I have an update, after my post above, I checked manually if there were any updates.
sudo apt update apt list --upgradable I noticed that there was a new version of the kernel to be updated. 4.4.0-36-generic I have updated: sudo apt upgrade Restarted the computer the problem with brightness and gamma has disappeared. This behavior is normal. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1613359 Title: Xrandr gamma and brightness problem on 4.4.0-34 kernel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1613359/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
