This chapter demonstrates how to rotate the screen in 90 degree increments using hardware acceleration.
To enable the rotation, add the option Rotate in Section "Monitor".
Option "Rotate" "string"
The valid string could be left, right, normal, inverted. And the corresponding rotation degree is 270, 90, 0, 180 (CW). The default value is normal.
Notes: now driver only support EXA+RandR and XAA+no-RandR rotation, so if you want to RandR rotate you must configure the xorg.conf for RandR path. Then driver will choose the EXA path automatically.
To enable EXA architecture, X.Org 6.9/7.0 or above is required.
When EXA is enabled, the video memory in BIOS setting should be larger than 64M.