On Wed, 12 Jan 2011 11:22:58 -0800 Linus Torvalds torvalds@linux-foundation.org wrote:
On Tue, Jan 11, 2011 at 10:03 PM, Dave Airlie airlied@linux.ie wrote:
I'm stuck at home with just my i5 laptop due to the office being shut due to the ongoing floods. But I've booted and ran this for a few hours and it seems to be better than the current tree. It contains a couple of patches to fix DMAR interaction issues I see on this laptop on top of Chris's pull.
Hmm. I'm not seeing the screensaver issue any more, but there's something wrong with video. At least the TED ones (I'm not seeing it on a youtube video i tried). See for example
http://www.ted.com/talks/lang/eng/david_gallo_shows_underwater_astonishments...
and when there is fast movement in the video (like when the octopus is spooked), I get these odd lines of noise.
In fact, while I noticed the lines in the video itself, it's actually most repeatably noticeable in the buttons underneath while the video is playing: make your mouse go back-and-forth between the "rate" and "share" buttons, and they get corrupted (and it also corrupts the progress bar).
It looks a bit like the noise you get with insufficient memory bandwidth, but I doubt that's the case here. Perhaps just some motion-comp problem?
Any ideas?
Since I doubt we're actually offloading to our video decode kernels for Flash video on your machine, it could very well be a memory bw issue. Can you try this small patch to see if one of the low power watermarks is giving you trouble (note: cut & pasted)?
It could also be the normal power watermarks though too; you could just make plane-wm and cursor_wm higher to test that.