Comment 18 for bug 1300215

After upgrading to Kubuntu 15.04 (via 14.10) from 14.04, I started having new issues with overheating. I have a Dell XPS 13 (Developer edition) with Intel HD4000.

In particular it is now difficult to watch HD videos (e.g. from Crunchyroll.com), whether through Firefox or Chrome. After a couple of minutes, the CPU throttles hard as it gets too hot (verified with sensors), making the video unwatchable. This is not an issue I observed back when I was running 14.04.

After reading around, I installed the vdpau libraries, but that didn't help. I then found this issue, and saw that vdpauinfo gave the same error report.

I don't know that it is a very good workaround yet, but doing
VDPAU_DRIVER=va_gl firefox
got me through the video I was watching without throttling (it still got relatively hot though).

The suggestion with the ppa above did not work as apt refused to use that repo.

To me, due to the overheating, this seems to be a rather critical issue.