Public bug reported:
Control of screen backlight is broken with a default clean install of
Ubuntu 15.04 on my Samsung Series 7 Laptop (NP770Z5E). Setting kernel
parameter 'acpi_backlight=vendor' fixes the issue after two reboots.
Debugging information attached as per -
https://wiki.ubuntu.com/Kern
** 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). Setti
** 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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https://bugs.launchpad.net/bugs/148
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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ht
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: "fwts"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485246/+attachment/4445245/+files/fwts
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Title:
** Attachment added: "dsdt.dsl"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485246/+attachment/4445244/+files/dsdt.dsl
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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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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 i
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 and
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