagine at least three possible causes for the issues you see:
> > 1. We haven't implemented all buffer placement restrictions correctly
> > and without the patch everything just works fine by coincident.
> > 2. Something is overwriting the buffer at it's new location.
> > @Alex&Michel: Didn't we had a similar problem internally recently? Or
> > was that just for APUs?
> > 3. One of the memory chips on your hardware is faulty and without the
> > patch the we just don't use the affected region (rather unlikely).
> >
> > For testing could you try to limit the amount of VRAM used? E.g. give
> > radeon.vramlimit=256 as kernel commandline to limit the VRAM to the
> > first 256MB.
> Tried with the kernel parameter radeon.vramlimit=256, and it seemed to have
> the exact same behavior.  The flicker was still there, same size, same
> frequency.

Well how much memory does the card have in the first place? 256MB was 
just an example.

Please provide a complete dmesg output with that paramater.

Regards,
Christian.

> Thanks,
> - Ross

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