[systemd-devel] xorg uses 100% CPU after upgrading to 226

[David Herrmann]

Hi

On Tue, Sep 22, 2015 at 9:23 PM, Jin Liu <m.liu.jin at gmail.com> wrote:
> After upgrading to 226, the Xorg process keeps using 100% CPU. Also, the
> "xrandr --dpi 168" command in my .xinitrc no longer works.
>
> My startx.service and .xinitrc:
>
> $ systemctl cat startx.service
> # /etc/systemd/system/startx.service
> [Unit]
> Description=Direct X login
> After=systemd-user-sessions.service
> Conflicts=getty at tty1.service
>
> [Service]
> User=jin
> TTYPath=/dev/tty1
> PAMName=login
> Environment=DISPLAY=:0
> ExecStart=/usr/bin/bash --login -c "cd; (/usr/lib/xorg-server/Xorg -nolisten
> tcp vt1 &); source .xinitrc"
>
> [Install]
> WantedBy=graphical.target
> $ cat .xinitrc
> #!/bin/sh
> #
> # ~/.xinitrc
> #
> # Executed by startx (run your window manager from here)
>
> export DESKTOP_SESSION="plasma"
>
> if [ -d /etc/X11/xinit/xinitrc.d ]; then
>  for f in /etc/X11/xinit/xinitrc.d/*; do
>    [ -x "$f" ] && . "$f"
>  done
>  unset f
> fi
>
> xrandr --dpi 168
>
> exec /usr/bin/startkde
>
> $
>
> BTW, if I move the "xrandr --dpi 168" line into /usr/bin/startkde, it works
> again (only DPI setting. Xorg still uses 100% CPU).
>
> What change in version 226 could cause the above problem, and how should I
> change the above files to fix it? Thanks.

Please run "strace -p <pid>" on the offending process or "perf top".
Then try to figure out which function is spinning.

Thanks
David