X using ~ 35% of a CPU core

From	Celejar <celejar@gmail.com>
Newsgroups	linux.debian.user
Subject	X using ~ 35% of a CPU core
Date	2015-11-30 19:50 +0100
Message-ID	<qABGq-7gu-19@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi,

On my ThinkPad T61 (Core 2 Duo T7300 @ 2.00GHZ) running Debian stable
(8.2) with Xfce, the X process (/usr/bin/X) has recently begun to
consume some 35% (seems to vary between 33-40 %) for several minutes at
a time, with the system becoming unpleasantly unresponsive during this
time. It seems to mostly happen after resuming from suspend-to-ram, and
usually clears up after a few minutes with the system performance
returning to normal. I run mostly straightforward stable, albeit with
self-compiled kernels from upstream (vanilla). I first noticed the
problem on 4.1.13 and am now seeing it under 4.2.6. I don't think I've
seen this behavior in the past, and I'm not sure what has triggered it.
I see it even when not running much of a load under X at all, e.g.,
just recently, when all I had running was Xfce Terminal, Sylpheed, and
one (simple, small) OpenOffice writer document. Any idea what this is,
or how I can fix / troubleshoot?

Thanks,
Celejar

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X using ~ 35% of a CPU core Celejar <celejar@gmail.com> - 2015-11-30 19:50 +0100
  Re: X using ~ 35% of a CPU core Sven Arvidsson <sa@whiz.se> - 2015-11-30 21:50 +0100
    Re: X using ~ 35% of a CPU core Celejar <celejar@gmail.com> - 2015-12-02 00:20 +0100
      Re: X using ~ 35% of a CPU core Sven Arvidsson <sa@whiz.se> - 2015-12-02 16:00 +0100
        Re: X using ~ 35% of a CPU core Celejar <celejar@gmail.com> - 2015-12-03 06:10 +0100

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