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[Pierre Monlong <pierre.monlong@xxxxxxx>]

Sorry for the time to answer

See above the result of my last tests

-2.4 intel driver from the x-retro repository (xserver-xorg-video-intel-2.4_2.4.1-1ubuntu11~ppa1_i386.deb) => OK works, good perf
-acpi=off boot option => OK works but poors performances (i don't know why)
-nomodeset boot option => KO freezes quickly after X startup
-"options i915 modeset=0" in /etc/modprobe.d/i915-kms.conf => KO freezes quickly after X startup (normal i think it's the same conf as previous)
-option "DRI" "Off" in xorg.conf => KO freezes quickly after X startup
-Option "PM" "Off"  in xorg.conf => KO freezes quickly after X startup
-Option "NoMTRR" in xorg.conf => KO freezes quickly after X startup

i don't try because ignoreby drivers version > 2.8 :
Option "AccelMethod" "xxx" - Try "XAA", "EXA" (ignored on -intel > 2.8.0)
Option "Accel" "Off" - turns off the 2D acceleration (ignored on -intel except for i810 and i815 chipsets) 


Thanks

-- 
[i855] Karmic / i855GM / Fujistu Siemens Amilo M7400 :  Freeze shortly after X startup on Intel i855
https://bugs.launchpad.net/bugs/477972
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which is the registrant for xf86-video-intel.