Comment 0 for bug 872652

I have been using Kamal Mostafa's kernels for my Dell Studio 15 for a few releases. Now, in oneiric, the brightness can not be changed unless I add acpi_backlight=vendor to the kernel command line. The brightness adjustment works fine when I make this change.

However, when I add this command line option, it introduces another issue where when the display goes to sleep, it does not resume.

Somtimes I get the screen back by switching to a console tty and then back to the X tty. But, the only reliable way I can get a screen to come back on is to close the laptop lid (so the system suspends) and then open it. The display will turn on for resume.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-3.0.0-12-generic 3.0.0-12.20
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: jrubin 3145 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf0a00000 irq 45'
   Mixer name : 'Intel IbexPeak HDMI'
   Components : 'HDA:111d7675,10280413,00100103 HDA:80862804,80860101,00100000'
   Controls : 20
   Simple ctrls : 11
Date: Tue Oct 11 22:09:44 2011
HibernationDevice: RESUME=UUID=ffe5b171-a88d-44b8-9f4e-bca222ce60bd
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427.1)
MachineType: Dell Inc. Studio 1558
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.0.0-12-generic root=/dev/mapper/hostname-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.0.0-12-generic N/A
 linux-backports-modules-3.0.0-12-generic N/A
 linux-firmware 1.60
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: Upgraded to oneiric on 2011-10-03 (8 days ago)
dmi.bios.date: 03/30/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A12
dmi.board.name: 0G939P
dmi.board.vendor: Dell Inc.
dmi.board.version: A12
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A12
dmi.modalias: dmi:bvnDellInc.:bvrA12:bd03/30/2011:svnDellInc.:pnStudio1558:pvrA12:rvnDellInc.:rn0G939P:rvrA12:cvnDellInc.:ct8:cvrA12:
dmi.product.name: Studio 1558
dmi.product.version: A12
dmi.sys.vendor: Dell Inc.