Screen brightness on MacBookPro7,1 goes below 100% immediately after gdm login

[Mohamed Amine Ilidrissi]

Binary package hint: xorg

What happens in order:
1. The computer is booted (MacBookPro 7,1).
2. When arriving to the gdm login, I can notice the brightness is at its maximum. Trying to lower the brightness doesn't do anything (but it shows the notification, so it's not a hotkey issue).
3. Immediately after typing my password, the brightness goes brutally down to ~40% (just a guess). When trying to change it back to 100% (either with the hotkeys or the brightness applet), I find that the "new" 100% is lower than the "previous" 100%. That means I can't change it back to 100%.

Please tell me if you need more information.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: xorg 1:7.5+6ubuntu3
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic-pae 2.6.35.4
Uname: Linux 2.6.35-22-generic-pae i686
NonfreeKernelModules: wl
Architecture: i386
DRM.card0.DisplayPort.1:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes:
 edid-base64:
DRM.card0.LVDS.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1280x800 1024x768 800x600 640x480 720x400 640x400 640x350
 edid-base64: AP///////wAGEMOcAAAAABwTAQOAHRJ4CgAAAAAAAAAAUFQAAAABAQEBAQEBAQEBAQEBAQEBUhwAj1AgLjAwIDYAHrMQAAAYAAAAAQAGECAAAAAAAAAAAAogAAAA/gBMUDEzM1dYMy1UTEEzAAAA/gBDb2xvciBMQ0QKICAgAA==
Date: Sun Oct 10 21:33:13 2010
DkmsStatus: bcmwl, 5.60.48.36+bdcom, 2.6.35-22-generic-pae, i686: installed
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
MachineType: Apple Inc. MacBookPro7,1
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic-pae root=UUID=488c9b59-cb23-4868-8913-7ffb7ef88d09 ro quiet splash
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: xorg
dmi.bios.date: 03/25/10
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP71.88Z.0039.B05.1003251322
dmi.board.name: Mac-F222BEC8
dmi.board.vendor: Apple Inc.
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-F222BEC8
dmi.modalias: dmi:bvnAppleInc.:bvrMBP71.88Z.0039.B05.1003251322:bd03/25/10:svnAppleInc.:pnMacBookPro7,1:pvr1.0:rvnAppleInc.:rnMac-F222BEC8:rvr:cvnAppleInc.:ct10:cvrMac-F222BEC8:
dmi.product.name: MacBookPro7,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro: Ubuntu
 codename: maverick
 architecture: i686
 kernel: 2.6.35-22-generic-pae

[Vladimir (sadchitananda-aol)]

Bug affects me too

[Vladimir (sadchitananda-aol)]

As temporary solution you can uncheck "Reduce backlight brightness" and "Dim display when idle" options in power management in "On battery power" tab.

[bugbot (bugbot)]

Hey Mohamed,

Hi, have you had a chance to test if this bug is still present in natty?

If it does (and if you're the original reporter), please boot into natty
and run the command:

  apport-collect <bug-number>

which will update the bug with fresh logs and tag the bug as affecting
natty. (It is best to run this right after reproducing the problem.)

[bugbot (bugbot)]

We're closing this bug since it is has been some time with no response from the original reporter. However, if the issue still exists please feel free to reopen with the requested information. Also, if you could, please test against the latest development version of Ubuntu, since this confirms the bug is one we may be able to pass upstream for help.