FYI, someone here tries the patches referenced above (on a non-Ubuntu
2.6.33-rc5 tree I believe), and they do seem to resolve the screen
corruption problem.

Repeating the links here to avoid confusion:

[RFC PATCH v2 0/2] ARM: VFP: Save / restore VFP state on the signal
handler path
<http://lists.arm.linux.org.uk/lurker/message/20100204.213712.acad59f5.en.html>

[RFC PATCH v2 1/2] ARM: VFP: add support to sync the VFP state of the
current thread
<http://lists.arm.linux.org.uk/lurker/message/20100204.213802.e56207e4.en.html>

[RFC PATCH v2 2/2] ARM: VFP: preserve the HW context when calling signal
handlers
<http://lists.arm.linux.org.uk/lurker/message/20100204.213830.5bf86a58.en.html>

-- 
VFP/NEON state is not preserved around signal handlers, causing state 
corruption between user processes
https://bugs.launchpad.net/bugs/507503
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