[Nouveau] [Bug 86537] [NV96] Unable to handle page request from nv50_crtc_prepare

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86537

--- Comment #5 from Pierre Moreau <pierre.morrow at free.fr> ---
(In reply to l3iggs from comment #4)
> I've found a workaround for this bug (tested with 3.18-rc5):
> 
> (1) Append 'modprobe.blacklist=nouveau' to the kernel boot parameters
> This allows the system to boot.
> (2) Once booted, as root, reset the 9600M GPU: 'echo 1 >
> /sys/bus/pci/devices/0000:02:00.0/reset'
> (3) 'echo 1 > /sys/bus/pci/devices/0000:02:00.0/rescan'
> (4) 'modprobe nouveau'

It does work indeed, and seems to solve some other issues related to that card
(powering it down using vgaswitcheroo, suspending the laptop - resuming doesn't
work though).

> 
> Note that 0000:02:00.0 is the PCI bus address of my 9600M GT GPU, which I
> learned by inspecting the output of lspci.
> 
> The trick here is getting the GPU into the proper state before the nouveau
> module is loaded. I've found that the internal state of the GPU can
> frequently be inconsistent across reboots making troubleshooting difficult.
> Resetting and then rescanning it before loading nouveau seems to solve
> things for every scenario I've tested.
> 
> With the above workaround I can start a display manager (GDM for gnome
> 3.14.2) and everything seems to work as expected, ex. glxgears.
> 
> The 9400M GPU can optionally be disabled between steps (3) and (4): 'echo 1
> > /sys/bus/pci/devices/0000:03:00.0/remove'
> 
> where 0000:03:00.0 is the PCI address of my 9400M.

vgaswitcheroo should be able to connect the integrated to the display (look at
http://nouveau.freedesktop.org/wiki/Optimus/) using apple-gmux driver.

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