Re: X using ~ 35% of a CPU core

From	Celejar <celejar@gmail.com>
Newsgroups	linux.debian.user
Subject	Re: X using ~ 35% of a CPU core
Date	2015-12-02 00:20 +0100
Message-ID	<qB2nh-7GU-53@gated-at.bofh.it> (permalink)
References	<qABGq-7gu-19@gated-at.bofh.it> <qADyy-8ry-21@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Mon, 30 Nov 2015 21:47:43 +0100
Sven Arvidsson <sa@whiz.se> wrote:

> On Mon, 2015-11-30 at 13:44 -0500, Celejar wrote:
> > 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

...

> Long shot, but maybe it's something similar to this? Probing for new
> screens after resume and spamming a log before giving up?
> 
> https://bbs.archlinux.org/viewtopic.php?id=204098
> 
> Would be interesting to know where the X process spends all that time,
> but I guess you would need to profile it to find out.

Thanks for the tip! My problem is actually at least somewhat similar. I
tried tailing the X log when I caught the problem occurring, and I
found zillions of these:

[ 82198.046] (II) intel(0): EDID vendor "LEN", prod id 16435
[ 82198.046] (II) intel(0): Printing DDC gathered Modelines:
[ 82198.046] (II) intel(0): Modeline "1440x900"x0.0   96.50  1440 1522 1576 1706  900 905 914 943 -hsync -vsync (56.6 kHz eP)
[ 82198.046] (II) intel(0): Modeline "1440x900"x0.0   80.44  1440 1522 1576 1706  900 905 914 943 -hsync -vsync (47.2 kHz e)
[ 82198.084] (II) intel(0): EDID vendor "LEN", prod id 16435
[ 82198.084] (II) intel(0): Printing DDC gathered Modelines:
[ 82198.084] (II) intel(0): Modeline "1440x900"x0.0   96.50  1440 1522 1576 1706  900 905 914 943 -hsync -vsync (56.6 kHz eP)
[ 82198.084] (II) intel(0): Modeline "1440x900"x0.0   80.44  1440 1522 1576 1706  900 905 914 943 -hsync -vsync (47.2 kHz e)
[ 82198.166] (II) intel(0): EDID vendor "LEN", prod id 16435
[ 82198.166] (II) intel(0): Printing DDC gathered Modelines:
[ 82198.166] (II) intel(0): Modeline "1440x900"x0.0   96.50  1440 1522 1576 1706  900 905 914 943 -hsync -vsync (56.6 kHz eP)
[ 82198.166] (II) intel(0): Modeline "1440x900"x0.0   80.44  1440 1522 1576 1706  900 905 914 943 -hsync -vsync (47.2 kHz e)

...

[ 82198.574] (II) intel(0): EDID vendor "LEN", prod id 16435
[ 82198.574] (II) intel(0): Printing DDC gathered Modelines:
[ 82198.574] (II) intel(0): Modeline "1440x900"x0.0   96.50  1440 1522 1576 1706  900 905 914 943 -hsync -vsync (56.6 kHz eP)
[ 82198.574] (II) intel(0): Modeline "1440x900"x0.0   80.44  1440 1522 1576 1706  900 905 914 943 -hsync -vsync (47.2 kHz e)
[ 82198.662] (II) intel(0): EDID vendor "LEN", prod id 16435
[ 82198.662] (II) intel(0): Printing DDC gathered Modelines:
[ 82198.662] (II) intel(0): Modeline "1440x900"x0.0   96.50  1440 1522 1576 1706  900 905 914 943 -hsync -vsync (56.6 kHz eP)
[ 82198.662] (II) intel(0): Modeline "1440x900"x0.0   80.44  1440 1522 1576 1706  900 905 914 943 -hsync -vsync (47.2 kHz e)
[ 82198.710] (II) intel(0): EDID vendor "LEN", prod id 16435
[ 82198.710] (II) intel(0): Printing DDC gathered Modelines:
[ 82198.710] (II) intel(0): Modeline "1440x900"x0.0   96.50  1440 1522 1576 1706  900 905 914 943 -hsync -vsync (56.6 kHz eP)
[ 82198.710] (II) intel(0): Modeline "1440x900"x0.0   80.44  1440 1522 1576 1706  900 905 914 943 -hsync -vsync (47.2 kHz e)


When the problem ceases (CPU usage back down to zero / normal), these
lines cease, too. Anyone know what this is, and / or how to fix it?

I found this:

https://forums.gentoo.org/viewtopic-t-716774-start-0.html

But I don't have anything like his xrandr script running, and my
problem is intermittent - it starts and stops at apparently random
times.

> Sven Arvidsson

Celejar

Thread

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

csiph-web