Ubuntu
xserver-xorg-video-intel package

  1. Bug #1354046
  2. Comment #13

Comment 13 for bug 1354046

Revision history for this message
Jonas G. Drange (jonas-drange) wrote :

I've near searched to the end of Google to find a solution. One of my observations is that the symptoms of other bugs never matches the symptoms of this bug. On my laptop, everything seems to be OK—that is, until I run some thing requiring 3D. Then my machine grinds to a halt. No logs, no nothing. 100% on all four cores.

So, I'm thinking, what is _something_ is misbehaving, but the system believes everything to be OK? The answer to that, it seems, is cpu frequency scaling.

My CPU cores are scaled using the 'powersave' governance. Using Half Life 2 as a benchmark (this game ran well on trusty, but currently is not playable after 1.5 minutes), I looked at what happened to cpu frequencies while playing the game. At first, all four cores jumped to 3GHz [1]. Then, surprisingly, they were lowered to ~130 MHz [2].

Uh.

So, setting my cpu frequency scaling governance to 'performance' partly fixes this issue.

[1] http://pastebin.ubuntu.com/10276246/
[2] http://pastebin.ubuntu.com/10276257/