Comment 296 for bug 252094

About 2 months ago I was able to get the same performance as it was in Hardy by the following steps:

> 1. install a 2.6.28 kernel (I got the current one from jaunty).
> 2. from the xorg-edgers ppa, install the mesa an required packages, and xserver-xorg-video-intel 2:2.4.97.0+git20081129

Today I've decided (I blame myself for that) to upgrade from xorg-edgers ppa and hope to get more stable driver and some rendering issues fixed, but unexpectedly got 45% regression:

glxgears: 1100fps -> 600fps
Planet Penguin Racer (ppracer): 40fps -> 22fps on 1440x900x32

So since I'm running on GEM-enabled kernel/driver/xserver why we again get huge regression after several months of work?
What exactly doesn't allow to keep performance at least on xserver-xorg-video-intel 2:2.4.97.0+git20081129 level?

Alter attempt to upgrade video-related packages to Jaunty versions things become more horrible:
glxgears: 600fps -> 50fps

I even didn't try to run ppracer, since regression in compiz performance was eye-sensible (I had to wait 5-7 sec to switch between windows via Ring/Shift Switcher plugins). Maybe it's due to turned on/off vblank_mode, but I don't know how to change it globally for all programs, including compiz.

PS.
I can't downgrade to xserver-xorg-video-intel 2:2.4.97.0+git20081129.
Log of upgraded packages (with versions) attached.