[Bug 68571] GPU lockup on AMD Radeon HD6850 with DPM=1

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https://bugzilla.kernel.org/show_bug.cgi?id=68571

--- Comment #35 from kilobug@xxxxxxxxxxx ---
So, I finally could perform some tests. Two notes first :

1. Meanwhile I upgraded to Mesa 10.1.0.

2. The patch seemed to be already included in the drm-fixes-3.14 branch, so I
just tested with the latest version of that branch.

Now the tests themselves :

1. With dpm=0 and hyperz enabled, the drm-fixes-3.14 branch is stable.

2. With dpm=1 and hyperz enabled on Mesa 10.1, both the drm-fixes-3.14 and the
vanilla 3.13 would freeze at boot (when loading the display manager, lightdm).

3. With dpm=1 and hyperz disabled, they would work for a while, but as
initially described on this bug, after a while they freeze or lockup. The most
secure way I found to trigger a freeze is to play a HD movie using the "gl"
output of mplayer, with that, it freezes in a few minutes.


@Mihai : I'm uploading my build of the drm-fixes branch (which I wrongly named
drmnext, but it's really the drm-fixes branch... sorry, but I didn't rebuild it
just to fix the name...) on http://kilobug.net/debian it's for Debian not for
Ubuntu but it *should* work on Ubuntu too.

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