Re: [gentoo-desktop] Video Card Q965 + i810-2.0.0 + TVTime: high CPU usage by X

[Donnie Berkholz]

On 13:04 Wed 23 Jan     , Dirk Gassen wrote:
> Ok, I made some progress on this:
>
> I was able to get the same performance of X on the 945G with 1.x intel
> driver (620GX) and the 965Q with 2.0 intel driver (745) with the following
> setup of the MTRR registers:
>
> echo "base=0x0 size=0x80000000 type=write-back" >| /proc/mtrr
> echo "base=0x80000000 size=0x10000000 type=write-combining" >| /proc/mtrr
>
> (Originally I didn't have the second line)
>
> These post were very helpful (don't know why I didn't find them earlier):
>
> http://forums.gentoo.org/viewtopic-t-563647-highlight-.html
> http://forums.gentoo.org/viewtopic-t-501708-highlight-optiplex.html
>
> Now the only thing that remains (I guess) is to find a proper setup of the
> MTRR registers on the 755. While playing with that I was a bit unluck... I
> was only able to make the box freeze so far.

You really shouldn't have to set up MTRRs by hand. The only time I've 
seen issues like that were when people used a hardware-accelerated 
framebuffer driver as well (e.g., intelfb) that set up the MTRRs in a 
way the X driver didn't like.

Thanks,
Donnie
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