[Nouveau] [Bug 70875] [NVC1] NOUVEAU(0): [drm] failed to set drm interface version

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70875

--- Comment #12 from Marcin Zajaczkowski <mszpak at wp.pl> ---
I managed to build and install 3.13-rc1 with CONFIG_PM_RUNTIME on my Fedora,
but I have two issues.

1. I can't determine if NVidia card is disabled when become not used (basing on
a system temperature it's not). vga_switchero always returns DynPwr - can
vgaswitcheroo be more verbose?

$ sudo cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynPwr:0000:01:00.0

I need to build and install patched for 3.13 bbswitch version which shows:
$ cat /proc/acpi/bbswitch
0000:01:00.0 ON

and I cannot disable it using bbswitch.
bbswitch: device 0000:01:00.0 is in use by driver 'nouveau', refusing OFF

I also cannot unload nouveau driver. There is nothing more in the kernel log.

2. I tried to boot with bbswitch (then vgaswitcheroo become disabled) and a
discrete is turn off. Unfortunately and cannot tell Prime to use it for
offloading because xrandr --listproviders returns only Intel card. Even when I
manually enable discrete card and later load nouveau driver xrandr returns the
second card with modesetting instead of nouveau (can I do something in that
case?)

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