I file this bug on:
https://bugzilla.kernel.org/show_bug.cgi?id=199701
https://bugs.freedesktop.org/show_bug.cgi?id=106869
** Bug watch added: Linux Kernel Bug Tracker #199701
https://bugzilla.kernel.org/show_bug.cgi?id=199701
** Bug watch added: freedesktop.org Bugzilla #106869
Ok! Thanks kaihengfeng! I'll do it.
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Title:
Backlight does not work on a MacBookAir3,2
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Please file an upstream bug at https://bugzilla.kernel.org/
Product: ACPI
Component: Power-Video
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Title:
Backlight does not work on a
Thanks Kaihenfeng! I try it from [2], but /sys/class/backlight still
empty. Ops! ...
[2] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.17-rc3/
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This commit [1] might solve it. Can you git it a try?
[1]
https://github.com/torvalds/linux/commit/53fa1f6e8a5958da698a31edf366ffe90596b490
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Again, I test the 4.16 kernel with the parameter "nomodese". As Kaihengfeng
guessed the system boot but the problem still there; /sys/class/backlight
folder was empty. My second test was boot again with 4.16 without "nomodeset"
parameter in the grub file and the results were others. As I
Today I reinstalled my laptop with a Ubuntu 17.10 and the system show
the same problem. When the first boot finised I looked for the files on
the /sys/class/backlight folder but this folder was empty. I changed
/etc/default/grub with GRUB_CMDLINE_LINUX_DEFAULT="nomodeset
acpi_backlight=vendor" as
I guess you can avoid the issue by using kernel parameter "nomodeset"
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Title:
Backlight does not work on a MacBookAir3,2
To manage
Because, the system boot up but it stops and freezes due to problem with
(nouveau) graphics. When the system is frozen it still allows me to test the
brightness keys. Unfortunately with the frozen system I can not access a
terminal or use it in any way.
(Sorry for my painful use of the
I don't quite understand. If you can't boot under v4.16, how did you
test it?
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Title:
Backlight does not work on a MacBookAir3,2
To manage
I've test the latest v4.16 with this errors during installation:
[...]
dpkg: problemas de dependencias impiden la configuración de
linux-headers-4.16.0-041600-generic:
linux-headers-4.16.0-041600-generic depende de linux-headers-4.16.0-041600;
sin embargo:
El paquete
acpi_osi=Linux is not necessary.
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Title:
Backlight does not work on a MacBookAir3,2
To manage notifications about this bug go to:
Yes kaihengfeng. Now, my GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=Linux
acpi_backlight=vendor" and /sys/class/backlight still empty. Today I've
updated the laptop and the kernel is 4.13.0-38-generic and the problem
still happening.
I hope in this week, I can change my kernel to test this solution.
Yes jsalisbury, this issue started happening after an upgrade. Sorry, I'm not
sure ... from 16.10 to 17.4 could be ...
Ok, many thanks. I have not enought time, but I'll try to test the latest
upstream kernel.
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When you use "acpi_backlight=vendor", is /sys/class/backlight still
empty?
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Title:
Backlight does not work on a MacBookAir3,2
To manage
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
v4.16
acpixtract acpidump.txt
iasl -d DSDT.dat
** Attachment added: "iasl -d DSDT.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1758496/+attachment/5088858/+files/dsdt.dsl
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** Attachment added: "sudo fwts > fwts"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1758496/+attachment/5088859/+files/fwts
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Title:
** Attachment added: "sudo fwts method > fwts_method"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1758496/+attachment/5088860/+files/fwts_method
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** Attachment added: "sudo dmidecode > dmidecode.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1758496/+attachment/5088861/+files/dmidecode.log
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The output of: ls /sys/class/backlight > backlight is nothing
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Title:
Backlight does not work on a MacBookAir3,2
To manage notifications about
** Attachment added: "grep -r . /proc/acpi > acpi"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1758496/+attachment/5088845/+files/acpi
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** Attachment added: "sudo acpidump -o acpidump.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1758496/+attachment/5088846/+files/acpidump.txt
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