[Bug 99457] Excessive CPU load by the xorg-server and GUI's hard lags

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Feb 13 09:20:46 UTC 2017


Michel Dänzer <michel at daenzer.net> changed:

           What    |Removed                     |Added
         Resolution|---                         |NOTOURBUG
             Status|NEW                         |RESOLVED

--- Comment #30 from Michel Dänzer <michel at daenzer.net> ---
Thanks, now I understand what's happening:

It's a bug in the tigervnc vncHooksBlockHandler function, it doesn't handle the
function wrapping correctly: It keeps calling RADEONBlockHandler_oneshot,
although that function sets pScreen->BlockHandler = RADEONBlockHandler_KMS.
vncHooksBlockHandler needs to re-retrieve the current pScreen->BlockHandler
pointer after calling it.

Though if it turns out difficult to get this fixed in tigervnc, we can consider
a workaround.

P.S. This would also happen with the modesetting driver as of xserver 1.19.

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