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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Regression] Graphical corruption after resuming from suspend (w/ dual monitor configuration)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89980#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [Regression] Graphical corruption after resuming from suspend (w/ dual monitor configuration)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89980">bug 89980</a>
from <span class="vcard"><a class="email" href="mailto:falaca@gmail.com" title="falaca@gmail.com">falaca@gmail.com</a>
</span></b>
<pre>Based on my debugging so far, it seems that mesa is the likely culprit.
Step #1: Fresh install of Ubuntu 14.04 (installed on a new, clean partition):
Linux 3.13 kernel -> Manually upgraded to Linux 4.0 mainline
Xorg 1.15.1
Mesa 10.1.3
xf86-video-ati 7.3
libdrm 2.4.56
Status: The bug is not present, and confirms that the issue is not with the
kernel.
----------
Step #2: Installed Ubuntu 14.04.2 hardware enablement stack:
Linux 4.0 (mainline)
Xorg 1.16.0
Mesa 10.3.2
xf86-video-ati 7.4
libdrm 2.4.56
Status: The bug is present.
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Step #3: I reverted to the original 14.04 packages, but compiled xf86-video-ati
7.4 from git.
Status: The bug is not present, and confirms (?) that the issue is not with
ddx.
----------
Step #4: I had trouble getting Ubuntu to work with Mesa compiled from git
(whenever I try to log in, I just get kicked back to the lightdm greeter), and
I couldn't upgrade Mesa from the Ubuntu repo without also upgrading Xorg, so I
upgraded Mesa from Oibaf PPA:
Linux 4.0 (mainline)
Xorg 1.15.1
Mesa 10.6 (oibaf-ppa)
xf86-video-ati 7.4 (git) (also tested 7.5.99 from oibaf-ppa)
libdrm 2.4.60 (oibaf-ppa)
Status: The bug is present. So it seems likely that the bug was introduced
somewhere between Mesa 10.1.3 and 10.3.2.
If I can figure out how to get Ubuntu to play nice with mainline Mesa compiled
from git (maybe if I figure out how to apply the Ubuntu patches), I can do a
bisect, but that's where I'm stuck as of now.</pre>
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