I have an answer that worked for me on Ubuntu 16.04, 18.04 and 20.04. Press Save in upper left corner, which will update GRUB for youįunny thing is, that code is exactly the same as in /usr/share/X11//nf, but that way it worked as expected! Sudo add-apt-repository ppa:danielrichter2007/grub-customizer
in terminal type sudo update-grub and press Enter. set to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=" ( acpi_osi= did it for me, other options didn't work.). add line Option "Backlight" "intel_backlight" after Driver "intel" (it doesn't really matter where, as long as it stays in Device Section). search for Section "Device" and then for Driver (on my PC it said Driver "intel" by default, but it could be something else, so change it to intel). navigate to /etc/X11/nf and open nf (in my case latest was nf.05312015) via leafpad (e.g. type sudo service lightdm start and press Enter(e.g. Start X Server (you can do it all without GUI via command line, but I was more comfortable with this aproach):. type sudo service lightdm stop and press Enter(e.g. Press Ctrl+ Alt+ F1 (Dont panic, while your Window system is runing, you can go back with Ctrl+ Alt+ F7). You need to kill your display manager, to create new nf file (because it runs X server):. Today I came to the solution, which is following: I've tried many GRUB options without effect, so I was googling again and again, coming back to solve this issue. I was using xbacklight option for some time, but it didn't satisfy me, as I knew it must be possible with Linux native way. Here is what I did, as I've been struggling with this for a long time.Ĭreating and modifying /usr/share/X11//nf file with the following lines. Thanks! echo 100 > /sys/class/backlight/intel_backlight/brightnessĮcho 100 > /sys/class/backlight/acpi_video0/brightness Maybe this a hardware problem?Īny ideas why this broke suddendly? I've upgraded from 12.04 to 14.04 in April and till yesterday the brightness keys were working fine. This is strange as the laptop came preinstalled with 12.04. Boot from a fresh Ubuntu 12.04 USB stick installation. 
Boot with kernel option i915.disable-pch_pwm=0.Set "load legacy option ROM" BIOS option to enabled and "secure boot" to disabled.Changing the brightness file in that folder does not help.
This resulted in a dell_something folder being present in the /sys/class/backlight folder. Boot with kernel option acpi_backlight=vendor.I tried the following to change the brightness This morning I found that I cannot change the brightness of my Dell XPs 13 laptop's display anymore.
0 kommentar(er)
