Thanks for fixmtrr.sh !!.. it solved the slow performance problems in my
Intel 945GM running Ubuntu/Kubuntu 9.04.
BTW, I am using the older xserver-xorg-video-intel-2.4.
If I use the default xserver-xorg-video-intel 2.6.3, then fixmtrr.sh fixes the
performance issues, but causes screen corruption, which can be clearly noticed
when switching windows using Alt+Tab !!
---------------------------------------------------------------------------
kernel version 2.6.28.11.15
lspci -vvnn:
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GM/GMS,
943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03)
Subsystem: Hewlett-Packard Company Device [103c:30ad]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 16
Region 0: Memory at f4600000 (32-bit, non-prefetchable) [size=512K]
Region 1: I/O ports at 4000 [size=8]
Region 2: Memory at e0000000 (32-bit, prefetchable) [size=256M]
Region 3: Memory at f4680000 (32-bit, non-prefetchable) [size=256K]
Capabilities: <access denied>
Kernel modules: intelfb
cat /proc/mtrr :
reg00: base=0x000000000 ( 0MB), size= 2048MB, count=1: write-back
reg01: base=0xf7f800000 (63480MB), size= 8MB, count=1: uncachable
reg02: base=0x0feda0000 ( 4077MB), size= 128KB, count=1: uncachable
reg03: base=0x0e0000000 ( 3584MB), size= 256MB, count=1: write-combining
--
[i915GM] MTRR entry gets removed when restarting xorg - causes corruption on
ttys
https://bugs.launchpad.net/bugs/314928
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