2.6.27-rc1 mtrr fixes do not work

[Alexander Huemer <alexander.huemer@sbg.ac.at>]

hi,

mtrr is wrong on my machine. the fixes of 2.6.27-rc1 do not seem to work.
bios is the newest version, mainboard vendor says it's not their fault.
mainboard is tyan i5000pw.
please tell me how i can help and cc me on answers, i am not subscribed.

here is some data:

seaburg ~ # grep -E "(^\(WW\)|^\(EE\)|^\(NI\)|^\(??\))" /var/log/Xorg.0.log
(WW) VESA(0): Failed to set up write-combining range (0xd8000000,0x2000000)
seaburg ~ # dmesg|grep mtrr
Command line: root=/dev/sda1 video=uvesafb:1280x1024-24@97,mtrr:3,ywrap 
mtrr_gran_size=64m mtrr_chunk_size=1024m
Kernel command line: root=/dev/sda1 
video=uvesafb:1280x1024-24@97,mtrr:3,ywrap mtrr_gran_size=64m 
mtrr_chunk_size=1024m
mtrr: type mismatch for d8000000,800000 old: write-back new: write-combining
mtrr: type mismatch for d8000000,400000 old: write-back new: write-combining
mtrr: type mismatch for d8000000,200000 old: write-back new: write-combining
mtrr: type mismatch for d8000000,100000 old: write-back new: write-combining
mtrr: type mismatch for d8000000,80000 old: write-back new: write-combining
mtrr: type mismatch for d8000000,40000 old: write-back new: write-combining
mtrr: type mismatch for d8000000,20000 old: write-back new: write-combining
mtrr: type mismatch for d8000000,10000 old: write-back new: write-combining
mtrr: type mismatch for d8000000,8000 old: write-back new: write-combining
mtrr: type mismatch for d8000000,4000 old: write-back new: write-combining
mtrr: type mismatch for d8000000,2000 old: write-back new: write-combining
mtrr: type mismatch for d8000000,1000 old: write-back new: write-combining
mtrr: type mismatch for d8000000,2000000 old: write-back new: 
write-combining
seaburg ~ # cat /proc/mtrr
reg00: base=0x00000000 (   0MB), size=198656MB: write-back, count=1
reg01: base=0x80000000 (2048MB), size=197632MB: write-back, count=1
reg02: base=0x100000000 (4096MB), size=197632MB: write-back, count=1
seaburg ~ # grep MemTotal /proc/meminfo
MemTotal:      4041308 kB
seaburg ~ # lspci -v | grep -A10 VGA
20:05.0 VGA compatible controller: XGI Technology Inc. (eXtreme Graphics 
Innovation) Volari Z7 (prog-if 00 [VGA controller])
        Subsystem: XGI Technology Inc. (eXtreme Graphics Innovation) 
Volari Z7
        Flags: 66MHz, medium devsel
        BIST result: 00
        Memory at d8000000 (32-bit, prefetchable) [size=64M]
        Memory at dc300000 (32-bit, non-prefetchable) [size=256K]
        I/O ports at 3000 [size=128]
        Capabilities: [40] Power Management version 2

seaburg ~ # zcat /proc/config.gz | grep MTRR
CONFIG_MTRR=y
CONFIG_MTRR_SANITIZER=y
CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=1
CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT=1
seaburg ~ # uname -a
Linux seaburg 2.6.27-rc1-blackbit #3 SMP Wed Aug 6 00:34:51 CEST 2008 
x86_64 Intel(R) Xeon(R) CPU E5420 @ 2.50GHz GenuineIntel GNU/Linux
seaburg ~ #