[Nouveau] [Bug 100423] MMIO read of 00000000 FAULT at 022554 [ IBUS ]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100423

--- Comment #11 from Alex <alex-kas at privatecyberspace.net> ---
Hi folks,
I have the very similar issue about drm, bus read FAULT, etc. However, my
problem is more severe than just red lines in dmesg.

I have ideapad 700 with HD Graphics 530 as the integrated and GeForce GTX 950M
as the discrete card. I sit on gentoo with Linux-4.15.1.
The first point is that if I use nvidia drivers than my brightness buttons do
not work (not visible for anything). Summing this up with the total no need of
a powerful graphics I decided to go to the bumblebee just in case I will indeed
need a better gpu in action. That is to fire up the discrete card on demand.

My problem is that upon starting some glx-aware program at the moment when
bumblebee is trying to start a separate hidden X server with nouveau as the
driver my primary X server restarts.
After this restart and in attempt to run some glx-aware program again I see X
errors and nothing good. They boil down to the fact that drm cannot ecquire an
access to card0 and card1 because of permission issues. Well, the primary X
server now does not restart though.

I tried all what bumblebee guys suggest - no way. Also, everything is smooth
with the nvidia driver in this config.

I think it is those red messages in dmesg are the primary indicator of my
troubles.

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