I also had the same problem with a Dell Optiplex 755 with a Radeon HD
2400 Pro when using 4gb of memory on an amd64 (x86_64) install of
RHEL5.2. Disabling mtrr in the xorg.conf and disabling redhat's
graphical boot seemed to do the trick. I'd like the pretty graphics on
boot so users aren't exposed to that, but I can live without it. So my
changes in sudo diff format:
/etc/sysconfig/init:
- GRAPHICAL=yes
+ GRAPHICAL=no
/etc/X11/xorg.conf:
Section "Device"
- Option "mtrr" "off" # This would use fglrx's own mtrr mapper code
+ Option "mtrr" "on" # Instead let the system handle it
Option "no_accel" "no" # but keep accelleration
Option "no_dri" "no" #and dri
EndSection
--
MTRR is not properly setup on Intel Northbridge Chipset (P35, X38, X48) with
more than 3GB RAM and with Memory Remapping Enabled
https://bugs.launchpad.net/bugs/224404
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