Issue with laptop brightness (backlight) and turn off screen fn keys

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! :grin:

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?

Laptop info:

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

Have a read here
https://bbs.archlinux.org/viewtopic.php?id=231490

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