Comment 130 for bug 38131

A bit more background info for anyone who’s interested:

After more digging there seems to be a number of bug call specifically relating to the issue with multiple users that I’m experiencing, some of the threads suggest it’s an issue with the first session locking the DRI/DRM and as such when a seconds user logs in they cannot access the DRM and hence they drop back to software rendering. One thread suggests that “drm multi-master” support was required to successfully allow multiple users to access the DRM.

Anyway I decided to turn on Kernel Mode Setting and this seams to have allow both uses to access DRM according to glxinfo and X logs and GDM logs. Unfortunately this presents further issues, one is the fact that the Mode lines aren’t detected correctly and I’ve lost a number of resolutions settings that were available under X control (not a huge issue, but slightly annoying). The other is that Xorg now uses high CPU for a single user or multiple users, especially noticeable under Firefox (3.5). Playing videos however seems fine.

I’ve added ‘Option "RenderAccel" "true"’ and ‘Option "AccelMethod" "exa"’ to my xorg.conf, same problem.