проблемы с nvidia xorg 4GB RAM и mtrr

Здравствуйте, не могу понять, как решить проблему с mtrr
на борту проц core2duo e8400, видео GeForce 9600 GT, 2 планки памяти по 2 ГБ

reg00: base=0x000000000 (    0MB), size= 4096MB, count=1: write-back
reg01: base=0x0e0000000 ( 3584MB), size=  512MB, count=1: uncachable
reg02: base=0x0d0000000 ( 3328MB), size=  256MB, count=1: uncachable
reg03: base=0x100000000 ( 4096MB), size= 1024MB, count=1: write-back
reg04: base=0x130000000 ( 4864MB), size=  256MB, count=1: uncachable
reg05: base=0x0cff00000 ( 3327MB), size=    1MB, count=1: uncachable

пересобрал ядро

grep -i mtrr /usr/src/linux/.config
CONFIG_MTRR=y
CONFIG_MTRR_SANITIZER=y
CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=1
CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT=1

все равно выдает

reg00: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back
reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back
reg02: base=0x0c0000000 ( 3072MB), size=  256MB, count=1: write-back
reg03: base=0x0cff00000 ( 3327MB), size=    1MB, count=1: uncachable
reg04: base=0x100000000 ( 4096MB), size=  512MB, count=1: write-back
reg05: base=0x120000000 ( 4608MB), size=  256MB, count=1: write-back

и при загрузке

[    0.000000] MTRR default type: uncachable
[    0.000000] MTRR fixed ranges enabled:
[    0.000000]   00000-9FFFF write-back
[    0.000000]   A0000-BFFFF uncachable
[    0.000000]   C0000-CCFFF write-protect
[    0.000000]   CD000-EFFFF uncachable
[    0.000000]   F0000-FFFFF write-through
[    0.000000] MTRR variable ranges enabled:
[    0.000000]   0 base 000000000 mask F00000000 write-back
[    0.000000]   1 base 0E0000000 mask FE0000000 uncachable
[    0.000000]   2 base 0D0000000 mask FF0000000 uncachable
[    0.000000]   3 base 100000000 mask FC0000000 write-back
[    0.000000]   4 base 130000000 mask FF0000000 uncachable
[    0.000000]   5 base 0CFF00000 mask FFFF00000 uncachable
[    0.000000]   6 disabled
[    0.000000]   7 disabled
[    0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
[    0.000000] original variable MTRRs
[    0.000000] reg 0, base: 0GB, range: 4GB, type WB
[    0.000000] reg 1, base: 3584MB, range: 512MB, type UC
[    0.000000] reg 2, base: 3328MB, range: 256MB, type UC
[    0.000000] reg 3, base: 4GB, range: 1GB, type WB
[    0.000000] reg 4, base: 4864MB, range: 256MB, type UC
[    0.000000] reg 5, base: 3327MB, range: 1MB, type UC
[    0.000000] total RAM covered: 4095M
[    0.000000] Found optimal setting for mtrr clean up
[    0.000000]  gran_size: 64K 	chunk_size: 2M 	num_reg: 6  	lose cover RAM: 0G
[    0.000000] New variable MTRRs
[    0.000000] reg 0, base: 0GB, range: 2GB, type WB
[    0.000000] reg 1, base: 2GB, range: 1GB, type WB
[    0.000000] reg 2, base: 3GB, range: 256MB, type WB
[    0.000000] reg 3, base: 3327MB, range: 1MB, type UC
[    0.000000] reg 4, base: 4GB, range: 512MB, type WB
[    0.000000] reg 5, base: 4608MB, range: 256MB, type WB

также при загрузке ошибки

[    4.022713] nvidia: module license 'NVIDIA' taints kernel.
[    4.022717] Disabling lock debugging due to kernel taint
[    5.327321] nvidia 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[    5.327325] NVRM: Can't find an IRQ for your NVIDIA card!
[    5.327347] NVRM: Please check your BIOS settings.
[    5.327348] NVRM: [Plug & Play OS] should be set to NO
[    5.327349] NVRM: [Assign IRQ to VGA] should be set to YES 
[    5.327353] nvidia: probe of 0000:01:00.0 failed with error -1
[    5.327386] NVRM: The NVIDIA probe routine failed for 1 device(s).
[    5.327387] NVRM: None of the NVIDIA graphics adapters were initialized!

в xorg вот эта фраза тоже не очень нравится

 NVIDIA: Using 768.00 MB of virtual memory for indirect memory access.

Вобщем не знаю, с чего начинать, подскажите, куда копать, может поиграться с параметром CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT, не хватает знаний, буду признателен, если кто-то посоветует годную статью, книжку по теме
Xorg.log
dmesg