Public bug reported:
Backlight slider moves, and values updated in
/sys/class/backlight/intel_backlight/actual_brightness however,
backlight does not actually change.
Following https://wiki.ubuntu.com/Kernel/Debugging/Backlight attaching
results of the procedure.
Link to laptop in question:
** Attachment added: "acpidump.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170381/+files/acpidump.txt
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** Attachment added: "ssdt3.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170385/+files/ssdt3.dat
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** Attachment added: "ssdt8.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170391/+files/ssdt8.dat
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** Attachment added: "ssdt4.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170386/+files/ssdt4.dat
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** Attachment added: "ssdt7.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170390/+files/ssdt7.dat
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** Attachment added: "fwts"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170396/+files/fwts
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https://bugs.launchpad.net/bugs/1784878
Title:
** Attachment added: "dsdt.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170382/+files/dsdt.dat
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https://bugs.launchpad.net/bugs/1784878
** Attachment added: "grep -r . proc-acpi"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170379/+files/grep%20-r%20.%20proc-acpi
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** Attachment added: "ls sys-class-backlight"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170380/+files/ls%20sys-class-backlight
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** Attachment added: "acpi_backlight=vendor ls sys-class-backlight"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170415/+files/acpi_backlight%3Dvendor%20ls%20sys-class-backlight
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echo 8 > /sys/class/backlight/intel_backlight/brightness
Brightness did *not* change.
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https://bugs.launchpad.net/bugs/1784878
Title:
Backlight Not Functional - Origin
Boot with acpi_osi=
Brightness does *not* change, and no slider appears when using hotkeys.
Using the widget does not change brightness either.
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** Attachment added: "acpi_backlight=vendor ls -la
sys-class-backlight-intel-backlight"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170416/+files/acpi_backlight%3Dvendor%20ls%20-la%20sys-class-backlight-intel-backlight
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Boot with: video.use_bios_initial_backlight=0
Brightness did *not* change.
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Title:
Backlight Not Functional - Origin EVO 15-S
Tried both nvidia-driver-390 and nvidia-driver-396 (from graphics-
drivers PPA). Neither allow backlight to change upon reboot.
Not sure if this matters, but also tried switching to Intel with prime-
select, and after reboot still no luck.
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Boot with: video.use_bios_initial_backlight=0
Brightness does *not* change.
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https://bugs.launchpad.net/bugs/1784878
Title:
Backlight Not Functional - Origin EVO 15-S
Boot with: video.use_native_backlight=1
Brightness does *not* change.
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Title:
Backlight Not Functional - Origin EVO 15-S (Clevo)
Since I have both Intel and Nvidia graphics, tried adding
/usr/share/X11/xorg.conf.d/80-backlight.conf described in backlight
debugging procedure.
Brightness did *not* change after reboot (or before).
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** Attachment added: "ssdt12.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170395/+files/ssdt12.dat
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** Attachment added: "ssdt6.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170389/+files/ssdt6.dat
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** Attachment added: "powersave%0A"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170397/+files/powersave%250A
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** Attachment added: "ssdt11.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170394/+files/ssdt11.dat
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** Attachment added: "ssdt9.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170392/+files/ssdt9.dat
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** Attachment added: "userspace"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170398/+files/userspace
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** Attachment added: "ssdt10.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170393/+files/ssdt10.dat
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** Attachment added: "fwts method"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170399/+files/fwts%20method
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** Attachment added: "ssdt5.dat"
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** Attachment added: "ssdt2.dat"
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** Attachment added: "ssdt1.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170383/+files/ssdt1.dat
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** Attachment added: "results.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170400/+files/results.log
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** Attachment added: "dmidecode"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784878/+attachment/5170401/+files/dmidecode
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Tried 'acpi_osi=! acpi_osi="Windows 2009"' and brightness did not
change.
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https://bugs.launchpad.net/bugs/1784878
Title:
Backlight Not Functional - Origin EVO 15-S
Updated to 4.19-rc7 (uname -r = `4.19.0-041900rc7-generic`) with 'Ubuntu
Kernel Update Utility'. Without any boot parameters, brightness still
doesn't function (but UI shows it changing).
Are there any other things you want me to try on this kernel?
Unfortunately a lot of other things seemed to
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