View Full Version : [kubuntu] Radeon HD 5650 gets VERY slow after enabling compositing in KDE

September 3rd, 2010, 08:42 PM

I have a laptop with the radeon HD 5650 video card. I used ubuntu's hardware drivers program to install the official drivers, and it seems to be working well, including 3D acceleration in games. However, it seems that enabling compositing in KDE makes it much slower. For example, running glxgears without compositing gives me about 35000 frames in 5 seconds, after I enable compositing it's only 6000 frames. But it's not just glxgears, the slowness is very noticeable in games as well.

On my old computer, I had an nVidia card, and enabling compositing in KDE made it a little slower, but the difference definitely wasn't that huge. o_O Is it some wrong configuration, a bug in ATI's drivers, or something else?

September 5th, 2010, 08:39 PM


September 5th, 2010, 08:49 PM
I used ubuntu's hardware drivers program to install the official drivers

They might be "official" as you say, but they are outdated, almost 3 or 4 versions outdated now. All I can suggest is trying the more upto date drivers from the ATi site.

ATi have a monthly cycle on drivers, whilst ubuntu as like a 6month cycle with each new ubuntu release.

September 7th, 2010, 10:29 AM
Thanks for the reply! I think I'll just learn to live without compositing until the next Ubuntu version... it's a good thing that KDE is pretty even without it :D I don't really want to mess up my Ubuntu installation by installing stuff outside the package manager.