[Kernel-packages] [Bug 1767504] Re: Dell XPS 15 9560 - No brightness control

** Attachment added: "lspci-vnvn.log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1767504/+attachment/5128913/+files/lspci-vnvn.log -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu.

[Kernel-packages] [Bug 1767504] [NEW] Dell XPS 15 9560 - No brightness control

Public bug reported: Hello, I have the problem that I cannot control the screen brightness on my XPS 15 9560 notebook. /sys/class/backlight is empty. I'm running latest Dell BIOS firmware 1.9.4. I tried all kinds of kernel parameters, such as acpi_osi and acpi_backlight, but without any effect.