Max screen brightness differs depending on power status at boot

[Martin Thompson]

Binary package hint: xorg

If I boot with the mains connected my screen brightness can be adjusted from very bright to dim, but perfectly usable.

If I boot just on battery power, it varies from something similar to "dim but perfectly usable" as above to blank (backlight off)

I think I've seen that the BIOS sets the screen brightness at startup differently when booting with and without mains, so might that be setting what Ubuntu thinks is maximum brightness. For comparison, Win7 doesn't do this, the very bright setting is available both ways.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-25.45-generic 2.6.32.21+drm33.7
Uname: Linux 2.6.32-25-generic i686
NonfreeKernelModules: wl
Architecture: i386
Date: Wed Nov 24 20:51:58 2010
DkmsStatus:
 bcmwl, 5.60.48.36+bdcom, 2.6.32-21-generic, i686: installed
 bcmwl, 5.60.48.36+bdcom, 2.6.32-24-generic, i686: installed
 bcmwl, 5.60.48.36+bdcom, 2.6.32-23-generic, i686: installed
 bcmwl, 5.60.48.36+bdcom, 2.6.32-25-generic, i686: installed
 bcmwl, 5.60.48.36+bdcom, 2.6.32-22-generic, i686: installed
InstallationMedia: Ubuntu-Netbook 10.04 "Lucid Lynx" - Beta i386 (20100406.1)
MachineType: Hewlett-Packard HP Mini 5102
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-25-generic root=UUID=5948c4f9-eb12-4541-967c-d9e2f98e2b8d ro splash vga=771 quiet splash
ProcEnviron:
 PATH=(custom, user)
 LANG=en_GB.utf8
 SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
dmi.bios.date: 03/11/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68PGU Ver. F.05
dmi.board.name: 3653
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 43.1D
dmi.chassis.asset.tag: CNU01328DM
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68PGUVer.F.05:bd03/11/2010:svnHewlett-Packard:pnHPMini5102:pvr:rvnHewlett-Packard:rn3653:rvrKBCVersion43.1D:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP Mini 5102
dmi.sys.vendor: Hewlett-Packard
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro: Ubuntu
 codename: lucid
 architecture: i686
 kernel: 2.6.32-25-generic

[Pedro Villavicencio (pedro)]

Thanks for the report, it has been some time without any response or feedback in this bug report and we are wondering if this is still an issue for you with the latest release of Ubuntu the Natty Narwhal, May you please test with that version and comment back if you're still having or not the issue? Please have a look at http://www.ubuntu.com/download to know how to install that version.Thanks in advance and sorry for the late response.

[Martin Thompson (mjthompson)]

Now that I've managed to boot with max brightness available (if you turn the brightness up during the BIOS part of boot), it seems to be available to me all the time now. I think this one can be closed.

Thanks!

[Launchpad Janitor (janitor)]

[Expired for gnome-power-manager (Ubuntu) because there has been no activity for 60 days.]