https://bugzilla.kernel.org/show_bug.cgi?id=198907 Manuel (m.linsmayer@xxxxxxxxxxxxx) changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |m.linsmayer@xxxxxxxxxxxxx --- Comment #6 from Manuel (m.linsmayer@xxxxxxxxxxxxx) --- Hello! I have a very similar situation, in my opinion. I'm running kernel 4.15.0-20, my distro is Kubuntu 18.04, my hardware is a Dell XPS 15 9560 running with latest firmware (1.9.4) in UEFI mode. /sys/class/backlight is also empty for me. I have an Intel 591B as well as an discrete NVIDIA GeForce GTX 1050. Situation is the same, no matter whether I'm using Intel or NVIDIA graphics. I'm also getting ACPI errors at startup. [ 0.000000] ACPI: Core revision 20170831 [ 0.000000] ACPI Error: [\_SB_.PCI0.XHC_.RHUB.HS11] Namespace lookup failure, AE_NOT_FOUND (20170831/dswload-210) [ 0.000000] ACPI Exception: AE_NOT_FOUND, During name lookup/catalog (20170831/psobject-252) [ 0.000000] ACPI Exception: AE_NOT_FOUND, (SSDT:xh_rvp11) while loading table (20170831/tbxfload-228) [ 0.000000] ACPI Error: 1 table load failures, 12 successful (20170831/tbxfload-246) I'm able to see ACPI events when pressing brightness down/up buttons: 9DBB5994-A997-11� 000000d0 00000000 video/brightnessdown BRTDN 00000087 00000000 K 9DBB5994-A997-11� 000000d0 00000000 video/brightnessup BRTUP 00000086 00000000 K I played around with acpi_osi and acpi_backlight, but this doesn't change anything. Manuel -- You are receiving this mail because: You are watching the assignee of the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
