[Samsung NF310] Backlight can only be set to min or max brightness

Bug #897378 reported by Seth Forshee
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Seth Forshee
Seth Forshee
Seth Forshee

Bug Description

== SRU Justification ==

Impact: On Samsung NF310 and other models, backlight adjustments do not work properly. The ACPI backlight interface doesn't work at all. The samsung-laptop driver sort of works, but the backlight can only be set to brightness levels 0, 1, and 8.

Fix: Upstream cherry pick to quirk brightness adjustments for these models.

Test Case: I've verified this personally on the NF310. Also verified to help on the N220P on LP #810093, although an additional patch is required to fully fix the issues on that machine.


When attempting to change the backlight level on this machine to anything other than the maximum or minimum brightness, the backlight level will continue to change in the direction of the adjustment until it reaches the maximum or minimum brightness. There are patches to fix this issue in kernel version 3.2.

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
NonfreeKernelModules: wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269VB Analog [ALC269VB Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269VB Analog [ALC269VB Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
 /dev/snd/controlC0: sforshee 1521 F.... pulseaudio
 Card hw:0 'Intel'/'HDA Intel at 0xf0400000 irq 47'
   Mixer name : 'Realtek ALC269VB'
   Components : 'HDA:10ec0269,144dc08c,00100100'
   Controls : 14
   Simple ctrls : 9
Date: Mon Nov 28 13:52:26 2011
HibernationDevice: RESUME=UUID=5ed9cd2d-6fd3-4b72-a595-4724f79b20e6
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110922)
 PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=efa8de0b-1647-4cb1-9f03-bb2b4da1637c ro quiet splash vt.handoff=7
 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: brcmsmac brcmutil
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/28/2010
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 03MY.M029.20101228.JIP
dmi.board.asset.tag: SAMSUNG
dmi.board.name: NF110/NF210/NF310
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.:bvr03MY.M029.20101228.JIP:bd12/28/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnNF110/NF210/NF310:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNF110/NF210/NF310:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A:
dmi.product.name: NF110/NF210/NF310
dmi.product.version: Not Applicable

Revision history for this message
Seth Forshee (sforshee) wrote :
Changed in linux (Ubuntu):
assignee: nobody → Seth Forshee (sforshee)
importance: Undecided → Medium
status: New → In Progress
Revision history for this message
Seth Forshee (sforshee) wrote :

Test build posted at:


Seems to be working well on my NF310.

Seth Forshee (sforshee)
description: updated
Changed in linux (Ubuntu):
status: In Progress → Fix Released
Tim Gardner (timg-tpi)
Changed in linux (Ubuntu Oneiric):
status: New → Fix Committed
assignee: nobody → Seth Forshee (sforshee)
Revision history for this message
Herton R. Krzesinski (herton) wrote :

This bug is awaiting verification that the kernel for Oneiric in -proposed solves the problem (3.0.0-15.24). Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-oneiric' to 'verification-done-oneiric'.

If verification is not done by one week from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: verification-needed-oneiric
Revision history for this message
Seth Forshee (sforshee) wrote :

Backlight works as expected on the NF310 using kernel version 3.0.0-15.24.

tags: added: verification-done-oneiric
removed: verification-needed-oneiric
Revision history for this message
Launchpad Janitor (janitor) wrote :
Download full text (13.9 KiB)

This bug was fixed in the package linux - 3.0.0-15.25

linux (3.0.0-15.25) oneiric-proposed; urgency=low

  [Brad Figg]

  * Release Tracking Bug
    - LP: #910894

  [ Upstream Kernel Changes ]

  * Revert "clockevents: Set noop handler in clockevents_exchange_device()"
    - LP: #904569

linux (3.0.0-15.24) oneiric-proposed; urgency=low

  [Herton R. Krzesinski]

  * Release Tracking Bug
    - LP: #903188

  [ Alex Bligh ]

  * (config) Change Xen paravirt drivers to be built-in
    - LP: #886521

  [ Chase Douglas ]

  * Revert "SAUCE: HID: hid-ntrig: add support for 1b96:0006 model"
    - LP: #724831
  * Revert "SAUCE: hid: ntrig: Remove unused device ids"
    - LP: #724831

  [ Seth Forshee ]

  * SAUCE: dell-wmi: Demote unknown WMI event message to pr_debug
    - LP: #581312

  [ Upstream Kernel Changes ]

  * Revert "leds: save the delay values after a successful call to
    - LP: #893741
  * xfs: Fix possible memory corruption in xfs_readlink, CVE-2011-4077
    - LP: #887298
    - CVE-2011-4077
  * drm/i915: fix IVB cursor support
    - LP: #893222
  * drm/i915: always set FDI composite sync bit
    - LP: #893222
  * jbd/jbd2: validate sb->s_first in journal_get_superblock()
    - LP: #893148
    - CVE-2011-4132
  * ALSA: hda - Don't add elements of other codecs to vmaster slave
    - LP: #893741
  * virtio-pci: fix use after free
    - LP: #893741
  * ASoC: Don't use wm8994->control_data in wm8994_readable_register()
    - LP: #893741
  * sh: Fix cached/uncaced address calculation in 29bit mode
    - LP: #893741
  * drm/i915: Fix object refcount leak on mmappable size limit error path.
    - LP: #893741
  * drm/nouveau: initialize chan->fence.lock before use
    - LP: #893741
  * drm/radeon/kms: make an aux failure debug only
    - LP: #893741
  * ALSA: usb-audio - Check the dB-range validity in the later read, too
    - LP: #893741
  * ALSA: usb-audio - Fix the missing volume quirks at delayed init
    - LP: #893741
  * KEYS: Fix a NULL pointer deref in the user-defined key type
    - LP: #893741
  * hfs: add sanity check for file name length
    - LP: #893741
  * drm/radeon: add some missing FireMV pci ids
    - LP: #893741
  * sfi: table irq 0xFF means 'no interrupt'
    - LP: #893741
  * x86, mrst: use a temporary variable for SFI irq
    - LP: #893741
  * b43: refuse to load unsupported firmware
    - LP: #893741
  * md/raid5: abort any pending parity operations when array fails.
    - LP: #893741
  * mfd: Fix twl4030 dependencies for audio codec
    - LP: #893741
  * xen:pvhvm: enable PVHVM VCPU placement when using more than 32 CPUs.
    - LP: #893741
  * xen-gntalloc: integer overflow in gntalloc_ioctl_alloc()
    - LP: #893741
  * xen-gntalloc: signedness bug in add_grefs()
    - LP: #893741
  * powerpc/ps3: Fix lost SMP IPIs
    - LP: #893741
  * powerpc: Copy down exception vectors after feature fixups
    - LP: #893741
  * backing-dev: ensure wakeup_timer is deleted
    - LP: #893741
  * block: Always check length of all iov entries in blk_rq_map_user_iov()
    - LP: #893741
  * Linux 3.0.10
    - LP: #893741
  * drm/i915: add multi-threaded forcewake support
    - LP: #891270
  * (pre-sta...

Changed in linux (Ubuntu Oneiric):
status: Fix Committed → Fix Released
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