Hi, I noticed a regression in the next-20140903 kernel that was not present in next-20140902. When Xorg starts up, the display is garbled (or contains old image bits) and I see a page fault in the kernel log. X is not usable in this state - there is no pointer and gdm doesn't come up. It works fine after Xorg (gdm3) is restarted. The fault is still present in next-20140918.
[drm] Initialized nouveau 1.2.0 20120801 for 0000:01:00.0 on minor 0 nouveau E[ PFIFO][0000:01:00.0] read fault at 0x0001260000 [PAGE_NOT_PRESENT] from PGRAPH/GPC0/TEX on channel 0x001fcd1000 [Xorg[3874]] nouveau E[ PFIFO][0000:01:00.0] PGRAPH engine fault on channel 2, recovering... nouveau E[ PGRAPH][0000:01:00.0] TRAP ch 2 [0x001fcd1000 Xorg[3874]] nouveau E[ PGRAPH][0000:01:00.0] GPC0/TPC0/TEX: 0x80000041
My hardware is: NVIDIA Corporation GF119 [Quadro NVS 4200M] (rev a1)
I bisected it down to this commit:
commit 29ba89b2371d466ca68973525816cf10debc2655 Author: Maarten Lankhorst maarten.lankhorst@ubuntu.com Date: Thu Jan 9 11:03:11 2014 +0100
drm/nouveau: rework to new fence interface
Signed-off-by: Maarten Lankhorst maarten.lankhorst@canonical.com Acked-by: Ben Skeggs bskeggs@redhat.com
I tried tracing the DEVICE, PGRAPH, PFIFO & PCE0 engines but nothing obvious stood out before the read fault shown above.
Is there any other information I can provide to help track this down? paranoia or spam level logging, for example?