[Solved] how to execute "kwin --replace" on EACH resume?

Carl Karl · 2014-08-05 12:08:55

Hello,
I started using XFCE with Kwin which is really nice, but after resume, there are sometimes artefacts or even bigger screen errors which force me to restart kwin with

kwin --replace

.
(Probably because of my old Nvidia G210 card...)

As replacing kwin is really fast, i like to do this automatically on each resume.
According to https://wiki.archlinux.org/index.php/Po … vice_files , I tried that:

/etc/systemd/system/resume@.service containing

[Unit]
Description=User resume actions
After=suspend.target

[Service]
User=%I
Type=simple
Environment=DISPLAY=:0
ExecStart=/usr/bin/kwin --replace

[Install]
WantedBy=suspend.target

This works (after enabling of course) after the FIRST resume, but not later. I understand why (as kwin is running and doesn't terminate, the service is still running and doesn't terminate, so at the next resume it isn't started again), but I don't know how to prevent this. I tried changing the type to "forking" or "oneshot", but that didn't work either.

Do you have an idea how I can get this running?
(And even better: Only running, when kwin is already running, so it isn't started in other sessions. I tried with ExecStartPre=/usr/bin/killall kwin, but that didn't work either...)

Thanks!

Last edited by Carl Karl (2014-08-06 05:39:27)

lucke · 2014-08-05 12:22:18

You could put "DISPLAY=:0 kwin --replace" in a sleep script. https://wiki.archlinux.org/index.php/Po … stem-sleep

Carl Karl · 2014-08-05 12:31:29

I hesitated doing that because sleep-scripts are executed by root AFAIK. Wouldn't it be a problem if the window-manager is executed by root instead of the user?

lucke · 2014-08-05 12:54:24

Right. You should run "DISPLAY=:0 su youruser -c "kwin --replace"" instead.

Carl Karl · 2014-08-05 13:27:43

Thanks, that works! :-D

Last step of fine tuning: In order not to mess up things if I run another session, I would like to only replace kwin when it was running before.
I tried that by entering a script in the sleep-script:

#!/bin/sh
case $1 in
    post)
        DISPLAY=:0 su carl -c "/path/to/script/replacekwinifrunning.sh"
    ;;
esac

with replacekwinifrunning.sh:

#!/bin/bash
if [ "$(pidof kwin)" ] 
then
  echo "process was found"
  kwin --replace &
else
  echo "process not found"
fi

the script itself is working, but it being called by the sleep-script isn't. (Symptom: kwin isn't replaced after resume.)
Any idea for that?

lucke · 2014-08-05 14:00:41

Try moving "DISPLAY=:0" from before "su" to before "kwin --replace &".

Carl Karl · 2014-08-05 14:15:18

Great, that works, BUT
1. After that, the network is down and won't get up again
2. kwin is crashing after some minutes (the sleep-script seems to be terminated after some time...)
3. the session is stuck, can't be suspended or rebooted anymore.

So OK, thanks for your help, now I think restarting kwin by a keyboard-hotkey when needed is more efficient than finding a solution for all that, that doesn't seem to end anywhere... ;-)

runical · 2014-08-05 18:10:53

Take a look at systemd service types on the wiki. You might be able to take advantage of the one shot service type.

Last edited by runical (2014-08-05 18:11:29)

Carl Karl · 2014-08-06 05:39:04

@runical:
I did, and as described in this thread, a solution for the initial problem was found, but it only caused more problems.
But maybe I should mark this as "solved" anyway...

runical · 2014-08-06 14:52:28

I saw that there was a problem still, which is why I pointed to the service file types. The oneshot service type executes a command and quits the service after that, meaning that the service is no longer running once you resume. It should solve the "It works only once" problem. You might have to write a shell script that forks kwin (which you already did, it seems), but that shouldn't be too much trouble.

It's worth a shot in my opinion, but it is up to you

lucke · 2014-08-06 20:11:14

Carl said he had tried oneshot.

runical · 2014-08-06 20:22:30

Oh, whoops. Seems my "I can't read for shit" was kicking in again. Sorry for the fuzz then.

EDIT: Indeed, I see it now. Just skimmed over it I guess... Sorry again.

Last edited by runical (2014-08-06 20:23:38)

Carl Karl · 2014-08-07 04:36:54

Thanks for your efforts, I found something better:
kwin isn't causing that kind of problems, if I use the lts kernel. (See https://bugzilla.novell.com/show_bug.cgi?id=889660#c9 ) Maybe this information also helps someone who stumbles upon this thread by a related search...

Last edited by Carl Karl (2014-08-07 04:40:03)

ANOKNUSA · 2014-08-07 12:29:51

Downgrading may be a suitable workaround for now, but it is not a solution.

Carl Karl · 2014-08-07 14:38:07

@ANOKNUSA:
You're right, and the existence of that bug report shows, that someone is already caring about it. As I don't have a glue about kernel development, there is nothing at least I can do more I suppose.

ANOKNUSA · 2014-08-08 14:59:47

My point was that you shouldn't declare a software problem "solved" if the "solution" is uninstalling the software. That's like saying you fixed a broken radio by throwing it in the trash and getting a different one. The thread should remain open until the issue is resolved.

Carl Karl · 2014-08-08 16:02:57

@ANOKNUSA:
Oh, in this case, the term in [ ] would have to be complicated:
The initial problem was solved, but led to a bunch of other problems. (#4 - #7)
Afterwards, I found a workaround, and now, I even changed the nvidia card for an ati card I had left...
So the correct status would be something like:
[Solved, but led to other problems, found workaround, but o.p. doesn't care anymore, because he changed hardware]
Better? ;-)

Arch Linux

#1 2014-08-05 12:08:55

[Solved] how to execute "kwin --replace" on EACH resume?

#2 2014-08-05 12:22:18

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#3 2014-08-05 12:31:29

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#4 2014-08-05 12:54:24

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#5 2014-08-05 13:27:43

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#6 2014-08-05 14:00:41

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#7 2014-08-05 14:15:18

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#8 2014-08-05 18:10:53

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#9 2014-08-06 05:39:04

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#10 2014-08-06 14:52:28

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#11 2014-08-06 20:11:14

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#12 2014-08-06 20:22:30

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#13 2014-08-07 04:36:54

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#14 2014-08-07 12:29:51

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#15 2014-08-07 14:38:07

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#16 2014-08-08 14:59:47

Re: [Solved] how to execute "kwin --replace" on EACH resume?

#17 2014-08-08 16:02:57

Re: [Solved] how to execute "kwin --replace" on EACH resume?

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