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Bug#1030609: Sluggish performance in Bookworm (and Bullseye since version 0.9.13+dfsg-2+deb11u1)



Package: x11vnc
Version: 0.9.16-8+b1

I am using VNC via SSH using x11vnc to access my remote desktop from home. x11vnc is called with the following arguments:

x11vnc -quiet -safer -localhost -nopw -once -display :0

Since upgrading to Debian Bookworm about half a year ago, update performance degraded rapidly and the following messages started showing up in the output from x11vnc on various events (opening of windows, focus changes):

PORT=5900

The VNC desktop is:      localhost:0

*** fb_push ublen NOT ZERO: -1616838418
*** fb_push ublen NOT ZERO: 932745215
*** fb_push ublen NOT ZERO: -1644826
*** fb_push ublen NOT ZERO: -1711237889
*** fb_push ublen NOT ZERO: -1711237889

The same issue has been reported by at least one other user as well in the Debian forums [1].

After erroneously assuming this to be caused by a patch that was backported to Bullseye (see [2] and [3]), it appears now to be a packaging bug as recompiling x11vnc locally fixes the issue.

References:

[1] https://forums.debian.net/viewtopic.php?t=153655
[2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1027043
[3] https://github.com/LibVNC/x11vnc/issues/220

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