Sorry for the late reply. Can you try 18.04? Without any "acpi_osi=" parameter of course...
Also, please ask the vendor which device should control the brightness? I can see the PEGP's _BCM method reference to GFX0's _BCM, maybe it can only be called on GFX0 directly? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1751887 Title: The brightness of the screen cannot be adjusted with either the buttons or the slider. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1751887/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
