[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 #4 from l3iggs <j at greyltc.com> ---
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'

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.

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