I'm running Manjaro KDE.
My laptop is being like Paula Abdul saying "You can only have One or the Other". Spoiler alert, if you know what this means, I'm sorry to tell you but you are old!
So, the four acpi_backlight grub options are video, vendor, native and none.
If I set "video", "native" or "none", the brightness (backlight) works, including the fn+F5 and fn+F6 keys to incrase and decrease brightness levels. But the fn+F7 key for turning off the screen does not work as expected and locks the screen instead, not turning it off.
If I set it to "vendor" in the grub, the brightness (backlight) stops working, but the screen turning off key fn+F7 works just fine.
Is there a way I can have both working?
System: Host: pemartins-X55U Kernel: 4.19.36-1-MANJARO x86_64 bits: 64 Desktop: KDE Plasma 5.15.4 Distro: Manjaro Linux Machine: Type: Laptop System: ASUSTeK product: X55U v: 1.0 serial: <filter> Mobo: ASUSTeK model: X55U v: 1.0 serial: <filter> UEFI: American Megatrends v: X55U.423 date: 08/06/2013 CPU: Topology: Dual Core model: AMD E2-1800 APU with Radeon HD Graphics bits: 64 type: MCP L2 cache: 512 KiB Speed: 1348 MHz min/max: 850/1700 MHz Core speeds (MHz): 1: 1348 2: 1548 Graphics: Device-1: AMD Wrestler [Radeon HD 7340] driver: radeon v: kernel Display: x11 server: X.Org 1.20.4 driver: radeon FAILED: ati unloaded: modesetting resolution: 1366x768~60Hz OpenGL: renderer: AMD PALM (DRM 2.50.0 / 4.19.36-1-MANJARO LLVM 8.0.0) v: 3.3 Mesa 19.0.3 Audio: Device-1: AMD Wrestler HDMI Audio driver: snd_hda_intel Device-2: AMD FCH Azalia driver: snd_hda_intel Sound Server: ALSA v: k4.19.36-1-MANJARO Network: Device-1: Ralink RT5390 Wireless 802.11n 1T/1R PCIe driver: rt2800pci IF: wlp1s0 state: up mac: <filter> Device-2: Qualcomm Atheros AR8161 Gigabit Ethernet driver: alx IF: enp2s0 state: down mac: <filter> IF-ID-1: ifb0 state: unknown speed: N/A duplex: N/A mac: <filter> Drives: Local Storage: total: 465.76 GiB used: 259.60 GiB (55.7%) ID-1: /dev/sda vendor: Seagate model: ST500LM012 HN-M500MBB size: 465.76 GiB Partition: ID-1: / size: 17.23 GiB used: 14.36 GiB (83.4%) fs: ext4 dev: /dev/sda10 ID-2: swap-1 size: 3.59 GiB used: 37.0 MiB (1.0%) fs: swap dev: /dev/sda6 Sensors: System Temperatures: cpu: 68.0 C mobo: N/A gpu: radeon temp: 67 C Fan Speeds (RPM): cpu: 3500 Info: Processes: 174 Uptime: 2h 30m Memory: 3.45 GiB used: 2.29 GiB (66.4%) Shell: xterm inxi: 3.0.33