[Bug 15078] New: [KMS] X1300 radeon boot failure

[bugzilla-daemon@bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=15078

           Summary: [KMS] X1300 radeon boot failure
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.32.3
          Platform: All
        OS/Version: Linux
              Tree: Fedora
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: tomastrnka@gmx.com
        Regression: No


My AGP X1300 often (maybe 80% of boots) fails to boot with radeon.modeset=1. No
error messages are reported, but when the GPU is being initialized, my CRT
screen goes blank (with signal on, the monitor reports 720x400@70Hz). After a
few seconds, the machine reboots. Sometimes, instead of getting a blank screen,
irregular vertical white&black stripes are displayed (at the aforementioned
resolution).
I've used netconsole to get the dmesg output, the log ends with:
[drm] GART: num cpu pages 131072, num gpu pages 131072

I've tried to pinpoint the exact location of the problem by adding printk's
between the relevant function calls in rv515.c (tested this on
2.6.32.3-17.fc12.x86_64, but the problem is here since the birth of the
Universe). However, this made the bug disappear, as it apparently is some kind
of a race condition. Adding printk's one by one I've found that the bug is
somewhere between rv515_mc_program() and r100_rb2d_reset() in
rv515_startup/rv515_gpu_init. Inserting anything between those two function
calls makes the bug disappear.

I've tried to fiddle with various options, notably acpi=off, pci=nomsi,
radeon.agpmode=-1 and various AGP aperture sizes, with no effect.

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