I've found a solution for my case after a few days of despair.
It consists in using these options in /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux
acpi_backlight=video"
I have a Samsung laptop model NP470R4E running Ubuntu 16.10.
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I always find that setting acpi_backlight=None in /etc/default/grub and
then running sudo update-grub && sudo reboot will fix this problem with
Intel-based laptops quite easily.
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Brightness control also does not work on Samsung 730U3E.
I'm running 15.04 with 3.19.0-15 kernel and having the same symptoms as
reported and none of the listed kernel boot parameters show any effect.
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Giuseppe Scoppino and Stefan Burnicki - as you have different hardware
than the original reporter, you should file new bug reports. However,
it would probably be more productive to skip that step and file upstream
bug reports at https://bugzilla.kernel.org/
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Brightness still not working on the Samsung 780Z5E, I'd also suspect
770Z5E as well. There are no hardware differences between the 780Z5E and
880Z5E so it's probably just a case of adding these to
disable_native_backlight as well.
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This should be fixed in the upstream 3.19 kernel by this patch
author Aaron Lu
committer Rafael J. Wysocki
commit 7d0b93499f4879ddbc75d594f4ea216ba964f78e (patch)
tree 7c65587b844e6709d4301599e67505c9335de1cb
parent 97bf6af1f928216fd6c5a66e8a57bfa95a659672 (diff)
ACPI / video: Add some Samsung
if i add GRUB_CMDLINE_LINUX_DEFAULT=quiet splash acpi_osi=Windows on grub the
grightness will start on midle (50%)
then if i plug or un plug the prowe source it will go 100%
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same problem here on ativ book 8 2013..
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https://bugs.launchpad.net/bugs/1380824
Title:
Backlight not working on Samsung ATIV 8 laptop
To manage notifications about this bug go
tried upstream kernel and doesnt work
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https://bugs.launchpad.net/bugs/1380824
Title:
Backlight not working on Samsung ATIV 8 laptop
To manage notifications about this bug go to:
Same effect on my Samsung Ativ Book 7 (intel i7 intel/ati hybrid)
neither radeon, nor fglrx is working. Kernels 3.13.0-37, 3.16.0-23/24
don't work. Everything worked unter Xubuntu 14.04 (under 14.04
acpi_backlight=vendor even turned on brightness sensor) Under 14.10 ONLY
brightness sensor works
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.18 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel does not fix
Possible upstream bug:
https://bugzilla.kernel.org/show_bug.cgi?id=84561
** Bug watch added: Linux Kernel Bug Tracker #84561
http://bugzilla.kernel.org/show_bug.cgi?id=84561
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sudo fwts fwts
** Attachment added: sudo fwts fwts
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1380824/+attachment/4234969/+files/fwts
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sudo acpidump -o acpidump.txt
** Attachment added: sudo acpidump -o acpidump.txt
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1380824/+attachment/4234967/+files/acpidump.txt
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dmesg | grep 'ACPI: Video' video
** Attachment added: dmesg | grep 'ACPI: Video' video
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1380824/+attachment/4234973/+files/video
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sudo fwts fwts
sudo fwts method fwts_method
** Attachment added: results.log of fwts commands
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1380824/+attachment/4234971/+files/results.log
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results.log of 'sudo fwts fwts' command
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https://bugs.launchpad.net/bugs/1380824
Title:
Backlight not working on Samsung ATIV 8 laptop
To manage notifications about this bug go to:
acpixtract acpidump.txt
** Attachment added: acpixtract acpidump.txt
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1380824/+attachment/4234968/+files/acpidump.txt
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sudo dmidecode dmidecode.log
** Attachment added: sudo dmidecode dmidecode.log
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1380824/+attachment/4234974/+files/dmidecode.log
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$ ls /sys/class/backlight
intel_backlight
$ grep -r . /proc/acpi acpi
/proc/acpi/button/lid/LID0/state:state: open
/proc/acpi/wakeup:DeviceS-state Status Sysfs node
/proc/acpi/wakeup:P0P1S4*disabled
/proc/acpi/wakeup:USB1S3*disabled
/proc/acpi/wakeup:USB2S3
sudo lspci -vnvn lspci-vnvn.log
added.
** Attachment added: sudo lspci -vnvn lspci-vnvn.log
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1380824/+attachment/4234966/+files/lspci-vnvn.log
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$ cat /proc/version
Linux version 3.16.0-21-generic (buildd@panlong) (gcc version 4.9.1 (Ubuntu
4.9.1-16ubuntu4) ) #28-Ubuntu SMP Mon Oct 6 16:00:43 UTC 2014
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$ sudo dmidecode -s bios-version sudo dmidecode -s bios-release-date
P02ADH.008.130604.SK
06/04/2013
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https://bugs.launchpad.net/bugs/1380824
Title:
Backlight not working on Samsung
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