Ubuntu
xorg-server package

  1. Bug #19711
  2. Comment #17

Comment 17 for bug 19711

Revision history for this message
In , Michel-tungstengraphics (michel-tungstengraphics) wrote :

Switching everything DRI to MMIO would be an awful lot of work, I don't think
that's worth it. Originally, the radeon driver used to switch to MMIO on the fly
for 2D, but that caused instabilities, so it was changed to use the CP
exclusively when the DRI is enabled. This also allows accelerating more 2D
operations and yields slightly better performance for some of the others.

Even so, it might be possible to tweak the driver such that this issue can be
avoided and power saving states entered when the X server is idle. But again,
that requires knowing exactly what prevents that right now.