[Bug 27501] MacBook Pro 5, x unable to boot [NV96 + NVAC]

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

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https://bugs.freedesktop.org/show_bug.cgi?id=27501

--- Comment #44 from Pierre Moreau <pierre.morrow-GANU6spQydw@public.gmane.org> ---
(In reply to thomas from comment #43)
> (In reply to Pierre Moreau from comment #42)
> > Created attachment 107262 [details] [review] [review]
> > Fix acceleration on 9400M v2
> > 
> > Here is an updated version of the patch.
> > 
> > Thomas,
> > Do you still get screen corruption with it? (I can't reliably reproduce the
> > screen corruption unfortunately.)
> > GDM seems to work fine on my laptop with only 9400M having acceleration
> > enabled. I'll try with 9600M GT acceleration enabled too. :/
> 
> Hi Pierre,
> 
> I've applied your v2 patch and the results are similar. The 9400M works
> correctly. GDM loads fine, but it won't start a gnome-shell session.
> However, SLIM works correctly and is able to load both gnome-shell and
> Awesome. I'm writing this from gnome-shell now, and performance is good. I
> haven't had any screen corruption with the 9400M. I'll use this
> configuration for now and report any issues I encounter.
> 
> The 9600M GT (acceleration disabled) still has corruption in VT as before,
> but this time the screen blanks when X is loaded.

Hi Thomas,

Good to hear you can use gnome-shell! :)

By
> I haven't had any screen corruption with the 9400M.
do you mean with the 9600M GT completely disabled?

When using the 9600M GT without acceleration, do you have screen corruption in
VT each time? If so, could you try to modify the patch a bit, like:
- removing the write to 0x100c1c;
- if removing the write doesn't work, changing the offset applied to
priv->r100c08 maybe testing all 4-multiples should do it, from 0 to 28.

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