Arch Linux

W54J04S07T

Member

Registered: 2016-06-27

Posts: 140

Resolved: FireFox on OpenBox: screen blanks during full screen video

As the title says with FF 150 I have a situation specific to OpenBox in which watching full screen videos
will be interrupted by the system screen blanker.  This issue does not exhibit on KDE.  I can't speak
for other environments.  I can tell you that "xset s off" command on OB does not eliminate the issue
( either at the command line or inserted in autostart ).

I've tested other browsers e.g. -- chromium and falkon as well.  Chromium works just fine, but falkon ( i believe
derived from FF ) exhibits the same issue.

I attempted to downgrade FF to v149 but the issue exhibited there as well... although oddly enough,
before the update ( done Saturday 25 ) it worked just fine.

I can't seem to find any recent updates to OB ( but I'm no expert ) ...just the FF update. 

Anybody have any ideas where to go next?

Last edited by W54J04S07T (2026-04-29 14:03:39)

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 75,545

Re: Resolved: FireFox on OpenBox: screen blanks during full screen video

I can tell you that "xset s off" command on OB does not eliminate the issue

Is it rather DPMS than screen blank?
FF 150 seems to have moved a lot of stuff towards xdg-desktop-portal and on openbox you'll at most use xdg-desktop-portal-gtk and also have no org.freedesktop.ScreenSaver interface, see https://bbs.archlinux.org/viewtopic.php … 1#p2296071

Also check about:config and filter for xdg - you might be able to disable this behavior.

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W54J04S07T

Member

Registered: 2016-06-27

Posts: 140

Re: Resolved: FireFox on OpenBox: screen blanks during full screen video

I can tell you that "xset s off" command on OB does not eliminate the issue

Also check about:config and filter for xdg - you might be able to disable this behavior.

Which of these:

widget.use-xdg-desktop-portal.file-picker	2		
widget.use-xdg-desktop-portal.location	2		
widget.use-xdg-desktop-portal.mime-handler	2		
widget.use-xdg-desktop-portal.native-messaging	0		
widget.use-xdg-desktop-portal.open-uri	2		
widget.use-xdg-desktop-portal.settings

would you recommend changing?

I installed xssproxy, and that didn't seem to do it so I assume something here
needs adjusting.  Don't know what though.

Last edited by W54J04S07T (2026-04-27 23:53:03)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,183

Re: Resolved: FireFox on OpenBox: screen blanks during full screen video

It doesn't look like any of these controls this.

You need to start xssproxy in the background (e.g.

xssproxy &

in your .xinitrc or in some other spot you can launch commands that are only relevant for the openbox session)

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 75,545

Re: Resolved: FireFox on OpenBox: screen blanks during full screen video

Also check whether FF causes org.freedesktop.ScreenSaver related errors and

set -dpms

will disable DPMS (+dpms reactivates it)

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W54J04S07T

Member

Registered: 2016-06-27

Posts: 140

Re: Resolved: FireFox on OpenBox: screen blanks during full screen video

It doesn't look like any of these controls this.

You need to start xssproxy in the background (e.g.

xssproxy &

in your .xinitrc or in some other spot you can launch commands that are only relevant for the openbox session)

On a system with multiple DEs ( KDE, LXDE, OpenBox )  this works!

On a pure OpenBox system on bare metal... does not seem to work...   /sigh 

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 75,545

Re: Resolved: FireFox on OpenBox: screen blanks during full screen video

Please don't paraphrase, https://bbs.archlinux.org/viewtopic.php?id=57855
"does not seem to work" means
* xssproxy doesn't start
* doesn't provide the org.freedesktop.ScreenSaver interface
* portal complains about not supporting the org.freedesktop.ScreenSaver interface
* the org.freedesktop.ScreenSaver interface doesn't functionally prevent the system to blank the screen or enter dpms
?

Edit: xdg-desktop-portal is an optional dependency for FF - do you have that installed on the bare-bones system?

Last edited by seth (2026-04-28 18:39:50)

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W54J04S07T

Member

Registered: 2016-06-27

Posts: 140

Re: Resolved: FireFox on OpenBox: screen blanks during full screen video

Also check whether FF causes org.freedesktop.ScreenSaver related errors and

set -dpms

will disable DPMS (+dpms reactivates it)

Is that "set" or "xset" ?  I'm getting command syntax errors both ways.

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 75,545

Re: Resolved: FireFox on OpenBox: screen blanks during full screen video

"xset", sorry.
What error?

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W54J04S07T

Member

Registered: 2016-06-27

Posts: 140

Re: Resolved: FireFox on OpenBox: screen blanks during full screen video

Problem solved by actually getting xssproxy running.

Turns out xssproxy in the autostart of this particular system did not actually run...
Running it from a xterm session ( "xssproxy &" )  got things going.

ThankYou.

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 75,545

Re: Resolved: FireFox on OpenBox: screen blanks during full screen video

https://wiki.archlinux.org/title/Openbox#Autostart

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