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I know This has been asked to death. I have dealt with it before on other laptops.

And I have tried al these combinations in /et/default/grub and run a sudo update-grub reboot, test, fail.

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
GRUB_CMDLINE_LINUX="acpi_osi=Linux"

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="
GRUB_CMDLINE_LINUX=""

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor"
GRUB_CMDLINE_LINUX=""

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
GRUB_CMDLINE_LINUX=""

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
GRUB_CMDLINE_LINUX=""

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux"
GRUB_CMDLINE_LINUX=""

GRUB_CMDLINE_LINUX_DEFAULT="quiet video.use_native_backlight=1"
GRUB_CMDLINE_LINUX=""

GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi=strict"
GRUB_CMDLINE_LINUX=""

I tried creating a /usr/share/X11/xorg.conf.d/20-intel.conf source.

So what's next?

It's a HP Pavilion 15-cx0670nd.

  • Intel Core i7-8750H
  • GeForce GTX 1050 Ti
  • Intel Mobile HM370
janw
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  • This answer might be helpful: https://askubuntu.com/questions/1045624/how-to-switch-between-options-in-sys-class-backlight-to-solve-brightness-prob/1045763#1045763 – WinEunuuchs2Unix Apr 04 '19 at 23:16

1 Answers1

0

I own the same model laptop and also experience this issue. Nothing seemed to work ..

Today I installed Ubuntu 19.04 to a USB stick and the function keys for the brightness worked out of the box! However, when I upgraded my Ubuntu 18.04 to 19.04 it did not work, neither did installing a 'clean' 19.04 over my upgraded version.

Since my clean USB installation of 19.04 did work you might want to give that a shot.

Edit: Seems to be working on my upgraded version as well now.

TotalKnob
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  • Does your SD card reader work under Ubuntu? Because that also is not working. Also can you share the content of your /et/default/grub file? – janw Apr 20 '19 at 14:49
  • Just installed clean on my primary ssd, works fine as well. All I did was:

    Install Ubuntu 19.04 (with third-party software enabled), once booted enable Canonical Partners repository, sudo apt update && sudo apt full-upgrade, reboot

     – TotalKnob May 31 '19 at 12:46
  • After another reinstall I noticed that the brightness issue might be caused by iio-sensor-proxy being faulty or missing. You might want to try sudo apt-get remove iio-sensor-proxy (reboot) sudo apt-get install iio-sensor-proxy (reboot)

    fyi: The SD card reader does not work under linux, apparently nobody has a working driver for this specific one.

     – TotalKnob Jun 05 '20 at 17:57
  • Yeah, the SD-card also doesn't work. I've just accepted that it doesn't work.. – janw Jun 07 '20 at 18:35