https://bugzilla.kernel.org/show_bug.cgi?id=42678
--- Comment #7 from Jérôme Glisse glisse@freedesktop.org 2012-02-24 02:53:43 --- You no longer have those lockup ? The fix in the ddx might explain why the kernel was no longer able to recover from lockup. Sadly userspace change can affect kernel successfulness at things like lockup recovering.