[Nouveau] Regression: Blank screen with kernel 3.4

[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.

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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