Comment # 3
on bug 89980
from falaca@gmail.com
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. ---------- 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.
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