It seems that KMS is causing problems on Compaq Evo N1015v as well.
Screen freezes after some time. Compiz was extremely slow so I disabled
it.
Running sudo lshw -c video with KMS enabled froze the computer as well.
$ sudo lshw -c video
[sudo] password for matej:
*-display UNCLAIMED
description: VGA compatible controller
product: Radeon Mobility U1
vendor: ATI Technologies Inc
physical id: 5
bus info: p...@0000:01:05.0
version: 00
width: 32 bits
clock: 66MHz
capabilities: agp agp-2.0 pm bus_master cap_list
configuration: latency=66 mingnt=8
resources: memory:f0000000-f7ffffff(prefetchable) ioport:9000(size=256)
memory:e8100000-e810ffff memory:e8120000-e813ffff(prefetchable)
$ lspci | grep ATI
00:00.0 Host bridge: ATI Technologies Inc AGP Bridge [IGP 320M] (rev 13)
00:01.0 PCI bridge: ATI Technologies Inc PCI Bridge [IGP 320M] (rev 01)
01:05.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility U1
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[Lucid] ATI KMS causes DRM error on X200M
https://bugs.launchpad.net/bugs/509273
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