Comment 0 for bug 557611

On an Ubuntu Lucid installation (at the moment of writing still beta) KMS should be enabled on the Radeon Xpress 200M.
But intialization of KMS does fail with the lines in attachment kms_fail.txt

Apparently the driver doesn't like the card's memory, which I believe is an IGP card without memory itself.

Next thing I tried was passing 'radeon agpmode=-1' to the module, to force it into PCI mode.
(even though the card does say in lshw:
description: VGA compatible controller
                product: RC410 [Radeon Xpress 200M]
                vendor: ATI Technologies Inc
                physical id: 5
                bus info: pci@0000:01:05.0
                version: 00
                width: 32 bits
                clock: 66MHz
                capabilities: agp agp-3.0 pm msi cap_list
                configuration: latency=64 mingnt=8
                resources: memory:c0000000-cfffffff(prefetchable) ioport:9800(size=256) memory:fe1f0000-fe1fffff memory:fe1c0000fe1dffff(prefetchable)

and so I think is an AGP card and not a PCI(E) card)

anyhow, this does seem to improve the situation, because now can KMS be loaded. But a new error appears: it says it fails the r100_ring_test with 0xCAFEDEAD. I don't know why it fails, I found multiple people with this problem on the internet, but nobody with a fix.
The log of this one I will attach as kms_forceagp-1_fail.txt

Notes:
Tested: kernel 2.6.32(from lucid with DRM code), 2.6.33 and 2.6.34-rc1
Tested: DRM 2.4.18 (from lucid), 2.4.19+git20100318 (xorg-edgers repository)
I load radeon in /etc/modules to force the loading of the driver in time to assure that the firmware does load in time (recommended by developers)

Already thanks for your time, if you need more information/testing I am willing to of course.