I've been running the proposed kernel (on 12.04.2) since this morning and it indeed seems to work fine. No GPU hung so far (same as 3.5.0-27.47~lp1140716).
# uname -a
Linux pieleric 3.5.0-28-generic #47~precise1-Ubuntu SMP Wed Apr 10 15:10:23 UTC 2013 i686 i686 i386 GNU/Linux
I've been running the proposed kernel (on 12.04.2) since this morning and it indeed seems to work fine. No GPU hung so far (same as 3.5.0-27. 47~lp1140716) .
# uname -a
Linux pieleric 3.5.0-28-generic #47~precise1-Ubuntu SMP Wed Apr 10 15:10:23 UTC 2013 i686 i686 i386 GNU/Linux