[Nouveau] [Bug 108500] Crash when creating a depth buffer on GeForce 320M

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108500

--- Comment #9 from Timo Wiren <timo.wiren at gmail.com> ---
(In reply to Ilia Mirkin from comment #8)
> Could you edit
> drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmnv50.c:nv50_vmm_valid, and change
> it to set aper = 0 in the if (ram->stolen) case (so aper=0 in both of the
> VRAM cases).

I tested it on kernel 4.18.16 and it caused a crash/hang on bootup. Some of the
log messages (copied by hand):

nouveau 0000:04:00.0: fb: trapped read at 015bc9dedc on channel 2 [0fba0000
DRM] engine 05 [PFIFO] client 08 [PFIFO_READ] subclient 00 [PUSHBUF] reason
0000000b [PT_NOT_PRESENT]
nouveau 0000:04:00.0: fifo: DMA_PUSHER - ch 2 [DRM] get 015c25a7a4 put
015c25a7a4 ib_get 000000a2 ib_put 000000a7 state a0000000 (err: IB_EMPTY)
nouveau 0000:04:00.0: DRM: GPU lockup - switching to software fbcon
nouveau 0000:04:00.0: fb: trapped write at 0100131fc0 on channel -1 [0fedf000
unknown] engine 06 [BAR] client 04 [PFIFO_WRITE] subclient 01 [IN] reason
000000b [VRAM_LIMIT]

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