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    Subject[PATCH] Use MTRRs by default for vesafb on x86-64

    x86-64 cannot call the 32bit VESA BIOS. This means when vesafb is active
    it does software copying in the vesa frame buffer. This is insanely slow
    when the frame buffer is not marked for write combining.

    Some discussion showed that the use_mtrr flag was only off for some
    old broken ET4000 ISA card. x86-64 has no ISA, so this is no concern.
    Make the default depend on CONFIG_ISA.

    Patch for 2.5.69. Originally suggested by Gerd Knorr.


    --- linux/drivers/video/vesafb.c 2003-05-08 04:52:58.000000000 +0200
    +++ linux-2.5.69-amd64/drivers/video/vesafb.c 2003-05-15 16:55:51.000000000 +0200
    @@ -51,7 +51,11 @@
    static u32 pseudo_palette[17];

    static int inverse = 0;
    +#ifndef CONFIG_ISA
    +static int mtrr = 1;
    static int mtrr = 0;

    static int pmi_setpal = 0; /* pmi for palette changes ??? */
    static int ypan = 0; /* 0..nothing, 1..ypan, 2..ywrap */

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