Just to add to the report by @manzood, this bug affects my variant of y540 as well. My complete laptop spec is as follows: Lenovo Legion Y540 NVIDIA GTX 2060 Mobile Ubuntu 18.04 kernel 5.4.0-72-generic
and again, the workaround suggested by @sureshot16 does not work, editing /sys/class/backlight/acpi_video0/brightness does not work(except when prime-select is set to intel), adding 'Option "RegistryDwords" "EnableBrightnessControl=1"' to /usr/share/X11/xorg.conf.d/10-nvidia-brightness.conf does not work neither does adding kernel parameters in grub config. This brightness issue has been a thorn in my side for the better part of a year, the only version which works is the Nouveau display driver installed via "Software & Updates" but has no CUDA support or Steam integration so that's a deal breaker for me. Unlike @manzood, suspending the laptop and resuming has never worked for me and causes artifacts and flickering in 460 specifically. Issue persists in 465 as well. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1905591 Title: no brightness control in {455,460} after update from 450 To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1905591/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
