[Nouveau] [Bug 98386] [NVE7] bus: MMIO write of FAULT at [ IBUS ], Pointer to {TDMS, flat panel} table invalid

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98386

--- Comment #22 from Tolga Cakir <cevelnet at gmail.com> ---
I also have this issue. Dell M3800 here, Intel Core i7-4702HQ, Nvidia Quadro
K1100M, Lynx Point PCH. As already stated earlier in this thread, this laptop's
Nvidia GPU only provides 3D acceleration, but is neither directly connected to
the screen, nor to any outputs (aka "muxless", iirc). I run Arch Linux, kernel
4.19.2.

I also get the issue:
[   21.893456] nouveau 0000:02:00.0: bus: MMIO write of 00000002 FAULT at
4188ac [ IBUS ]

This happens during boot, aswell as after resume from S3. I've noticed power
usage is higher after S3 resume, since nouveau fails to power down the dGPU. It
successfully powers down the GPU on first boot though. Doesn't happen with
bbswitch.

I've tested kernel 4.14, where this issue doesn't happen. Nouveau successfully
powers down the GPU both on first boot and on S3 resume. This seems to be a
regression.

I'm not entirely sure, if this behaviour *really* is related to the nouveau
error message. Please let me know, if there are any patches I can test or and
debug information I can provide.

Cheers,
Tolga

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/nouveau/attachments/20181121/a03113a0/attachment.html>