Ubuntu
gnome-power-manager package

Dark screen (no backlight or VERY low brightness) after wake up

Bug #155444 reported by ASDFASDF
20
This bug affects 2 people
Affects Status Importance Assigned to Milestone
acpi-support (Ubuntu)
Confirmed
Undecided
Unassigned
gnome-power-manager (Ubuntu)
Confirmed
Undecided
Unassigned
linux (Ubuntu)
Incomplete
Undecided
Unassigned
linux-source-2.6.22 (Ubuntu)
Won't Fix
Undecided
Unassigned

Bug Description

Binary package hint: gnome-power-manager

I am using Ubuntu 7.10 on Laptop HP Compaq 6710s (Core2Duo 2GHz, intel 965 graphics).
After wake up from suspend to ram, screen is very dark but I can see that there is something on screen... kind of like the backlight on the laptop didn't light up... so i put my password in, and only when I press a key to change brightnes screen lights up and is normal again (it is enough to press the button once).

If you need more information please ask because I am new and I don't know what log files do you need.

Revision history for this message
Mika Fischer (zoop) wrote :

I have the same problem on a Samsung Q45 (same graphics hardware).

Mika Fischer (zoop)
Changed in linux-source-2.6.22:
status: New → Confirmed
Revision history for this message
Malcolm Scott (malcscott) wrote :

Same on a HP 2510p (intermittently, possibly timing-dependent).

Matthew Garrett tells me that "you can work around it by adding a script to /etc/acpi/suspend.d that saves the value in /sys/class/backlight/whatever/brightness and one in resume.d that writes it back (do this after the video reinit stuff but before 65-console.sh)". Presumably it would be harmless to add such a script to the package to catch the various cases where this doesn't happen automatically.

Revision history for this message
ASDFASDF (user-487-deactivatedaccount) wrote :

Hmm, my /sys/class/backlight/acpi_video0/brightness is empty... so I guess that workaround wouldn't work.

Revision history for this message
Brian Murray (brian-murray) wrote :

I am assigning this bug to the 'ubuntu-kernel-team' per their bug policy. For future reference you can learn more about their bug policy at https://wiki.ubuntu.com/KernelTeamBugPolicies .

Changed in linux-source-2.6.22:
assignee: nobody → ubuntu-kernel-team
Revision history for this message
Alexander Hunziker (alex-hunziker) wrote :

Confirm this bug on a HP 6710b. Also for me it doesn't happen always, but oftentimes.

If somebody could post the workaround script, that would be great.

Revision history for this message
Maciej Strzelecki (mstrzele) wrote :

This bug also concerns the HP Compaq 6720s with Intel Graphics Media Accelerator X3100.

Revision history for this message
Denis (link011) wrote :

I have similar problem. hp6720s.
here is my quetion: https://answers.launchpad.net/ubuntu/+question/22545

Revision history for this message
Mika Fischer (zoop) wrote :

On my Samsung Q45 with Intel X3100 graphics I don't even have anything in: /sys/class/backlight/

Any other idea for a workaround?

Revision history for this message
Denis (link011) wrote :

seems to be no progress in this question....
In such situation i see 2 solutions.
1. try to update power manager ( in my case Kpowersave )
2. try to update to new kernel ( more probable solution )

Revision history for this message
Launchpad Janitor (janitor) wrote : This bug is now reported against the 'linux' package

Beginning with the Hardy Heron 8.04 development cycle, all open Ubuntu kernel bugs need to be reported against the "linux" kernel package. We are automatically migrating this bug to the new "linux" package. However, development has already began for the upcoming Intrepid Ibex 8.10 release. It would be helpful if you could test the upcoming release and verify if this is still an issue - http://www.ubuntu.com/testing . If the issue still exists, please update this report by changing the Status of the "linux" task from "Incomplete" to "New". We appreciate your patience and understanding as we make this transition. Thanks!

Revision history for this message
Launchpad Janitor (janitor) wrote : Kernel team bugs

Per a decision made by the Ubuntu Kernel Team, bugs will longer be assigned to the ubuntu-kernel-team in Launchpad as part of the bug triage process. The ubuntu-kernel-team is being unassigned from this bug report. Refer to https://wiki.ubuntu.com/KernelTeamBugPolicies for more information. Thanks.

Revision history for this message
Launchpad Janitor (janitor) wrote :

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

Changed in acpi-support (Ubuntu):
status: New → Confirmed
Changed in gnome-power-manager (Ubuntu):
status: New → Confirmed
To post a comment you must log in.
This report contains Public information  
Everyone can see this information.
Subscribing...

Other bug subscribers

Remote bug watches

Bug watches keep track of this bug in other bug trackers.