X Consumes constant 90-99% CPU usage

Gerard Beekmans gerard at linuxfromscratch.org
Mon Nov 20 06:56:25 PST 2000

On November 18, 2000 09:32 am, you wrote:
> Hi there.
> I just downloaded and installed XFree86 4.01 from sources. However, X is
> very slow. Since I have a Athlon 600, 128 MB, and a Matrox Millenium G400
> 32Mb, I decided it couldnt be slow hardware, and I ran 'top'. 'top' shows X
> as using a constant 90-99% CPU usage. Even if I replace my window manager
> by twm, X still uses 90-99% CPU, so its not my window manager. When I boot
> into my Mandrake distro instead of LFS on the same system and run X from my
> Mandrake distro, it runs fine. So I guess its not faulty hardware either. I
> recompiled twice to see if something went wrong there, and even went
> through the trouble of downloading and installing the precompiled binarys
> from xfree86.org, but even that did not solve my problem. Only if I switch
> from X to a virtual console using ALT-Fxx, does the cpu usage of X drop
> down again to (almost) zero. And then as soon as I switch back to my X
> session, it goes all the way back up again and stays there. I am running
> the mga driver that comes with XFree86 401 and not the driver that Matrox
> supplies themselves for X.
> Does anyone know what could be going on here? I have no idea on where to
> start looking, or how to even start to troubleshoot this issue. If someone
> could give me a few pointers here, that would be greatly appreciated.
> Thanks.

It does seem like a mga driver problem. Try the driver that Matrox supplies. 
That's the only way you can be 100% sure it's the driver and not something 

Gerard Beekmans

-*- If Linux doesn't have the solution, you have the wrong problem -*-

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