[xubuntu-users] Xorg with 99% CPU

[Ulli Horlacher]

On Fri 2018-10-19 (19:28), Ulli Horlacher wrote:
> I am running xubuntu 16.04.
> Xorg eats up one CPU:
> 
> top - 19:24:43 up 10 min,  4 users,  load average: 1.18, 1.03, 0.62
> Tasks: 297 total,   2 running, 294 sleeping,   0 stopped,   1 zombie
> %Cpu(s): 11.7 us,  1.2 sy,  0.0 ni, 87.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
> KiB Mem : 16256752 total, 14530104 free,   404704 used,  1321944 buff/cache
> KiB Swap: 16777212 total, 16777212 free,        0 used. 15464540 avail Mem
> 
>   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
>  3095 framstag  20   0  218696  47332  36188 R  99.7  0.3   9:15.09 Xorg
>  3205 framstag  20   0  369688  22404  12384 S   5.0  0.1   0:31.11 xfsettingsd
>  3881 framstag  20   0   44208   4272   3580 R   0.3  0.0   0:00.70 top
>   
> 
> When I do a "strace -p 3095" the system freezes and I have to press the
> power button :-(

Meanwhile I am running Xubuntu 18.04 (and testet also 20.04), but the
problem is still there:

Tasks: 287 total,   2 running, 186 sleeping,   0 stopped,   1 zombie
%Cpu(s):  8.6 us,  2.2 sy,  0.0 ni, 88.3 id,  0.3 wa,  0.0 hi,  0.5 si,  0.0 st
KiB Mem : 16277796 total,  7861192 free,   608548 used,  7808056 buff/cache
KiB Swap: 16777212 total, 16740396 free,    36816 used. 15253496 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND    
20669 framstag  20   0  893812  58432  41584 R 100.0  0.4   0:05.85 Xorg       
    1 root      20   0   78208   9480   6732 S   0.0  0.1   0:24.77 systemd    
    2 root      20   0       0      0      0 S   0.0  0.0   0:00.02 kthreadd   


Also all xfce hot keys like Ctrl-F2 Alt-F4 Alt-F6 ... do not work.

But some time (1..3 minutes) after login everything seems ok!
The Xorg process is idle and all xfce hot keys work as expected.

But when I change the console with Ctrl-Alt-F1 and back with Ctrl-Alt-F7
the problems described above are back ... and do not vanish, until I
terminate the X-server and re-login.

I have a second (test-) user named "tux" who has no problems at all! 
So, it MUST be an configuration error with my main user "framstag".

I have tested:

mv ~/.config/xfce4 ~/.config/xfce4_saved
[logout]
[login]

But the problem is still there :-(

I have thousends of config files in my $HOME and I do not want to remove
$HOME/.??*

Any suggesstions how I can debug this problem?

-- 
Ullrich Horlacher              Server und Virtualisierung
Rechenzentrum TIK         
Universitaet Stuttgart         E-Mail: horlacher at tik.uni-stuttgart.de
Allmandring 30a                Tel:    ++49-711-68565868
70569 Stuttgart (Germany)      WWW:    http://www.tik.uni-stuttgart.de/
REF:<20181019172839.GA4002 at rus.uni-stuttgart.de>