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List:       kde-bugs-dist
Subject:    Bug#33548: kwin hang bugs 26554, 33548, 23261
From:       Keunwoo Lee <klee () cs ! washington ! edu>
Date:       2001-10-19 0:39:32
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Hi.  Each of you posted a kwin bug similar to the same kwin bug that I
reported.  I am emailing you to see if we can put together a plausible
explanation for the hangs; perhaps there is a common pattern.

I am noticing, for one, that the hangs only occur when I boot my laptop on
battery power, then switch to outlet power, or vice versa.  Since Linux
uses a test at boot time to set the length of its delay loop (or used to),
and plugging in the laptop changes the CPU speed (via Intel's SpeedStep),
I have a theory that my X server gets confused by dynamic CPU speed
changes and sends events with oddly ordered timestamps.

Right now this is a crackpot theory, since I haven't tried to capture the
X events during lockup or pointed my debugger at the kwin code responsible
for key handling.  I'm trying to build KDE 3 so that I can do so.  In any
case, the bug seems to be timing-dependent, on my machine.

Have any of you noticed external circumstances or patterns common to your
kwin hang incidents?  Perhaps something that might affect your X server's
event timing?

~k.lee

CC:'ed to 33548@bugs.kde.org because I thought our discussion could go in
the bug database.

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