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0e1f616
(Get the code!)
I've also just reproduced this problem (Firefox scrolling) on fresh Jaunty 9.04 live CD, using a 3COM wireless card rather than ndisgtk. I think this means we can rule out anything to do with persistent configuration errors or corrupted packages, or realplayer or ndiswrapper (and probably nothing to do with IRQ conflict with the PCMCIA card).
I think we may be dealing with at least 3 separate bugs - this one 404331 has been present since HDD was formatted and Windows XP and Hardy installed. It only hangs when DRI is enabled, and then Xorg takes 99% of CPU and cursor movement is jerky. It was definitely present in Jaunty, but I'm *not* 100% convinced it's in Karmic, because the other, newer bugs mask it (including one in alpha-5 live CD which causes distorted screen corruption a different freeze involving dd and rsyslogd and stationary cursor; and the reproducible effect I've only seen on latest karmic on the installed version with 'tartan' window corruption) and also I have DRI turned off just in case on the HD installation.
I'll continue to test, but I'm not sure which bug to concentrate on (about to try upgrading individual packages on live CD to alpha-5). This one (404331) is annoyingly infrequent, because I usually have to turn DRI and work for an hour or two before it happens, meaning losing some work...