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

From: Ross Zwisler
Date: Sat Feb 21 2015 - 18:18:36 EST

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

- Ross

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