I replaced my 13.04 install and with Debian wheezy, then unstable, but didn't have any video hangs.
I then tried a clean install of 13.04 (as opposed to 12.10 then 13.04 as before) and have had a couple of hangs. The first was a "soft hang" where I could kill my desktop session by switching to a virtual console. The rest have been hard machine hangs, the last one while I was on youtube.
I replaced my 13.04 install and with Debian wheezy, then unstable, but didn't have any video hangs.
I then tried a clean install of 13.04 (as opposed to 12.10 then 13.04 as before) and have had a couple of hangs. The first was a "soft hang" where I could kill my desktop session by switching to a virtual console. The rest have been hard machine hangs, the last one while I was on youtube.