How can I fix inaccurate brightness OSD notification issue?

Hi all,

Regarding the problem demonstrated in the animation below showing an inaccurate and not in regular steps applying OSD notification, how can I further identify whether this is:

  • a problem specific to my hardware Thinkpad X230
  • a bug in the Ubuntu MATE brightness handling package
  • or any other possible user error?

Thank you!

I’m not seeing anything like that on 16.04 running a dell-xps13.

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Going to go out on a limb here and assume it’s a framerate/refresh issue and purely cosmetic. Try changing compositors and/or disabling or enabling vsync. Think along those lines.

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Thanks for your help!

I could solve it by appending acpi_backlight=vendor to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" in /etc/default/grub.