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I upgraded my Lenovo ThinkPad T510 from Ubuntu 16.04 to 18.04.

At first the PC would freeze, but I fixed it with Ubuntu Bionic Beaver freezes randomly

Now, I can't adjust the screen brightness.

The output of sudo lshw -C display is:

  *-display                 
       description: VGA compatible controller
       product: GT218M [NVS 3100M]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       version: a2
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
       configuration: driver=nvidia latency=0
       resources: irq:34 memory:cc000000-ccffffff memory:d0000000-dfffffff memory:ce000000-cfffffff ioport:2000(size=128) memory:c0000-dffff

Update #1: @Raffa, here are the results:

ls -l /usr/share/X11/xorg.conf.d/
total 12
-rw-r--r-- 1 root root 1350 oct 21 09:26 10-quirks.conf
-rw-r--r-- 1 root root  945 abr 11  2018 40-libinput.conf
-rw-r--r-- 1 root root  149 nov 18 09:11 nvidia-drm-outputclass-ubuntu.conf

Update #2: Output of lspci | grep -i vga :

01:00.0 VGA compatible controller: NVIDIA Corporation GT218M [NVS 3100M] (rev a2)

Update #3: Hi @Raffa, I've created the new configuration file in /usr/share/X11/xorg.conf.d/ as you suggested and I can adjust the screen brightness now. Thanks a lot for helping me again.

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    Please edit your question and add the output of ls -l /usr/share/X11/xorg.conf.d/ – Raffa Apr 14 '20 at 18:01
  • Please also add the output of lspci | grep -i vga – Raffa Apr 14 '20 at 18:21
  • Well done and you are most welcome. – Raffa Apr 14 '20 at 21:57
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Please create and edit a new configuration file in /usr/share/X11/xorg.conf.d/ like so:

sudo nano /usr/share/X11/xorg.conf.d/10-nvidia-brightness.conf

Then, copy and paste the following into it:

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "Quadro NVS 3100M"
    Option         "RegistryDwords" "EnableBrightnessControl=1"
EndSection

Then, save the file and exit the editor by pressing Ctrl + x then press y then press Enter.

After that reboot your system and see if screen brightness adjusts now.

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The config-file /usr/share/X11/xorg.conf.d/10-nvidia-brightness.conf is working too for:

Thinkpad t410, Nvidia. After Upgrade from Ubuntu 18.04 to 20.04.

I had the same output for:

$ sudo lshw -C display

and

$ lspci | grep -i vga

and a comparable output for:

$ ls -l /usr/share/X11/xorg.conf.d/

Now brightness adjustment is possible via fn-key-combination and via the slider in the system-menu.

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