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Re: HEADS UP: graphics driver fixes


Thank you very much for your great work.

amd64 HEAD kernel enables my Vaio Pro 11 external display connection
Direct HDMI connection does not work like before, but my machine
can output display signal to my LCD via genuine HDMI to VGA converter.

HEAD fixes PR kern/49431 partially.
I will post the detail to the PR.

Thank you again.

From: Taylor R Campbell <>, Date: Sat, 28 Feb 2015 06:24:58 +0000

> tl;dr: If DRM/KMS has been flaky for you, please try again in HEAD!
> I recently found a bit of spare time to look for bugs I'd left in
> DRM/KMS which have left a lot of systems kinda-sorta working but not
> acceptably.
> In so doing, I found several classes of bugs related to timeouts --
> about two dozen different bugs altogether, in different timed waits,
> including detecting displays, waiting for rendering commands to
> complete, and waiting for vertical blanks.  This affects all DRM
> drivers (at the moment, just Intel and Radeon).
> I've reviewed all these timed waits, and I don't see any more of these
> bugs.  Obviously this code could use more eyeballs!  (Grep for
> `DRM_.*WAIT.*_UNTIL' if you'd like to lend yours.)  But if you've been
> having trouble with blank screens or flaky rendering or frequent hangs
> -- I can't promise anything, but please try again with a kernel from
> HEAD and let me know how it goes.
> P.S.  Nouveau now compiles, although it doesn't link yet.  Needs a bit
> more work to get it to a state that can be tested, but most of the
> tedious work is done.  Let me know if you'd like to take a stab at it
> and I'd be happy to set you in the right direction.
> P.P.S.  If you've sent me mail about graphics issues and I haven't
> replied, I'm sorry -- I have been too busy to deal with this properly
> in the past few months.  If these changes don't fix your issue, please
> file a PR so it'll be less likely to be forgotten.

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