[Bug 106175] amdgpu.dc=1 shows performance issues with Xorg compositors when moving windows

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106175

Michel Dänzer <michel at daenzer.net> changed:

           What    |Removed                     |Added
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                 CC|                            |nicholas.kazlauskas at amd.com

--- Comment #40 from Michel Dänzer <michel at daenzer.net> ---
For the DC guys: We've now confirmed that the problem is due to some bad
interaction between page flips and HW cursor updates.


(In reply to tempel.julian from comment #37)
> I think software cursor would also be unusable even if it left pageflipping
> on. It causes nasty issues like flickering cursor or other visual corruption.

Yeah, that's why xf86-video-amdgpu disables DRI page flipping while there's an
SW cursor, as I said in comment 31. Note that the modesetting driver doesn't do
this, allowing users to run into those issues.


(In reply to grmat from comment #39)
> (In reply to Michel Dänzer from comment #34)
> > 
> > Right, you'd have to disable TearFree as well.
> 
> Then I think the logs should represent that, even when the manpage tells me
> that tearfree is using page flipping.  If i set explicitly to off, and the
> log says so, I expect it to be off.

Patches or at least specific suggestions welcome, but I'm afraid it's tricky to
describe all possible interactions concisely and clearly. DRI page flipping and
TearFree are mostly separate things, but they use the same kernel page flipping
mechanism, which is what matters for this issue.

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