[Bug 573984] Re: Screen brightness can not be adjusted in Lucid with Intel Arrandale graphics

[saghaulor]

If I knew more about this stuff I'd be happy to hack a solution.
Unfortunately I do not. ConsequenltyI must rely on the mercy of our
community. Please help.

** Description changed:

  PROBLEM
  Hot keys for adjusting screen brightness do not work in Karmic or Lucid for Gateway NV59 laptop with Arrandale Graphics.
  Under Karmic, workaround was to adjust screen brightness while still in BIOS post.
  Karmic would boot with the selected screen brightness
  
  Under Lucid, screen brightness goes to 100% when booting, ignoring brightness set during boot.
  Hot keys for adjusting brightness do not work.
  
  RESULTS
  Tried the following:
  
  * Setting memory directly under /proc
  Results: memory for VGA brightness would change but display wouldn't actually change
  
  CHANGING BOOT PARAMETERS:
  
  # GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nolapic acpi_backlight=vendor"
  # above line doesn't solve problem
  # GRUB_CMDLINE_LINUX="acpi=off"
  # above line allows screen brightness but hyperthreading is off
  GRUB_CMDLINE_LINUX="acpi=ht"
  # above line allows screen brightness adjustment at cost of power, core temp?
  # GRUB_CMDLINE_LINUX="acpi_generic_hotkey"
  # above line doesn't solve screen brightness problem
  # GRUB_CMDLINE_LINUX="acpi=strict"
  # above line does not solve screen brightness problem
  # GRUB_CMDLINE_LINUX="acpi_osi=Linux"
  # above line does not solve screen brightness problem
  # GRUB_CMDLINE_LINUX="acpi=noirq"
  # above line doesn't solve
  # GRUB_CMDLINE_LINUX="acpi=noacpi"
  # above line does not allow screen brightness adjustment
  # GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
  # above line does not work
  # GRUB_CMDLINE_LINUX="i915.modeset=0"
  # above line make linux unbootable. Have to book off USB/CD and manually edit grub.conf
  
  BEST WORKAROUND
  GRUB_CMDLINE_LINUX="acpi=ht"
  # above line allows screen brightness adjustment at cost of power, core temp?
  
- 
- Linux tdlap6 2.6.32-21-generic #32-Ubuntu SMP Fri Apr 16 08:09:38 UTC 2010 x86_64 GNU/Linux
+ Linux tdlap6 2.6.32-21-generic #32-Ubuntu SMP Fri Apr 16 08:09:38 UTC
+ 2010 x86_64 GNU/Linux
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-21-generic 2.6.32-21.32
  Regression: Yes
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-21-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
  Architecture: amd64
  ArecordDevices:
-  **** List of CAPTURE Hardware Devices ****
-  card 0: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
-    Subdevices: 1/1
-    Subdevice #0: subdevice #0
+  **** List of CAPTURE Hardware Devices ****
+  card 0: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
+    Subdevices: 1/1
+    Subdevice #0: subdevice #0
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  tonydiep   1621 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  tonydiep   1621 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
-  Card hw:0 'Intel'/'HDA Intel at 0xf0800000 irq 22'
-    Mixer name	: 'Intel G45 DEVIBX'
-    Components	: 'HDA:10ec0272,1025033d,00100001 HDA:14f12c06,10250093,00100000 HDA:80862804,80860101,00100000'
-    Controls      : 26
-    Simple ctrls  : 13
+  Card hw:0 'Intel'/'HDA Intel at 0xf0800000 irq 22'
+    Mixer name	: 'Intel G45 DEVIBX'
+    Components	: 'HDA:10ec0272,1025033d,00100001 HDA:14f12c06,10250093,00100000 HDA:80862804,80860101,00100000'
+    Controls      : 26
+    Simple ctrls  : 13
  Date: Sun May  2 16:39:17 2010
  HibernationDevice: RESUME=/dev/sda5
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
  MachineType: Gateway NV59
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-21-generic root=UUID=53103199-f27c-4ef8-879c-bf122b4216fe ro acpi=ht quiet splash
  ProcEnviron:
-  LANG=en_CA.utf8
-  SHELL=/bin/bash
+  LANG=en_CA.utf8
+  SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.34
  RfKill:
-  0: phy0: Wireless LAN
-  	Soft blocked: no
-  	Hard blocked: no
+  0: phy0: Wireless LAN
+   Soft blocked: no
+   Hard blocked: no
  SourcePackage: linux
  dmi.bios.date: 11/26/2009
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: V1.09
  dmi.board.name: NV59
  dmi.board.vendor: Gateway
  dmi.board.version: Rev
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Gateway
  dmi.chassis.version: Rev
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrV1.09:bd11/26/2009:svnGateway:pnNV59:pvrRev:rvnGateway:rnNV59:rvrRev:cvnGateway:ct10:cvrRev:
  dmi.product.name: NV59
  dmi.product.version: Rev
  dmi.sys.vendor: Gateway

-- 
Screen brightness can not be adjusted in Lucid with Intel Arrandale graphics
https://bugs.launchpad.net/bugs/573984
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