Weird drawing errors with Radeon Mobility 7500 on IBM T30 laptop

[Anders Nordby]

Hi,

>From dmesg:

agp0: <Intel 82845 host to AGP bridge> mem 0xe0000000-0xe3ffffff at
device 0.0 on pci0
drm0: <ATI Radeon LW Mobility 7500 M7> port 0x3000-0x30ff mem
0xd0100000-0xd010ffff,0xe8000000-0xefffffff irq 11 at device 0.0 on pci1
info: [drm] AGP at 0xe0000000 64MB
info: [drm] Initialized radeon 1.8.0 20020828 on minor 0

Special tweaks used on this laptop:

/boot/loader.conf:

hw.pci.allow_unsupported_io_range="1"
hw.cbb.start_memory="0x20000000"
agp_load="NO"

/boot/device.hints:

hint.acpi.0.disabled="1"
hint.apm.0.disabled="0"
hint.apm.0.flags="0x20"

If I don't set VideoRam in XF86Config (or set it to a low value), dri
does not work at all (glxinfo reports direct rendering: No). If I set it
to a little more than 17 MB (XFree86 reports (WW) RADEON(0): Static
buffer allocation failed -- need at least 17325 kB video memory if I set
it too low), dri works (glxinfo reports direct rendering: Yes). When dri
works, I get the drawing errors.

A couple of xv grabs of what I see:

http://anders.fix.no/test/t30drm/grab.png
http://anders.fix.no/test/t30drm/xgrab.png

My XFree86.0.log:

http://anders.fix.no/test/t30drm/XFree86.0.log

scanpci reports:

pci bus 0x0001 cardnum 0x00 function 0x00: vendor 0x1002 device 0x4c57
 ATI Technologies Inc Radeon Mobility M7 LW [Radeon Mobility 7500]

pciconf -l -v reports:

drm0 at pci1:0:0:  class=0x030000 card=0x05171014 chip=0x4c571002 rev=0x00
hdr=0x00
    vendor   = 'ATI Technologies'
    device   = 'Radeon Mobility M7 LW'
    class    = display
    subclass = VGA

glxgears reports 633 FPS. This is a nice laptop, but it would be better
with no drawing errors using dri/drm. :-) Any tips on how to make them
go away? Patches I can try?

PS: I run XFree86 4.3.0 on FreeBSD 5.1-RELEASE.

Cheers,

-- 
Anders.