Fedora 10 + Intel 945 poor GL performance

[Steve Hill]

I've just reinstalled my Fedora 8 notebook with Fedora 10.  An Intel 
Core2 machine with an Intel 945 graphics card:

00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 
943/940GML Express Integrated Graphics Controller (rev 03)

The performance of Compiz has hit rock bottom - with wobbly windows turned 
on, dragging a window is sloooow, with the window lagging behind the mouse 
pointer by a good few seconds.  Turning wobbly windows off at least makes 
it usable, but windows being dragged still lag behind the mouse quite a 
lot.

Also, Stellarium's performance (running without Compiz) is pretty abysmal, 
giving me under 2 frames per second and causing the whole of X to run 
cripplingly slowly.  It doesn't seem to be using much CPU time so I guess 
it hasn't done something crazy like rendering in software (and frankly I'd 
expect software rendering to be faster than this anyway).

Since both Compiz and Stellarium are showing bad performance, I suspect a 
GPU driver problem.  There are a few errors reported in the Xorg log - not 
sure if they are related:

(II) intel(0): Attempting memory allocation with tiled buffers.
(EE) intel(0): Failed to set tiling on front buffer: rejected by kernel
(EE) intel(0): Failed to set tiling on back buffer: rejected by kernel
(EE) intel(0): Failed to set tiling on depth buffer: rejected by kernel
(II) intel(0): Tiled allocation successful.

(II) intel(0): EDID for output TMDS-1
(II) intel(0): EDID for output TV
(EE) intel(0): underrun on pipe B!
(II) intel(0): EDID for output VGA
(II) intel(0): EDID for output LVDS

Any help would be appreciated.

  - Steve
    xmpp:steve at nexusuk.org   sip:steve at nexusuk.org   http://www.nexusuk.org/

      Servatis a periculum, servatis a maleficum - Whisper, Evanescence