Comment 61 for bug 148408

I don't know if this will fix this specific issue, but I've backported a bunch of high importance patches that upstream recommended, that fix problems sort of like this one, so I think it would be worth the time to test. Please try this .deb and report what you find:

http://people.ubuntu.com/~bryce/Testing/ati/

If we can determine that the patches in this deb fix this bug, they may be candidates for backporting to Hardy. In particular, this one looks like it might solve this bug:

    + 102_radeon_restore_clock_gating_on_vt_switch.patch:
      Fixes issue which causes hangs on resume (vt switch) for non-avivo's,
      and forces clock errata for r300 and rv100 variants.