On Wed, 12 Jan 2011 15:05:36 -0800, Linus Torvalds torvalds@linux-foundation.org wrote:
On Wed, Jan 12, 2011 at 2:40 PM, Chris Wilson chris@chris-wilson.co.uk wrote:
Just the SNB machine?
No. I just checked. Reverting that commit on my other machine makes that TED video on my Core i5 machine look fine too.
So it's definitely the same bug on both Sandybridge and Core-i5 (I guess that's "Ironlake" in the crazy intel codename naming), just two slightly different symptoms. And I worried a bit that my bisect was bogus, but with the revert clearing it up on the other machine, I'm confident the bisect was good too.
On my sandybridge machine, the corruption happens already at the gdm login screen, which is why I used that one to bisect things. I'm including a (bad) photo taken with my cellphone of what the corruption looks like - see how the "sandybridge.linux-foundation.org" machine name text has been corrupted, and obviously my name (and the "e" in Other). And that blue rounded rectangle should contain "Log in as torvalds" or something like that, but instead it's clear.
Yes, that looks consistent with using the wrong relocation entry or GTT offset within the batch.
Thanks, -Chris