lcd backlight doesn't shutdown when screen is locked

[Dario Panico]

when I lock my screen using the applet on the top-right corner the screen becomes black but the LCD backlight remains ON, so the screen keeps on wasting power, the backlight correctly decrease when I don't use the laptop for a while.

My laptop is an HP Pavilion dv8211eu (dv8000)

I haven't ever touched my xorg.conf file

ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/bin/evolution
Package: evolution 2.26.1-0ubuntu2
ProcEnviron:
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: evolution
Uname: Linux 2.6.28-15-generic x86_64

[Dario Panico (dariopnc-)]

bug still present in karmic

[SabreWolfy (sabrewolfy)]

Present in Karmic Release Candidate on Acer Aspire 4710. Screensaver / screen lock blacks screen, but backlight never goes off.

[Alvaro Kuolas (kuolas)]

Still an issue on Lucid (updated to this date). I have an HP 530: 945G + LVDS LCD Panel.

[Pedro Villavicencio (pedro)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. A new version of GNOME Power Manager is available on Maverick and we are wondering if this bug is still an issue for you with that version? Could you please test and comment back? Thanks in advance.

[Dario Panico (dariopnc-)]

bug still present in Maverick, the light goes off after some minutes

[hjaddadi (hjaddad)]

I'm having the same issue with 32-bit Ubuntu 10.10 on Acer Aspire 5100 (AMD Turion x2 & Radeon 200M). Screen goes blank but the backlight never turns off.

Command "xset dpms force off" works fine but the power manager just can't turn off the backlight no matter what settings I've tried. I've posted a thread on ubuntu forums about this too: http://ubuntuforums.org/showthread.php?t=1605571

[Dario Panico (dariopan)]

same problem happens even with an Acer Aspire TimeLineX and 10.10

[Dario Panico (dariopan)]

this still happens with 12.04...

is there any research on this issue?