[Nouveau] Fixes and workarounds for regressions and issues in the randr-1.2 branch

[Bernhard Kaindl]

Hi,
    Please find attached the patches which I currently use on my desktop
machine for dual head with the randr branch to fix the issues which I found.

They may help others as well but may e.g. also disable the Xv blitter
which might be working for some (but didn't on my card) - more information
is found in the text comments in the patches.

I have to hurry so this is short, will be back.

cu,
Bernhard Kaindl
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