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a60fb26
(Get the code!)
Created attachment 69265
Bisect log (Kayden)
I managed to reproduce this after all.
Steps to reproduce:
1. Enable KWin's "Show FPS" counter plugin.
2. Configure the "Present Windows" effect to one of the screen corners.
3. Mash that repeatedly and watch the FPS counter.
On HD 4000, a good version of Mesa results in perhaps ~55-60 FPS. Bad Mesa can be as low as 17 FPS, often mid-30s.
I also went ahead and bisected it (the log is attached).
e943e5c291c5f4c
commit e943e5c291c5f4c
Author: Chad Versace <email address hidden>
Date: Thu Aug 2 17:13:17 2012 -0700
intel: Advertise multisample DRI2 configs on gen >= 6
This turns on window system MSAA.
So in other words, it looks like KDE is using multisampling now, whereas it didn't before. Our implementation of that may not be optimal, and may have bugs, but it will always be far slower than single sampling.
My next question would be: how can one disable the use of MSAA in KWin or Plasma? I don't see an option for that, but I would be really surprised if there wasn't one...