Problem with xcompmgr on Radeon card

[Edward Ye]

On Tue, 2004-10-05 at 10:44, Francesco wrote:
> Francesco wrote:
> 
> >> Try using radeon framebuffer driver.
> >>
> > I'm recompiling kernel with radeon fb instead of vesa.
> > Will post here results.
> >
> I get now:
> (==) RADEON(0): Write-combining range (0xe0000000,0x4000000)
> but I still get very slow X when xcompmgr is executed.
> I tryed disabling fb completely too.
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hi friend, i have a radeon 7500 mobility M7 on my laptop. To fix the
MTRR problem, all i have to do it to add this line to you boot up script

echo "disable=1" >| /proc/mtrr

echo "base=0x48000000 size=0x2000000 type=write-combining" >| /proc/mtrr

the base and size value is determined by your hardware configuration.
you can easy grep the log of your xfree or xorg, normally at /var/log

some thing like this:

(--) RADEON(0): Chipset: "ATI Radeon Mobility M7 LW (AGP)" (ChipID =
0x4c57)
(--) RADEON(0): Linear framebuffer at 0x48000000
(II) RADEON(0): VideoRAM override ignored, this driver autodetects RAM
(--) RADEON(0): VideoRAM: 32768 kByte (128 bit DDR SDRAM)

then 0x48000000 goes to your base value and 32768 kbyte ---> 0x2000000
as your video memory size.

The successful message looks like this

(==) RADEON(0): Write-combining range (0x48000000,0x2000000)

in your X log.


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