Since I upgraded from Ubuntu 19.10 to 20.04 (Gnome 3.36.1), I have unfortunately had a few problems with the screen of my laptop (Clevo N151ZU, i7 8565U):
-I can no longer adjust the screen brightness using the keyboard (Fn + F8 / 9)
-I can no longer adjust the screen brightness via the menu on the top right (where you can also adjust the volume, for example (the option no longer appears)
-I can no longer change the screen brightness via the settings, the option no longer appears
-My laptop screen is only listed as "Unknown display" under Settings → Display devices
-There I can no longer set the Hz (option disappeared), as the selectable resolution is only 1920x1080 available
-xbacklight is installed, also using the commands xbacklight -set 0, xbacklight -set 100, etc. I can't change the brightness (nothing is output when I execute the commands. The screen brightness does not change either)
-If I close the laptop, it no longer goes into standby, although I have activated "Energy saving mode when the laptop cover is closed" in the Gnome Tweak tool under General
I get the error message when starting up:
i915: '' invalid for parameter 'enable_dpcd_backlight'
In the / etc / default / grub I tried in the GRUB_CMDLINE_LINUX_DEFAULT line with acpi_backlight = vendor and acpi_backlight = native (each with a sudo update-grub and a reboot afterwards), unfortunately without success.
Installing the xserver-xorg-video-intel package didn't help either.
A few system information:
glxinfo | grep "OpenGL core profile version string"
OpenGL core profile version string: 3.3 (Core Profile) Mesa 20.0.4
Settings → Info → Graphics: llvmpipe (LLVM 9.0.1, 256 bits)
ls / sys / class / backlight / does not print anything.
sudo find / sys / -type f -iname '* brightness *'
/ sys / devices / platform / i8042 / serio0 / input / input4 / input4 :: capslock / brightness
/ sys / devices / platform / i8042 / serio0 / input / input4 / input4 :: capslock / max_brightness
/ sys / devices / platform / i8042 / serio0 / input / input4 / input4 :: scrolllock / brightness
/ sys / devices / platform / i8042 / serio0 / input / input4 / input4 :: scrolllock / max_brightness
/ sys / devices / platform / i8042 / serio0 / input / input4 / input4 :: numlock / brightness
/ sys / devices / platform / i8042 / serio0 / input / input4 / input4 :: numlock / max_brightness
/ sys / devices / platform / tuxedo_keyboard / brightness
/sys/devices/pci0000:00/0000:00:1d.1/0000:3a:00.0/leds/phy0-led/brightness
/sys/devices/pci0000:00/0000:00:1d.1/0000:3a:00.0/leds/phy0-led/max_brightness
/ sys / module / video / parameters / hw_changes_brightness
/ sys / module / video / parameters / brightness_switch_enabled
/ sys / module / tuxedo_keyboard / parameters / brightness
Does anyone know further?
I would advise you to post that on the Ubuntu forum. Since Ubuntu 20.04 is relatively new, it can be a bug.
My first thought: This reads very much for missing (proprietary) drivers. Search with apt search firmware if you are missing a driver bundle.
In your other question, you describe the problem that apt means that packages / dependencies are missing. That could be related.
I was able to solve the problem with the defective packages of the other question. I had installed Blender from ner ppa and dependencies were out of date. Remove Blender, install packages with current dependencies, load Blender from the official package sources & that's it.
I have an Intel iGPU, proprietary drivers shouldn't be necessary (or aren't there at all).
The intel microcode is installed.
Okay good.
Do you have the possibility to create a live USB stick? Then boats that time and see if the backlight can be adjusted in live mode.
I will test with 20.04
Everything works there. Set screen brightness, Hz, resolution, etc.
In the Gnome settings, the screen is again shown as "built-in display".
What I noticed is:
With my installed Ubuntu 20.04 under Gnome Settings → Info → Graphics: llvmpipe (LLVM 9.0.1, 256 bits) but with the 20.04 Live System it says: Mesa Intel UHD Graphics 620 (WHL GT2). Does that mean anything?
The command "glxinfo" gives me something with "VMware" (I've even uninstalled the VMware Player). Something doesn't seem to be right there.
Yes, that looks like it. Do some research in this direction with a search engine. I don't know what to do with this specific problem. I would look for missing Linux firmware packages, but I don't know if that's the solution. As it reads, your Ubuntu thinks it runs in a VM. Very strange! If you have any questions, feel free to write me a message.
Another option is to reinstall your system. Depending on the configuration of the partitions, this can be done without losing personal data.
Thanks a lot.
Yes, I have both a complete image of my hard drive from before the upgrade (19.10), as well as corresponding backups of my home directory, all added PPAs, installed packages & changed system-wide config files.
The only thing that comes to my mind is that when I installed Lutris for dxvk & co I installed a few packages "relevant for the graphics driver". Maybe there's a problem somewhere.
I got it, that's because of the 5.4 kernel. I started the 5.3, everything works again.
I have the exact same problem with my dell inspiron 7577 still looking for solution
+1 with my HP EliteBook x360 830 G6
I have the same problem with my ASUS vivobook pro equipped with NVIDIA GTX 1050, I'm still looking for a solution
