Comment 56 for bug 541511
Revision history for this message
|
|
#56 |
© 2004
Canonical Ltd.
•
Terms of use
•
Data privacy
•
Contact Launchpad Support
•
Blog
•
Careers
•
System status
•
f33e652
(Get the code!)
> --- Comment #54 from Tony White <email address hidden> 2010-03-29 14:12:51 PST ---
> Hi guys,
> Really appreciate the work you guys have been doing to try to fix this issue.
> And I truly mean that. This is a horrible issue.
>
> If you haven't read it, the intel data sheet for this graphics card is here :
> http://
I know about this specsheet and I've read through it already a few weeks
ago. It only contains detailed feature descriptions of the gmch plus a few
non-graphics-core related register definitions. There's nothing in there
that could give us a hint as to how gtt<->cpu caches work and how to fix
it.
If you want to help, please test my latest patch (v6) and report how it
fares on your machine.
To everyone else who has already tested this: Thanks alot. Small summary
on the state of i855 cache coherency (please correct me if I'm wrong):
- Latest version works on three boxes (from Bruno, 2points and mine).
- It also seems to work on legolas' box, but that machine has some other
issue. Pardon for being the messenger, but looks like your machine is
toast :(
- The most likely unrelated BUG in put_pages hasn't surfaced again.
I won't submit this as is anytime soon for two reasons:
- The code is still rather ugly atm. I need to clean it up.
- This patch is a way too horrible hack to submit it for inclusion with a
straight face.
To fix the latter, I want some more test reports. Given how many bug
reports downstream gathered, it shouldn't be a problem to find more
testers (distro maintainers: hint, hint). Please only test on i855
chipsets, i845 still seems to have some problems. If it works (check the
demsg for chipset flush related backtraces), please add your tested-by
line with a small blurb about your machine to this bug report, like this:
Tested-by: Daniel Vetter <email address hidden> (IBM Thinkpad X40)
If it doesn't work, hit me with your dmesg and i915_error_state output ;)
Bruno, legolas, 2points, please add your tested-by, too.