@Erwin (erwin-gaubitzer-6)
Spot on - thank you.
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Title:
Backlight issue - Samsung Chronos 7 (model - NP770Z5E)
Status in linux
** Tags added: cscc
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Title:
Backlight issue - Samsung Chronos 7 (model - NP770Z5E)
Status in linux package in Ubuntu:
Confirmed
Thank you very much ~sigurof you just made my day!
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Title:
Backlight issue - Samsung Chronos 7 (model - NP770Z5E)
Status in linux
Hi, please try kernel in [1], without any "acpi*" kernel parameter.
[1] https://people.canonical.com/~khfeng/lp1485246
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Title:
I am also a Samsung Chronos 7 user on a fresh dual boot of Linux Mint
with Windows 10.
For me, a brightness bar appeared an moved according to me pressing Fn+F2/F3,
but the actual brightness would stay the same. If I pressed Fn+F2 until the
brightness bar was 0 the screen would turn off.
I
I just created an account to thank you, Erwin.
I've spent weeks going mad looking for a solution (no idea how I didn't
come across this), and your fix helped.
Note: My laptop's model is slightly different, NP780Z5E.
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I also have the NP770Z5E. What helped me was to change the grub kernel
boot parameter to
acpi_osi=linux acpi_backlight=video
in /etc/default/grub (line GRUB_CMDLINE_LINUX_DEFAULT=) (I have Debian Linux).
Hint was found at
The issue occurred on a fresh install of Ubuntu 15.04 but as I was
previously running 14.04, you could describe it as an upgrade (though it
was not through the upgrade mechanism). There was certainly a previous
kernel version where this was not causing a problem, but I am unable to
tell you which
Right, so I have re-tested having installed the 4.2.0-040200rc7-generic
kernel. The behaviour seems to be identical to the stock Ubuntu 15.04
kernel.
A few things I have noticed having carried out several reboots and
suspends in the process of testing this. These apply to both the stock
kernel
Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.2
Update: upon further reboots with acpi_backlight=vendor, trying to
adjust the brightness using the laptop hotkeys causes the brightness to
immediately descend to minimum levels and the brightness change
notification panel becomes locked.
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** Attachment added: fwts
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485246/+attachment/4445245/+files/fwts
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Title:
** Attachment added: results.log
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485246/+attachment/4445247/+files/results.log
** Description changed:
Control of screen backlight is broken with a default clean install of
- Ubuntu 15.04 on my Samsung Series 7 Laptop (NP770Z5E).
** Attachment added: dmidecode.log
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485246/+attachment/4445243/+files/dmidecode.log
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** Attachment added: fwts_method
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485246/+attachment/4445246/+files/fwts_method
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ls /sys/class/backlight backlight
** Attachment added: backlight
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485246/+attachment/4445242/+files/backlight
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acpidump output
** Attachment added: acpidump.txt
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485246/+attachment/4445216/+files/acpidump.txt
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** Attachment added: dsdt.dsl
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485246/+attachment/4445244/+files/dsdt.dsl
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