lazy-bit

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Posts Tagged ‘driver problem’

Fix for Ubuntu 8.04 64bit 4gig ram and fglrx driver using mttr

Posted by lazybit on September 2, 2008

I’ve seen I’m not the only one running a 64 bit Ubuntu Hardy and running into a problem starting Xorg with the fgrlx driver when using 3+ gig of ram.

My Xorg is running (without crashes so far) for a few days now, thanks to this fix at the ubuntu forum.

I’m using a script during startup that applies the patch and then starts kdm.

Here’s the fix (as seen in the ubuntu forum, link above):

#!/bin/sh
# Fixup /proc/mtrr
echo "disable=2" >| /proc/mtrr
echo "disable=1" >| /proc/mtrr
echo "disable=3" >| /proc/mtrr
echo "disable=4" >| /proc/mtrr
echo "disable=0" >| /proc/mtrr
echo "base=0x00000000 size=0x80000000 type=write-back" >| /proc/mtrr
echo "base=0x80000000 size=0x40000000 type=write-back" >| /proc/mtrr
echo "base=0xC0000000 size=0x10000000 type=write-back" >| /proc/mtrr
echo "base=0x100000000 size=0x20000000 type=write-back" >| /proc/mtrr
echo "base=0x120000000 size=0x10000000 type=write-back" >| /proc/mtrr

I’m using a ATI 3870, and a P35 chipset.

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