[Nouveau] Regression: Blank screen with kernel 3.4

[Ben Skeggs]

Am Samstag, 16. Juni 2012 schrieb Karol Babioch :

>
> Hi,
>
> there seems to be a quite serious regression in kernel 3.4, at least for
> me. As soon as the nouveau module gets loaded my screen goes blank.
>
> There is already a bug reported on this issue in your bug tracker, see
> [1]. Interestingly enough I've got nearly the same laptop as the
> reporter of the issue. Personally I've got a Sony VAIO VPCS12C5E. The
> reporter got a VPCS11C5E. We both have a dedicated graphics card (NVIDIA
> GeForce 310M). The CPU does provide its own GPU, but it is disabled,
> which can't be accessed or changed within the BIOS.
>
> It worked fine for kernels 2.6.39 up until now (3.3). I'm not quite sure
> whether 2.6.38 worked, or not, but it was somewhere around this time
> that it got fixed.
>
> From reading various threads, I've got the feeling that a lot of the
> black/blank screen issues should be fixed with 3.4. My best guess would
> be that something was changed, which introduced this kind of regression.
>
> As there are already some logfiles provided within the bug issued in
> your tracker (see [1]), I won't attach anything here. But I'm happy to
> provide anything you need, of course. Just let me know.

Thanks!  I'm aware of the issue and will look into it after the weekend. I
don't have any effected hw, so i'll ping you for testing as needed :)

Ben.

>
> Would be nice, to narrow this one down, as I would like to use kernel
> 3.4 and later at some point in the future ;).
>
> Best regards,
> Karol Babioch
>
> [1] https://bugs.freedesktop.org/show_bug.cgi?id=50175
>
>
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