https://bugzilla.kernel.org/show_bug.cgi?id=68571
--- Comment #35 from kilobug@kilobug.org --- 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.