[gentoo-user] Re: Extraordinarily laggy UI, keyboard, udev weirdness, KDE 4.5

[Nikos Chantziaras <realnc@arcor.de>]

On 08/12/2010 07:24 PM, Paul Hartman wrote:
>[...]
> In X the UI responsiveness randomly goes bad, keyboard especially. At
> first it'll be fine, then simply using Konsole and typing will begin
> to slow down. Also, screen output in general seems to freeze until I
> touch the mouse or keyboard. Even something like listing a directory.
> It's really weird... It gets so bad that it becomes completely
> unresponsive, freezing for minutes at a tie. It eventually un-freezes
> momentarily, long enough to logout and back in at least. I disabled
> desktop effects but it still had the same problem. I tried Gnome
> briefly last night before going to sleep and didn't experience this
> slowdown problem.
>
> Anyone else had those same problems or know what I might try? I'm
> using nvidia-drivers and tried 3 different versions with no success. I
> have not yet tried downgrading my kernel or KDE installation, but
> that's next on the list of things to try tonight.

I suppose you're running a complete ~arch system, not just some packages?

Also, I had a somewhat similar problem with GUI slowness.  It was a 
matter of disabling the "Use VSync" checkbox in System Settings->Desktop 
Effects->Advanced tab and enabling the "Disable functionality checks" 
box in the same tab.  Note that the desktop and all apps will keep being 
tear-free and VSynced even if making those changes in System Settings.

Furthermore, I've set:

   CheckIsSafe=false

in my ~/.kde4/share/config/kwinrc

After all that, KDE 4.5.0 runs perfectly for me using 
gentoo-sources-2.6.35-r1, xorg-server-1.8.99.905, and the following live 
(9999) packages:

media-libs/mesa
x11-proto/glproto
x11-proto/dri2proto
x11-libs/libdrm
x11-drivers/xf86-video-ati

Using KMS.