Mesa from git 7.11-devel has a problem with the game Steel Storm episode 1
http://www.steel-storm.com/content/ - (Free)
Jerky fps when Intel graphics is selected from graphics option menu.
case 1: dark stages like first level has less jerkiness
case 2: stages with having light have most jerkiness (unplayable)
less Jerky fps when no Intel graphics is selected from graphics option menu.
case1: same as above
case2: same as above
the game were running at perfect speed with Mesa 7.8.3-rc1 and 7.9.1.
the problem is arises probably with Mesa 7.10.
Intel GMA 4500 256MB
Mesa 7.11-devel from git
bundled X.org from Ubuntu 10.10
Mesa 7.10.1 is also affected by this bug
Problem occurs only when Intel Graphics is selected from Graphics option menu.
This is a regression since Mesa 7.9 series.
Mesa 7.11-devel mesa-ef59049c5242a1be7fa59a182d342191185dd62b
As of Mesa 5c9e0ad5fddf216921703a0aa9c911a51226cdfd this is fixed.
fps is smooth when Intel Graphics is selected from Graphics Option Mesa in the game.