" Option "RandRRotation" "boolean"
Enable rotation support for the XRandR extension. This
allows use of the XRandR X server extension for
configuring the screen orientation through rotation.
This feature is supported on GeForce2 or better hardware
using depth 24. This requires an XOrg 6.8.1 or newer
X server. This feature does not work with hardware overlays,
emulated overlays will be used instead at a substantial
performance penalty. See APPENDIX W for details.
Default: off."
Testing with the nvidia driver confirms that even for the non-rotated case the
overlay is not used (when the above option is set), so it would seem falling
back to blitter is the answer.
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