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Bug #780625 ""acpi_backlight=vendor” needs to be present in kern ...
https://bugs.launchpad.net/bugs/780625
May 10, 2011 - On my laptop I had to add "acpi_backlight=vendor" into kernel cmdline to get working backlight. This state is since beginning (10.04 + maverick kernels during uds-m). If I remove that argument then /sys/class/backlight/acpi_video0/ is created instead of 'asus_laptop' one and changing backlight by hardware ...Bug #1485246 “Backlight issue - Samsung Chronos 7 (model - NP770 ...
https://bugs.launchpad.net/bugs/1485246
Aug 15, 2015 - 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 'Bug #1516370 “Vendor backlight on Lenovo Z580 having random ...
https://bugs.launchpad.net/bugs/1516370
Nov 15, 2015 - I've taken a bold guess in the title of this bug. While investigating why on 14.04 LTS, I have working backlight on the latest 3.13 kernel, but not on the 3.16, I tried acpi_backlight=vendor. With default boot parameters, I just get /sys/class/Bug #1537324 “No brightness control on Samsung NP530U4E ...
https://bugs.launchpad.net/bugs/1537324
Jan 23, 2016 - Backlight control does not work, but there are entries in /sys/class/backlight. Laptop model: NP530U4E-K01RU Video adapter: Intel HD graphics 4000 I've tried all the suggestions from https://wiki.ubuntu.com/Kernel/Debugging/Backlight kernel parameters acpi_backlight=vendor, ...Bug #974806 “/sys/class/backlight/ empty on Acer Aspire One D270 ...
https://bugs.launchpad.net/bugs/974806
Apr 6, 2012 - I tested it with the following values for COMMANDLINE_LINUX in the grub settings: "acpi_backlight=vendor" "acpi_osi=Linux acpi_backlight=vendor" "Bug #1624234 “Changing backlight doesn't work in Gnome” : Bugs ...
https://bugs.launchpad.net/bugs/1624234
Sep 16, 2016 - thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor thinkpad-acpi.Bug #1486896 “On Lenovo Thinkpad Edge E330, the screen backlight ...
https://bugs.launchpad.net/bugs/1486896
Aug 20, 2015 - Behavior is the same on Ubuntu 14.04 -- 15.04. Steps were taken according to this: https://wiki.ubuntu.com/Kernel/Debugging/Backlight With acpi_backlight=Bug #1309584 “[HP EliteBook Folio 9470m Notebook PC] Backlight d ...
https://bugs.launchpad.net/bugs/1309584
[HP EliteBook Folio 9470m Notebook PC] Backlight does not work on intel driver after upgrade from 13.10 -> 14.04, acpi_backlight=vendor solves. Bug #1309584 reported by Clint Byrum on 2014-04-18. 6. This bug affects 1 person ...Bug #1535470 “Backlight brightness keys not working” : Bugs : linux ...
https://bugs.launchpad.net/bugs/1535470
Jan 18, 2016 - I have tried various combinations of: acpi_osi=Linux acpi_backlight=native acpi_osi=Linux acpi_backlight=vendor acpi_osi=! acpi_backlight=vendor etc, etc. with no luck. --- ApportVersion: 2.19.1-0ubuntu5. Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ian ...Bug #1181660 “PowerDevil selects the incorrect brightness interf ...
https://bugs.launchpad.net/bugs/1181660
May 19, 2013 - I upgraded to Kubuntu 13.04, and my brightness keys will not select the correct interface. This worked fine in Kubuntu 12.10, if I put "acpi_backlight=vendor" in the grub options. Now, when /etc/default/grub contains GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor" /sys/class/