Ubuntu
linux package

  1. Bug #1189645
  2. Comment #16

Comment 16 for bug 1189645

Revision history for this message
Alan Pater (alan-pater) wrote : Re: General lag under desktop environments

Looks like a UXA versus SNA problem.

   https://wiki.ubuntu.com/X/Testing/IntelSNA

~$ grep "SNA init" /var/log/Xorg.0.log
[ 47.176] (II) intel(0): SNA initialized with gen3 backend

The default is SNA, which is fast, until something goes wrong, then it gets really slow.

If I start with UXA, it is slow from the beginning.

I assume that under 12.10, intel graphics was using UXA, and performance was reasonable.
Under 13.04, UXA is unusable. SNA is fast, but unstable.