[Bug 38131] Re: Firefox causes massive Xorg CPU usage

[Neil Broomfield]

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.

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Firefox causes massive Xorg CPU usage
https://bugs.launchpad.net/bugs/38131
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