I have seen the following issues for several months now and it started rather suddenly and thus far I was not able to figure out what was causing it:
Scrolling in GTK+(2/3) applications is sluggish, meaning: One can see fractions of the redraw happening. This is not related to smooth scrolling or tearing. I am talking about scrolling by a or several full pages. This is rather irritating while one is working. Best examples where this can be seen in action: Eclipse 4.x and Emacs 24.3.x - either GTK2 or GTK3.
Today, after some fortunate coincidence, I realized the following: This is absolutely only an issue when the card is in the lowest performance level. That also explains why the issue was not 100% reproducible all the time. If I put the card in performance mode or stick it to some specific performance level, everything is fine and the issue is gone.
This is a GTX470 and the lowest performance level is 50 MHz/135Mhz/101/MHz. Scrolling in either of the two applications, does not trigger a ramp up to the next performance level.
All of this is tested up to driver version 325.08 by the way. It does not matter of compositing is active, or whether I use KDE 4.10.5 (my main desktop) or XFCE.
Here my question:
Can I somehow keep the adaptive power governor while barring the lowest level from ever being used?
Can I somehow adjust the sensitivity of the governor to ramp up to a higher performance level earlier?
Sticking the card to a specific performance level or evening keeping it at max performance, is not really a nice solution after all. :(
Thanks in advance…