[i965gm] lcd backlight never stays off

Bug #423532 reported by Martin Pool on 2009-09-03
This bug affects 4 people
Affects Status Importance Assigned to Milestone
gnome-power-manager (Ubuntu)
xserver-xorg-video-intel (Ubuntu)

Bug Description

Binary package hint: xorg

I think this is different to bug 71368:

I have a thinkpad X61s running Karmic. If I run 'xset dpms force off' then the screen turns off properly. However, if I set in the power preferences that the screen should turn off after 5m, then it goes black but never shuts down the backlight.

ProblemType: Bug
Architecture: i386
Date: Thu Sep 3 15:09:37 2009
DistroRelease: Ubuntu 9.10
MachineType: LENOVO 76697DM
Package: xorg 1:7.4+3ubuntu5
 Socket 0:
   no product info available
 Socket 0:
   no card
ProcCmdLine: root=/dev/mapper/hostname-karmic_root ro quiet splash resume=/dev/mapper/hostname-swap_1
 PATH=(custom, user)
ProcVersionSignature: Ubuntu 2.6.30-9.10-generic
 xserver-xorg 1:7.4+3ubuntu5
 libgl1-mesa-glx 7.6.0~git20090817.7c422387-0ubuntu3
 libdrm2 2.4.12+git20090801.45078630-0ubuntu1
 xserver-xorg-video-intel 2:2.8.1-1ubuntu1
 xserver-xorg-video-ati 1:6.12.99+git20090629.f39cafc5-0ubuntu6
SourcePackage: xorg
Uname: Linux 2.6.30-9-generic i686

dmi.bios.date: 09/19/2007
dmi.bios.vendor: LENOVO
dmi.bios.version: 7NET27WW (1.08 )
dmi.board.name: 76697DM
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr7NET27WW(1.08):bd09/19/2007:svnLENOVO:pn76697DM:pvrThinkPadX61s:rvnLENOVO:rn76697DM:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 76697DM
dmi.product.version: ThinkPad X61s
dmi.sys.vendor: LENOVO
fglrx: Not loaded
 distro: Ubuntu
 architecture: i686kernel: 2.6.30-9-generic

Martin Pool (mbp) wrote :
Martin Pool (mbp) wrote :

I turns out that if I do 'dpms force off' then after a few minutes the backlight wakes up again.

I think this is a recent regression in karmic, or maybe I just haven't noticed...

Bryce Harrington (bryce) on 2009-09-03
affects: xorg (Ubuntu) → xserver-xorg-video-intel (Ubuntu)
Bryce Harrington (bryce) on 2009-09-03
Changed in xserver-xorg-video-intel (Ubuntu):
status: New → Confirmed
Geir Ove Myhr (gomyhr) wrote :

> ProcVersionSignature: Ubuntu 2.6.30-9.10-generic

Your Karmic kernel hasn't been updated since early June (see https://launchpad.net/ubuntu/+source/linux). Could you check if updating the kernel fixes this? The current version is 2.6.31-9.29.

Changed in xserver-xorg-video-intel (Ubuntu):
status: Confirmed → Incomplete
Martin Pool (mbp) wrote :

> Could you check if updating the kernel fixes this?

That's strange, my menu.lst wasn't updating for some reason when I installed new kernels. Running update-grub manually fixed it, and I rebooted into 2.6.31-9 (30 Aug) from today's Karmic updates. The problem is still present.

Changed in xserver-xorg-video-intel (Ubuntu):
status: Incomplete → Confirmed
Geir Ove Myhr (gomyhr) on 2009-09-07
tags: added: 965gm backlight karmic
Geir Ove Myhr (gomyhr) wrote :

> That's strange, my menu.lst wasn't updating for some reason when I installed new kernels.

I had the same behaviour with an early install of karmic. I thought it was because I also had windows and Jaunty on other partitions. Next time I installed karmic it started updating menu.lst after every new kernel.

I'm no expert on dpms issues, but since `xset dmps force off` works and whatever gnome-power-manager does doesn't work, I'm guessing that the bug may be within there. If not, those who know gnome-power-manager should be able to tell us what low level commands to try.

summary: - lcd backlight never stays off
+ [i965gm] lcd backlight never stays off
hgergo (hutongergo) wrote :

I think tis is power manager related too while i have the same problem with Ati x1100 !

I have the same issue with a Lenovo S10e (GPU i945gm). When the power manager blank the screen the backlight remains on. On the other hand running "xset dpms force off" the backlight go off.

Matt Drake (mattduckman) wrote :

confirming in gnome-power-manager since I see this issue on two computers, one with intel graphics, the other with ati. Also, #6 has this issue on an ati card as well.

Changed in gnome-power-manager (Ubuntu):
status: New → Confirmed
Nathan Crawford (njcrawford) wrote :

I see this issue on my Asus eeePC 900a. The video card is reported by lspci as an Intel 945GME.
It appears that the screen goes into DPMS sleep for about 1 second and then turns back on.

jbfoley (jbfoley) wrote :

This is happening on my HP HDX16 with Nvidia 9600M graphics. "xset dpms force off" shuts off the light for 30-60 seconds, then the backlight comes back on. This appears to be different from the earlier bug, because this function worked fine under 9.04

To post a comment you must log in.
This report contains Public information  Edit
Everyone can see this information.

Other bug subscribers