[Ubuntu-x-swat] [Bug 1724933] Re: I can't adjust display brightness
Thank you for reporting this bug to Ubuntu. Ubuntu 17.10 (artful) reached end-of-life on July 19, 2018. See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in and change the bug status to Confirmed. ** Package changed: xorg (Ubuntu) => ubuntu ** Changed in: ubuntu Status: Confirmed => Won't Fix -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1724933 Title: I can't adjust display brightness To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1724933/+subscriptions ___ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
[Ubuntu-x-swat] [Bug 1724933] Re: I can't adjust display brightness
Thanks Neil! This method works fine. I hope someday somebody will fix it. In any case, I'll leave it here: Step 1: Fire a terminal (Obviously) Step 2: Finding the correct module. Run the following command: $ ls /sys/class/backlight/ This should list down two modules: acpi_video0 and intel_backlight We need to know which module is exactly controlling the brightness. Run the below command: (You need to be root) # tee /sys/class/backlight/acpi_video0/brightness <<< 5 If nothing happens, then intel_backlight is the one handling the brightness settings. Step 3: Modifying the bootloader. Next step is modifying the file /etc/default/grub. (Why modify /etc/default/grub and not /boot/grub/grub.cfg) # nano /etc/default/grub Insert the below four lines: GRUB_CMDLINE_LINUX="acpi_backlight=none" GRUB_CMDLINE_LINUX="acpi_backlight=video" GRUB_CMDLINE_LINUX="acpi_backlight=vendor" GRUB_CMDLINE_LINUX="acpi_backlight=native" After that save and close the file. (Root access needed) Run (as root): # update-grub Step 4: Reboot your system. Step 5: Verification After reboot, fire the terminal one last time and Run the following command: $ ls /sys/class/backlight/ 12 Voila acpi_video0 is gone! Check the fn+Brightness keys or change the brightness via the applet. Brightness controls should work just fine. Additional info: https://wiki.archlinux.org/index.php/Backlight -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1724933 Title: I can't adjust display brightness To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1724933/+subscriptions ___ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
[Ubuntu-x-swat] [Bug 1724933] Re: I can't adjust display brightness
This appears to be quite an old issue with Optimus graphics. For me the workaround was to pass specific kernel parameters at boot time to inhibit acpi control of the backlight but allow intel_backlight control I followed the instructions at https://nisheetlall.wordpress.com/2016/07/12/solved-brightness-fix-in-linux-for-optimus-laptops/ which worked first time for me. Your mileage may of course vary - it happens that I have exactly the same Lenovo Z570 laptop as the author of those instructions. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1724933 Title: I can't adjust display brightness To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1724933/+subscriptions ___ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
[Ubuntu-x-swat] [Bug 1724933] Re: I can't adjust display brightness
my laptop also has a graphics card with optimus -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1724933 Title: I can't adjust display brightness To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1724933/+subscriptions ___ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
[Ubuntu-x-swat] [Bug 1724933] Re: I can't adjust display brightness
I have the same problem using an ASPIRE 5750G-9463, using Optimus. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1724933 Title: I can't adjust display brightness To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1724933/+subscriptions ___ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
[Ubuntu-x-swat] [Bug 1724933] Re: I can't adjust display brightness
Status changed to 'Confirmed' because the bug affects multiple users. ** Changed in: xorg (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1724933 Title: I can't adjust display brightness To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1724933/+subscriptions ___ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
[Ubuntu-x-swat] [Bug 1724933] Re: I can't adjust display brightness
in X.org session adjustment not working -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1724933 Title: I can't adjust display brightness To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1724933/+subscriptions ___ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
[Ubuntu-x-swat] [Bug 1724933] Re: I can't adjust display brightness
in Unity session, the adjustment works fine -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1724933 Title: I can't adjust display brightness To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1724933/+subscriptions ___ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
