Bug 5961 - Brightness keys (Fn+F5, Fn+F6) doesn't work on ASUS N751J
: Brightness keys (Fn+F5, Fn+F6) doesn't work on ASUS N751J
Product: Desktop Bugs
Classification: ROSA Desktop
Component: Hardware
: Fresh
: x86_64 Linux
: Normal normal
: ---
Assigned To: Groups for solving hardware issues.
: Eugene Shatokhin
Depends on:
  Show dependency treegraph
Reported: 2015-07-21 15:51 MSD by Eugene Budanov
Modified: 2015-08-20 18:55 MSD (History)
0 users

See Also:
RPM Package:
Bad POT generating:

baclight (17 bytes, application/octet-stream)
2015-08-20 16:32 MSD, Eugene Budanov
acpi log (1.06 KB, application/octet-stream)
2015-08-20 16:33 MSD, Eugene Budanov
dmidecode log (9.81 KB, text/x-log)
2015-08-20 16:44 MSD, Eugene Budanov
dsdt.dsl (688.42 KB, text/x-dsl)
2015-08-20 16:53 MSD, Eugene Budanov

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Description Eugene Budanov 2015-07-21 15:51:16 MSD
When I press buttons for changing brightness it doesn't work.

ACPI backlight working fine, I can easily change brighntess using power widget in KDE SC for example.

HW probe after pressing keys:  http://hw.rosalinux.ru/index.php?probe=6aa72e5950
Comment 1 Eugene Budanov 2015-08-20 16:32:38 MSD
Created attachment 4215 [details]
Comment 2 Eugene Budanov 2015-08-20 16:33:38 MSD
Created attachment 4216 [details]
acpi log
Comment 3 Eugene Budanov 2015-08-20 16:42:39 MSD
dmesg|grep 'ACPI: Video'
[    1.818851] ACPI: Video Device [PEGP] (multi-head: yes  rom: yes  post: no)
[    1.822038] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)

when try to use acpidump:

jarnvidr ~ # acpidump -o acpidump.txt
Linux version not implemented yet
Could not get ACPI tables, AE_SUPPORT

acpidump.txt is empty.
Comment 4 Eugene Budanov 2015-08-20 16:44:13 MSD
Created attachment 4217 [details]
dmidecode log
Comment 5 Eugene Budanov 2015-08-20 16:52:44 MSD
After updating acpica package I can make dump from ACPI table. All utilities runned on 4.1.6 kernel due bug #5962.

All programs was runned using this document: https://wiki.ubuntu.com/Kernel/Debugging/Backlight
Comment 6 Eugene Budanov 2015-08-20 16:53:17 MSD
Created attachment 4218 [details]
Comment 7 Eugene Budanov 2015-08-20 17:55:52 MSD
After adding grub option "acpi_backlight=vendor" backight is totally refuse to work. Returning back default backlight option.
Comment 8 Eugene Budanov 2015-08-20 18:55:39 MSD
After some experiments I found a workaround solution for this laptop. For activating backlight keys you need fix /etc/default/grub and add in the end of GRUB_CMDLINE_LINUX_DEFAULT line "acpi_osi=" option (without quotes).

Example: GRUB_CMDLINE_LINUX_DEFAULT='splash=silent logo.nologo acpi_osi='

Then run update-grub2 command under root user.