Situation here: Clean install of 10.04 Lucid Lynx with a current kernel
of:
2.6.32-24-generic #41-Ubuntu SMP Thu Aug 19 01:38:40 UTC 2010 x86_64
"lspci | grep VGA"
reports a
01:00.0 VGA compatible controller: ATI Technologies Inc RV610 video
device [Radeon HD 2400 PRO]
The setting of
GRUB_CMDLINE_LINUX="radeon.modeset=0"
in /etc/default/grub resolves the performance issues discussed here for
me but xrandr reports a max. screen resolution of 1280x1024 which is
nothing compared to the
2048x1536 80.0* 75.0 75.0 60.0
at which X is running with KMS enabled right now. The proprietary fglrx
shipped with Lucid also had some issues regarding performance (resizing
windows) as well as screen resolution ("unable to read edid
information").
--
[RS100] desktop became slow after upgrading to Lucid
https://bugs.launchpad.net/bugs/544496
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