Bug 180104

Summary:	LCD backlight should be switched off when 'blank screensaver' selected
Product:	[Unmaintained] kscreensaver	Reporter:	Amit Shah <amitshah>
Component:	general	Assignee:	kscreensaver bugs tracking <kscreensaver-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	aseigo, dc46and2, oren
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Amit Shah 2009-01-09 08:41:55 UTC

Version:            (using KDE 4.1.3)
OS:                Linux
Installed from:    Fedora RPMs

I'm not sure which package to file this against.

I usually want my laptop to blank and lock the screen on some timeout. The 'blank screen' screensaver blanks the screen, but keeps the LCD backlight on, resulting in no power savings.

When the 'blank screen' screensaver is selected, switch off the backlight regardless of the power management settings.

I also have the 'power off' in display power savings set to the same timeout as that for the screensaver to kick in, but that doesn't switch off the backlight too.

Comment 1 David Chamberlain 2009-01-19 00:27:46 UTC

I have a similar, possibly related problem:  when my power management kicks in, it does turn off the backlight, but about 4 seconds later it comes right back on.  The screen remains blank until I move the mouse.  

I tried issuing "xset dpms force off" and I got the exact same result.  I had no problem with this when using KDE 3.5.  I also tried this in a twm session and everything worked normally, so this is being caused by KDE 4.1 somehow.

Amit, can you check to see if you are getting this same behavior?  If you don't watch closely you can easily miss the 4 seconds when the backlight is actually off.  Of course your problem may be completely different; in which case, I should open a new bug.

Comment 2 David Chamberlain 2009-02-03 04:46:29 UTC

Update: If I disable kscreensaver, my backlight powers off normally and stays off.  So it seems that kscreensaver is causing the backlight to come back on about four seconds after it goes off.

Comment 3 Oren Held 2009-02-22 22:38:33 UTC

I think it's a dup of #165265, which was solved only on v4.2.1

Comment 4 Oswald Buddenhagen 2010-02-12 10:15:18 UTC

i venture the claim that oren is right.

*** This bug has been marked as a duplicate of bug 165265 ***