Unless I add radeon.modeset=0 (i.e. disable KMS) I invariably get a
screen corruption after log-on (using kdm). That is, I can log on but at
that point the screen will ‘black out’ and the computer/X will lock up.
I do not see any screen corruption with kwin using radeon.modeset=0,
though. lshw reports:
lshw -C display
WARNING: you should run this program as super-user.
*-display UNCLAIMED
description: VGA compatible controller
product: RC410 [Radeon Xpress 200M]
vendor: ATI Technologies Inc
physical id: 5
bus info: p...@0000:01:05.0
version: 00
width: 32 bits
clock: 66MHz
capabilities: bus_master cap_list
configuration: latency=64 mingnt=8
resources: memory:90000000-9fffffff(prefetchable) ioport:7800(size=256)
memory:f88f0000-f88fffff memory:f88c0000-f88dffff(prefetchable)
--
[Lucid] KMS doesn't work properly with old Radeon cards
https://bugs.launchpad.net/bugs/509273
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