Merhaba son güncelleme ile beraber ekran parlaklığını ayarlayamama sorunu başgösterdi. Çözüm önerilerine açığım, teşekkürler.

inxi -F çıktısı;

System:    Host: qwe Kernel: 4.19.36-1-MANJARO x86_64 bits: 64 Desktop: KDE Plasma 5.15.4 
           Distro: Manjaro Linux 
Machine:   Type: Laptop System: Casper Bilgisayar Sistemleri A.S product: Casper Nirvana Notebook v: 1.0 
           serial: <root required> 
           Mobo: Casper Bilgisayar Sistemleri A.S model: Casper Nirvana Notebook serial: <root required> 
           UEFI: Phoenix v: 1.00.00.CA date: 08/24/2013 
Battery:   ID-1: BAT0 charge: 19.4 Wh condition: 19.4/47.5 Wh (41%) 
CPU:       Topology: Quad Core model: Intel Core i7-4702MQ bits: 64 type: MT MCP L2 cache: 6144 KiB 
           Speed: 908 MHz min/max: 800/3200 MHz Core speeds (MHz): 1: 921 2: 984 3: 1040 4: 813 5: 875 
           6: 1202 7: 829 8: 822 
Graphics:  Device-1: Intel 4th Gen Core Processor Integrated Graphics driver: i915 v: kernel 
           Device-2: NVIDIA GK208M [GeForce GT 740M] driver: nouveau v: kernel 
           Display: x11 server: X.Org 1.20.4 driver: intel,nouveau unloaded: modesetting tty: N/A 
           OpenGL: renderer: Mesa DRI Intel Haswell Mobile v: 4.5 Mesa 19.0.3 
Audio:     Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor HD Audio driver: snd_hda_intel 
           Device-2: Intel 8 Series/C220 Series High Definition Audio driver: snd_hda_intel 
           Sound Server: ALSA v: k4.19.36-1-MANJARO 
Network:   Device-1: Ralink RT3290 Wireless 802.11n 1T/1R PCIe driver: rt2800pci 
           IF: wlp3s0f0 state: down mac: 
           Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8168 
           IF: enp4s0 state: down mac: 
           Device-3: Qualcomm Atheros AR9271 802.11n type: USB driver: ath9k_htc 
           IF: wlp0s20u2 state: up mac: 
Drives:    Local Storage: total: 931.52 GiB used: 46.03 GiB (4.9%) 
           ID-1: /dev/sda vendor: Toshiba model: MQ01ABD075 size: 698.64 GiB 
           ID-2: /dev/sdb vendor: Samsung model: SSD 850 EVO 250GB size: 232.89 GiB 
Partition: ID-1: / size: 232.38 GiB used: 23.59 GiB (10.2%) fs: f2fs dev: /dev/sdb2 
Sensors:   System Temperatures: cpu: 56.0 C mobo: N/A gpu: nouveau temp: 55 C 
           Fan Speeds (RPM): N/A 
Info:      Processes: 216 Uptime: 5m Memory: 7.54 GiB used: 1.78 GiB (23.6%) Shell: bash inxi: 3.0.33