Comment 54 for bug 43154

Just wanted to say I have a Via Epia CLE266/M10000 motherboard and have run into the same on gentoo.

As such I have a few observations that may or may not help:
The issue appears to have started after upgrading to libdrm-2.3.0 from libdrm-2.0.2 or earlier.
x11-drm module dated 20060608 works for 2d, however after running one XV window, say under mplayer, the second segfaults the X server. OpenGL programs like Quake3 work fine fullscreen, although windowed GL apps like secondlife create artifacting outside of their window (offset down and to the right by about 1/4 of the image size.

x11-drm 20070314 is actually worse, xdm when started doesn't show the text boxes on the login page, although actual username and password typing works. Once in a windowmanager initial xterms will show up, but rather than having their text window visible they 'show through' to the desktop, which stays checkerboarded and doesn't load any background images. Furthermore exiting/CTRL-ALT-BKSPing the X session causes a hard lock when the next X server attempts to initialize.

Given these issues I'm reverted to libdrm-2.0.2 to determine if that solves my issues, and if not, also reverted to the 2005 era via drm modules. If both these solutions fail then I'll have run out of details I changed between when 3d/Xv was working fine, and now.

Best of luck to the rest of you and hopefully some developers can be found who'd be willing to look into the issue.