Binary package hint: xorg
My LED backlight flickers on a setting below 8 (min 0, max 15). On the lowest setting, this is rather extreme from really off to maybe the equivalent of ~3 to 4 within the fraction of a second. (I don't think this is healthy for the display, especially on a non-LED based backlight) The value of cat /sys/class/backlight/acpi_video0/actual_brightness stays constant. As it is so rapid and only visible in low-light conditions, it is impossible for me to capture a video of it. Brightness level of 1 and above shows less flickering, but still noticeable.
Another thing that might be related: Since about two weeks, the brightness control via Fn+Brightness up/down changes the setting in steps of 3, while it can be increased and decreased via cat or the KDE battery monitor in single steps right now. Before that, step size via Fn keys was also 1. A few days ago, I wasn't able to set the maximum level (even with the control applet), but instead needed to reboot.
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: xorg 1:7.6~3ubuntu11
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic x86_64
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: kwin
DRM.card0.DP.1:
status: disconnected
enabled: disabled
dpms: Off
modes:
edid-base64:
DRM.card0.DP.2:
status: disconnected
enabled: disabled
dpms: Off
modes:
edid-base64:
DRM.card0.DP.3:
status: disconnected
enabled: disabled
dpms: Off
modes:
edid-base64:
DRM.card0.HDMI.A.1:
status: disconnected
enabled: disabled
dpms: Off
modes:
edid-base64:
DRM.card0.HDMI.A.2:
status: disconnected
enabled: disabled
dpms: Off
modes:
edid-base64:
DRM.card0.LVDS.1:
status: connected
enabled: enabled
dpms: On
modes: 1440x900 1440x900
edid-base64: AP///////wAwrjZAAAAAAAASAQOAHhN46kuFkldWiiggUFQAAAABAQEBAQEBAQEBAQEBAQEBsCeggFGEGjAwIDYAML4QAAAZcCGgmFGEGjAwIDYAML4QAAAZAAAADwCVCjKVCigZGQAyDDwBAAAA/gBMUDE0MVdQMi1UTEIxAB8=
DRM.card0.VGA.1:
status: disconnected
enabled: disabled
dpms: Off
modes:
edid-base64:
Date: Sun Mar 6 00:51:33 2011
DistUpgraded: Log time: 2011-02-11 18:08:14.195705
DistroCodename: natty
DistroVariant: kubuntu
DkmsStatus:
tp-smapi, 0.40, 2.6.35-25-generic-phc, x86_64: installed (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!)
tp-smapi, 0.40, 2.6.38-5-generic, x86_64: installed
GraphicsCard:
Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device [17aa:20e4]
Subsystem: Lenovo Device [17aa:20e4]
MachineType: LENOVO 6475VAT
ProcEnviron:
LANGUAGE=
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.38-5-generic root=UUID=07994a0f-1d67-47e2-b6e8-ae65e7cfcf03 ro
Renderer: Unknown
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to natty on 2011-02-11 (22 days ago)
dmi.bios.date: 08/02/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 7UET89WW (3.19 )
dmi.board.name: 6475VAT
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:bvr7UET89WW(3.19):bd08/02/2010:svnLENOVO:pn6475VAT:pvrThinkPadT400:rvnLENOVO:rn6475VAT:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 6475VAT
dmi.product.version: ThinkPad T400
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.23-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1~git20110215.cc1636b6-0ubuntu2
version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu11
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
X no longer is in charge of power management for desktops, since a couple years; this is moved out to the desktop environment. On gnome, I'd point you to gnome-power-
Talk with the Kubuntu/KDE folks to find out what package in KDE is responsible for power settings, and then target this bug to that package. (Click the downward pointing arrow under 'Affects' and type the correct package name into the Package field.