Nouveau - Oct 2015 - [Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with X server 1.18 with rotated output

https://bugs.freedesktop.org/show_bug.cgi?id=92271

--- Comment #22 from Adam Williamson <adamw at happyassassin.net> ---
So...yeah, it more or less works with a current git snapshot, except there's
one odd thing...I have a file in /etc/X11/xorg.conf.d with this content:

Section "Device"
        Identifier  "nouveau"
        Driver      "nouveau"
        Option    "Monitor-DVI-I-1"    "Right Monitor"
    Option    "Monitor-DVI-I-2"    "Left Monitor"
EndSection

Section "Monitor"
    Identifier    "Left Monitor"
    Option    "Primary"    "True"
    Option    "Rotate"    "left"
EndSection

Section "Monitor"
    Identifier    "Right Monitor"
    Option    "RightOf"    "Left Monitor"
        Option  "Rotate"        "left"
EndSection

it's to rotate my screens on desktops that don't do their own RandR
stuff (and
it used to work for GDM too, doesn't any more). But for some reason, if I
have
that file active with latest git nouveau, X won't start; I have to rename it
to
.conf.bak to make X start. Still, if I do that, it does run fine and at full
speed, so this one looks like a bug tied to the particular nouveau DDX git
snapshot Fedora is using. Guess I should move it downstream?

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