[Nouveau] [Bug 58556] MacBook Pro 5, 1 with nVidia 9400m and 9600m, scrambled screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58556

--- Comment #9 from Joanand <MacGyver031 at web.de> ---
(In reply to comment #7)
> Hi Joanand
Hi Emil

> "Worked" with our without acceleration ?

With GPUPWR, the discrete (nVidia 9600M GT) was no longer available. And as
nouveau works with 9400 and acceleration, it worked with acceleration.

> Did you had the chance to narrow down what caused the change (<3.4.9 vs
> 3.7.1) ? It may be due to nouveau, vgaswitcheroo and/or other kernel driver

3.4.9 did not have a viable vgaswitcheroo, but 3.7+ did. GPUPWR did no longer
help, as vgaswiteroo reactivated 9600m. So the sole solution was to use the
nouveau driver without acceleration.

> 
> There has been a brief discussion what is the best way to handle this
> (passing nouveau params to specific card, disabling certain card etc.)
> although implementation may be far off ;(
> 
> Meanwhile add a hack for your card by checking the PCI and returning early
> rather than initialising the card - not sure which location is better
> nouveau_drm_probe or nouveau_drm_load. Keep in mind to keep is symmetric
> (ie. handle the case in nouveau_drm_remove/nouveau_drm_unload)
> 
> Your code will look something similar to
> 
> if ((pdev->bus == xx) &&
>     (pdev->dev == xx) &&
>     (pdev->func == xx)) {
>       return 0; // you can also try return -E*
> }
> 
> Cheers
> Emil

Thanks for these pointers. I will try this hack on 3.10.2. I will report if I
get any further.

BR
Joanand

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