[Samsung NP730U3E-S01PL] LCD backlight doesn't work

[bademux]

Backlight, no LCD, neither keyboard, doesn't work.

echo 1 > /sys/class/backlight/intel_backlight/brightness #nothig changes
echo 0 > /sys/class/backlight/intel_backlight/brightness #turns off LCD backlight

there is no /proc/sys/video/use_native_backlight

acpi_backlight =... # no effect at all

# grep . /sys/class/backlight/intel_backlight/*
/sys/class/backlight/intel_backlight/actual_brightness:8
/sys/class/backlight/intel_backlight/bl_power:0
/sys/class/backlight/intel_backlight/brightness:8
grep: /sys/class/backlight/intel_backlight/device: Jest katalogiem
/sys/class/backlight/intel_backlight/max_brightness:4650
grep: /sys/class/backlight/intel_backlight/power: Jest katalogiem
grep: /sys/class/backlight/intel_backlight/subsystem: Jest katalogiem
/sys/class/backlight/intel_backlight/type:raw

# dmesg|grep 'ACPI: Video'
[ 1.766081] ACPI: Video Device [PEGP] (multi-head: yes rom: no post: no)
[ 1.767014] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no

# lspci |grep VGA
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: linux-image-3.16.0-25-generic 3.16.0-25.33
ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
Uname: Linux 3.16.0-25-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: kasia 2021 F.... pulseaudio
Date: Sat Dec 6 00:16:19 2014
HibernationDevice: RESUME=UUID=aa9f54d4-8ed7-4e2b-9107-8ffa2b36e88e
InstallationDate: Installed on 2014-12-05 (0 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 730U3E/740U3E
ProcEnviron:
 LANGUAGE=pl
 TERM=xterm
 PATH=(custom, no user)
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
ProcFB:
 0 inteldrmfb
 1 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-25-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash acpi_backlight=vendor vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.16.0-25-generic N/A
 linux-backports-modules-3.16.0-25-generic N/A
 linux-firmware 1.138
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/26/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P07ABW.065.140226.dg
dmi.board.asset.tag: No Asset Tag
dmi.board.name: NP730U3E-S01PL
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: SEC_SW_REVISION_1234567890ABCD
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP07ABW.065.140226.dg:bd02/26/2014:svnSAMSUNGELECTRONICSCO.,LTD.:pn730U3E/740U3E:pvrP07ABW:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP730U3E-S01PL:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: 730U3E/740U3E
dmi.product.version: P07ABW
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

[Brad Figg (brad-figg)]

This change was made by a bot.

[bademux (bademux)]

ls /sys/class/backlight > backlight
grep -r . /proc/acpi > acpi
iasl -d DSDT.dat
fwts > fwts
fwts method > fwts_method
dmesg | grep 'ACPI: Video' > video
dmidecode > dmidecode.log
cat /proc/version > version

[penalvch (penalvch)]

bademux, thank you for reporting this and helping make Ubuntu better. Just to advise, in the future please do not compress/tar attachments as it makes it harder for developers and triagers to help you.

Despite this, could you please test the latest upstream kernel available from the very top line at the top of the page (the release names are irrelevant for testing, and please do not test the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue.

If the test did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested exactly shown as:
kernel-fixed-upstream-3.18-rc7

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description.

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding.

[bademux (bademux)]

can't attach multiple files to one post
attaching multiple ~20 filies will be the pain, sorry.
Reattaching zipped

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]

[bademux (bademux)]

ubuntu 15.04 - nothing changed

[Stefan Burnicki (stefan-burnicki)]

This bug also affects me. I also have a Samsung 730U3E notebook.
I just tested the upstream kernel 4.1-rc2 on vivid, and the problem still exists.

[Stefan Burnicki (stefan-burnicki)]

And please tell me what info you still need, I really want this to be fixed.

[penalvch (penalvch)]

Stefan Burnicki, if you really want this fixed, please file a new report via a terminal:
ubuntu-bug linux

Please feel free to subscribe me to it.

[bademux (bademux)]

Stefan Burnicki, please pay attention to MSDM bios section.
A bios dump file (don't remember wich one) contains your windows product key. Just grep for first 3-4 letters of you key and replace key with X .
http://superuser.com/a/593795

[Stefan Burnicki (stefan-burnicki)]

Filed that bug here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1454207

Bedmux, thanks for the hint. I will try to find out and correct this. But I don't use that key anyway.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]