Samsung N210i915/Intel N10/:Screen stays black after resume + setting brightness won't work

[PeterPall]

Binary package hint: linux-image

On a fresh install of Ubuntu my new Samsung N210 plus netbook worked like magic with one exception:
If I close the lid it suspends or hibernates and if I open the lid again it is up in half a second - but the screen stays black.

Found a blog that told to try a

setpci -s 00:02.0 f4.b=<brightness>

(actually even if the writer of this blog did own the same netbook his graphics card was at a different pciid; Brightness ranges between 00 (off) and ff (full brightness). And since this change worked I added a file named

/etc/pm/sleep.d/99_LightsOn

with the following contents:

#!/bin/sh
case "$1" in
 resume|thaw)
  /usr/bin/setpci -s 00:02.0 f4.b=50
  ;;
esac

which resolved the case for me.

Since setting the brightness by the brightness keys won't work either and booting with the "noapic" or the "nolapic" option will lead to a complete black screen with backlight off, too, I assume it is a kernel bug. But feel free to reassign at will.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image (not installed)
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.37-9.23-generic 2.6.37-rc5
Uname: Linux 2.6.37-9-generic i686
NonfreeKernelModules: wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: gunter 1357 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf0400000 irq 43'
   Mixer name : 'Realtek ALC269'
   Components : 'HDA:10ec0269,144dc072,00100004'
   Controls : 13
   Simple ctrls : 8
Date: Fri Dec 17 07:26:26 2010
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=4e9ffcc5-917f-4d76-8fb2-3cd55b1e7186
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20101202)
MachineType: SAMSUNG ELECTRONICS CO., LTD. N150P/N210P/N220P
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 LC_MESSAGES=en_US.utf8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.37-9-generic root=UUID=0fe5168a-a771-4519-989f-ef7913db3e38 ro vt.handoff=7 quiet splash
RelatedPackageVersions: linux-firmware 1.42
RfKill:
 0: hci0: Bluetooth
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
StagingDrivers: brcm80211
Title: [STAGING]
dmi.bios.date: 04/30/2010
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 01KY.M008.20100430.RHU
dmi.board.asset.tag: SAMSUNG
dmi.board.name: N150P/N210P/N220P
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr01KY.M008.20100430.RHU:bd04/30/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnN150P/N210P/N220P:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnN150P/N210P/N220P:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A:
dmi.product.name: N150P/N210P/N220P
dmi.product.version: Not Applicable
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

[PeterPall (peterpall)]

A second piece off odd behaviour: If my N210 Plus blanks the screen after being idle for a certain time it manages to turn off the lights. But switching them on also needs the setpci mentioned above.

[PeterPall (peterpall)]

Found another post that handles this problem: http://ubuntuforums.org/showthread.php?p=9517612
...and another hint that the bug might be in the kernel: /sys/devices/virtual/backlight/acpi_video0/brightness
doesn't set the brightness.