Kernel 2.6.33.2 oopsing and freezing at boot with modeset=1

[Marc Haber]

Hi,

I have just filed Linux kernel Bug #15736
(https://bugzilla.kernel.org/show_bug.cgi?id=15736) regarding a
oops&freeze  of Kernel 2.6.33.2 when booted with modeset=1 on a system
having a RV350 [Mobility Radeon 9600 M10].

The last lines of kernel output before the oops are:
[   12.501727] Linux agpgart interface v0.103
[   12.574951] [drm] Initialized drm 1.1.0 20060810
[   12.670625] [drm] radeon kernel modesetting enabled.
[   12.730384] ACPI: PCI Interrupt Link [C0C1] enabled at IRQ 10
[   12.799058] radeon 0000:01:00.0: PCI INT A -> Link[C0C1] -> GSI 10 (level, low) -> IR
[   12.900102] [drm] radeon: Initializing kernel modesetting.
[   12.968061] [drm] register mmio base: 0x90400000
[   13.023221] [drm] register mmio size: 65536
[   13.073585] [drm] GPU reset succeed (RBBM_STATUS=0x00000140)
[   13.141231] [drm] Generation 2 PCI interface, using max accessible memory
[   13.222395] BUG: unable to handle kernel NULL pointer dereference at 00000040
[   13.226373] IP: [<f81c082b>] radeon_agp_init+0x19/0x2cf [radeon]
[   13.226373] *pde = 00000000
[   13.226373] Oops: 0000 [#1] PREEMPT SMP

The kernel bug report also has full kernel output from boot up to and
including the full oops.

Does anybody here have an idea whether I am doing something wrong or
what I can do to help fixing this issue?

Greetings
Marc

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