glxgears frame rate when DPMS is in "off" state

[Michel Dänzer]

On Mon, 2012-12-10 at 13:12 -0600, Ilija Hadzic wrote: 
> 
> Clearly, the behavior that we have now is wrong from the power-savings 
> perspective (i.e., it completely defeats the purpose of DPMS),

Not sure I agree with this statement, given DPMS stands for *Display*
Power Management Signaling, but whatever.


> but before I try to hack up the fix, I would like to hear some
> suggestions on what the "right" thing to do would be.

How about something like this:

If the swap can't be scheduled using a vertical blank event, because the
relevant CRTC isn't running, check if the window's swap interval has
elapsed since the last swap (using the refresh rate of the relevant
CRTC's current / last set mode). If it hasn't, suspend the client until
it has before doing the swap with a blit.


-- 
Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer