backlight comes back on after screen is blaned and powered off

[Richard Bailey]

I am using 12.04 LTS (Lubuntu) on a Sony VAIO YB3V1E/S with AMD E-450.

If I tell xscreensaver to "quick power off the display in blank only mode", then when the screen is blanked, the backlight stays off only for a minute or two and then the backlight comes back on.

I am usigng the fglrx driver from the Ubuntu repository.

I think this is an X server bug because if I turn dpms off in the xorg.conf, and then ssh into the blanked machine and use vbetool to turn off the backlight, then it doesn't come back on by itself.

[Richard Bailey (bailey937)]

I did a fresh reinstall of lubuntu 12.04 LTS (64bit was 64bit before) and i could reprpduce it with the default radeon opensource driver but not with the proprietary fglrx from the repository.

[Richard Bailey (bailey937)]

It actually happens with fglrx, but I had to wait much longer.

[Richard Bailey (bailey937)]

I can't seem to get it to happen again (still using fglrx)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[fleamour (gtx-swift)]

Snap!

12.04 Xubuntu LTS AMD E-450 APU ThinkPad Edge E325, reproduced with open source driver.

[fleamour (gtx-swift)]

Oh... 64-bit also.

[penalvch (penalvch)]

Richard Bailey, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report:

apport-collect -p xorg-server REPLACE-WITH-BUG-NUMBER

Please note, given that the information from the prior release is already available, doing this on a release prior to the development one would not be helpful.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

[Launchpad Janitor (janitor)]

[Expired for xorg-server (Ubuntu) because there has been no activity for 60 days.]