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    SubjectRe: AGP and PAT (induced?) problem (on AMD family 6)
    On Mon, Aug 04, 2008 at 06:30:32PM +0200, Rene Herman wrote:
    > What _does_ solve this though is booting with the "nopat" command line
    > parameter. I'm on 2.6.26.1 and have enabled PAT for my AMD Duron myself.
    > With "nopat", there's no problem to be seen anymore -- exiting X
    > specifically is instantaneous.
    >
    > With or without PAT, my /proc/mtrr is always:
    >
    > reg00: base=0x00000000 ( 0MB), size= 512MB: write-back, count=1
    > reg01: base=0x20000000 ( 512MB), size= 256MB: write-back, count=1
    > reg02: base=0xe8000000 (3712MB), size= 64MB: write-combining, count=1
    >
    > under X joined by:
    >
    > reg03: base=0xe4000000 (3648MB), size= 32MB: write-combining, count=2

    To get some more debug data, can you please retest with latest kernel
    (2.6.27-rc2) using "debugpat" kernel option and provide dmesg
    output plus contents of <debugfs>/x86/pat_memtype_list?


    Thanks,

    Andreas




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