You have been subscribed to a public bug: Brightness control is not working in GNOME and login manager (GDM). Also there is not any UI control to control brightness (or they are not showing to me), and keyboard buttons also does not work. The only way to set brightness is using xbacklight with elevated rights (sudo or as root).
Was not needed to set kernel parameters "acpi_osi=" neither "acpi_backlight=". I tested with each one of the kernel parameters and both at the same time to see if could work, but nothing changed. However, I installed KDE desktop to test if there brightness also cannot be easily set, and UI controls and hardware buttons worked as expected without needing to sudo it, unlike GNOME. However, brightness control under login manager SDDM (installed with KDE) also does not work. Brightness persists only within KDE, but not to booting screen. Setting brightness with xbacklight does not work under a non-GUI tty, but if I set it first within a GUI tty, then the non graphical tty keeps the brightness, but this setting does not persist across reboots. I do not know if it is a bug of Xorg, GNOME, or just related to drivers, but would be good to have functional brightness control out of the box without having to sudo xbacklight. I have installed Ubuntu 18.04 beta 2 and also installed the subsequent updates, so my system is up to date. My computer is a laptop HP Omen 15-ce0xx: * CPU: Intel® Core™ i7-7700HQ CPU @ 2.80GHz × 8 * GPU: Nvidia GeForce GTX 1060 with Max-Q Design * Storage: SSD NVME Samsung HDD SATA * Chipset Intel System is Ubuntu 18.04 64 bits Kernel version 4.15.0-20-generic Using NVIDIA proprietary drivers because with Nouveau drivers I had problems when resuming after suspend. If I recall correctly, this issue also happened with Nouveau. Please tell me if you need more information. ---- PS: I do not know if it is related, but I have read in a NVIDIA driver 387.22 (latest available in Ubuntu 18.04 and installed in my laptop is 390.48) release notes (http://www.nvidia.com/download/driverResults.aspx/126185/en-us) this: > Added an nvidia.ko kernel module parameter, NVreg_EnableBacklightHandler, > which can be used to > enable experimental handling of laptop backlight brightness through > /sys/class/backlight/. This > handler overrides the ACPI-based one provided by the video.ko kernel module. > > NVreg_EnableBacklightHandler is disabled by default. Could this be somehow related? ** Affects: ubuntu Importance: Undecided Status: New -- Brightness control not working in GNOME - Ubuntu 18.04 https://bugs.launchpad.net/bugs/1767001 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
