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    SubjectLinux 2.4.20-pre4 blows away Xwindows with Matrox G400 and DRM
    It was OK with pre2, went straight to pre4.
    Upon running startx I get a fraction of a second of activity before
    I'm plunged into an instant reboot. Inspection of the XFree86.0.log
    shows the first and last lines as:
    XFree86 Version 4.2.0 (Red Hat Linux release: 4.2.0-8) / X Window System
    (protocol Version 11, revision 0, vendor release 6600)
    Release Date: 23 January 2002
    If the server is older than 6-12 months, or if your card is
    newer than the above date, look for a newer version before
    reporting problems. (See http://www.XFree86.Org/)
    Build Operating System: Linux 2.4.17-0.13smp i686 [ELF]
    Build Host: daffy.perf.redhat.com
    ...
    (==) MGA(0): Write-combining range (0xd8000000,0x2000000)
    (II) MGA(0): vgaHWGetIOBase: hwp->IOBase is 0x03d0, hwp->PIOOffset is 0x0000
    (--) MGA(0): 16 DWORD fifo
    (==) MGA(0): Default visual is TrueColor
    (II) MGA(0): [drm] bpp: 16 depth: 16
    (II) MGA(0): [drm] Sarea 2200+664: 2864
    drmOpenDevice: minor is 0
    drmOpenDevice: node name is /dev/dri/card0
    drmOpenDevice: open result is -1, (No such device)
    drmOpenDevice: Open failed
    drmOpenDevice: minor is 0
    drmOpenDevice: node name is /dev/dri/card0
    drmOpenDevice: open result is -1, (No such device)
    drmOpenDevice: Open failed
    <EOF>

    A good start continues on:
    drmOpenDevice: minor is 0
    drmOpenDevice: node name is /dev/dri/card0
    drmOpenDevice: open result is 7, (OK)
    drmGetBusid returned ''
    (II) MGA(0): [drm] loaded kernel module for "mga" driver
    (II) MGA(0): [drm] created "mga" driver at busid "PCI:1:0:0"
    (II) MGA(0): [drm] added 8192 byte SAREA at 0xe08e2000
    (II) MGA(0): [drm] mapped SAREA 0xe08e2000 to 0x40016000
    (II) MGA(0): [drm] framebuffer handle = 0xd8000000
    (II) MGA(0): [drm] added 1 reserved context for kernel
    (II) MGA(0): [agp] Mode 0x1f000201 [AGP 0x1106/0x3099; Card 0x102b/0x0525]

    Selection from my config:
    CONFIG_AGP=m
    # CONFIG_AGP_INTEL is not set
    # CONFIG_AGP_I810 is not set
    CONFIG_AGP_VIA=y
    # CONFIG_AGP_AMD is not set
    # CONFIG_AGP_SIS is not set
    # CONFIG_AGP_ALI is not set
    # CONFIG_AGP_SWORKS is not set
    CONFIG_DRM=y
    # CONFIG_DRM_OLD is not set

    #
    # DRM 4.1 drivers
    #
    CONFIG_DRM_NEW=y
    # CONFIG_DRM_TDFX is not set
    # CONFIG_DRM_R128 is not set
    # CONFIG_DRM_RADEON is not set
    # CONFIG_DRM_I810 is not set
    CONFIG_DRM_MGA=m

    Hardware:
    Althon 1600+ XP, Matrox G400, VIA KT266A
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