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35a32c5
(Get the code!)
This still seems to be a problem in recent kernel versions (KMS enabled)!
Oddly, with kernel 2.6.33, everything seems fine (lucid + ppa kde and all xorg variants, including xorg-edgers on a Thinkpad T500, i915).
But with every version from 2.6.34 up to 2.6.36-rc4 I have tried, there clearly is a bad memory leak making the machine unusable within several hours (watching movies does is not helpful in particular).
This slabtop output shows what happens after less than two hours or so of normal activity (switching desktops, moving windows etc.):
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
211200 211200 100% 0.02K 825 256 3300K kmalloc-16
It'd be great if anyone who knows more about the state of this problem could comment or post a solution if available...