X2Go Bug report logs - #28
Xfixes issues with Ubuntu precise and above

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Package: x2goserver; Maintainer for x2goserver is X2Go Developers <x2go-dev@lists.x2go.org>; Source for x2goserver is src:x2goserver.

Reported by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Date: Fri, 14 Sep 2012 14:38:45 UTC

Severity: normal

Tags: confirmed

Found in version 3.1.1.3

Done: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Bug is archived. No further changes may be made.

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Subject: Bug#28: Xfixes issues with Ubuntu precise and above
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Date: Wed, 09 Jan 2013 16:22:18 +0100
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: 28@bugs.x2go.org
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Re-opening this issue as it is not 100% solved and understood...

The situation is: with extensions XFIXES enabled in nxagent/x2goagent   
we observe KDE crashes on Ubuntu precise and above. The crashes happen  
 in kwin.

The problem could be tracked down to some problems in libxfixes. The   
change must have been between libxfixes from oneiric and libxfixes   
from precise.

On IRC I wrote this about the observed issue:

15:48 < sunweaver> siretart: I might have found the libxfixes issue   
with libxfixes since precise...
15:48 < sunweaver> at least I have several question marks...
15:49 < sunweaver> the xserver-xorg src package in precise has a patch  
 named: 500_pointer_barrier_thresholds.diff
15:50 < sunweaver> this patches in xfixes v6 code into the xfixes v5 extension
15:51 < sunweaver> in that patch you can also see that the xfixes   
extension version is also incremented (5 -> 6)
15:52 < sunweaver> the libxfixes 1:5.0-4ubuntu4 and the package   
x11proto-fixes-dev 1:5.0-2ubuntu1 package also have patches for this   
improvement: both named
                   01_fixesproto-v6.diff.
15:54 < sunweaver> However, when looking at a build of libxfixes   
5.0-4ubuntu4 I see a config.h file that announces itself with   
PACKAGE_VERSION 5.0.
15:55 < sunweaver> So, my current guess is that libxfixes annouces   
itself as v5 and also does a xlib-xserver version handshake based on   
v5, but then
                   executes code from libxfixes v6 which then breaks nxagent.
15:55 < sunweaver> Is that possible?

Can anyone comment on this?

Mike

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