[Bug 39498] nouveau hangs on unresponsive black screen at startup

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

https://bugs.freedesktop.org/show_bug.cgi?id=39498

--- Comment #11 from Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2011-07-24 12:25:34 PDT ---
(In reply to comment #9)
> Emil, I tried following your advice, using the original driver which comes with
> kernel 3.0.0-git3 but the problem is still there (it gets stuck on an
> unresponsive black screen which only displays a small underscore "_" in the top
> left corner and I do not get the gdm greeter).
If you are starting at runlevel 3 there will be no kdm/gdm/xdm greeter

Thus I take that the display is _not_ black but there is still nothing relevant
on it

> ....
> [drm] nouveau 0000:01:00.0: Pointer to BIT loadval table invalid
> 
AFAIK the above message is not crucial

There are a few things you can try - all without loading X

1. Play with the module options "noaccel" and/or "nofbaccel" (modinfo nouveau
for more info)

2. Select different resolution - append "video=..." [1] to your kernel command
line

3. Add some printf() statements in the kernel module to narrow in which state
the issue occurs

Cheers
Emil

[1] http://nouveau.freedesktop.org/wiki/KernelModeSetting - Forcing Mode

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