Comment 19 for bug 1162026

Yes, Ubuntu 12.04 does not have this issue.

Actually, I see that 3.9-rc5 was released yesterday, and it contains this change:
Revert "drm/i915: write backlight harder"
http://permalink.gmane.org/gmane.linux.kernel.commits.head/372554

Right now, someone else is using the L322X I was testing with, so I can't check rc5 at the moment.