I have tried that on 19.04 with kernel 5.0.0-25-generic but it did not work. What are ways to debug this?
/sys/class/leds/asus::kbd_backlight/brightness exists and can hold a value of 0, 1, 2 or 3. Lower than 0 results in bash: echo: write error: Invalid argument Values over 3 result in 3. Tree is # ls -ltra /sys/class/leds/asus::kbd_backlight/ total 0 -rw-r--r-- 1 root root 4096 Aug 27 22:45 uevent drwxr-xr-x 4 root root 0 Aug 27 22:45 .. lrwxrwxrwx 1 root root 0 Aug 27 22:45 subsystem -> ../../../../../class/leds -r--r--r-- 1 root root 4096 Aug 27 22:45 max_brightness -r--r--r-- 1 root root 4096 Aug 27 22:45 brightness_hw_changed -rw-r--r-- 1 root root 4096 Aug 27 22:46 trigger drwxr-xr-x 2 root root 0 Aug 27 22:46 power lrwxrwxrwx 1 root root 0 Aug 27 22:46 device -> ../../../asus-nb-wmi -rw-r--r-- 1 root root 4096 Aug 27 22:51 brightness drwxr-xr-x 3 root root 0 Aug 27 22:53 . -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1796573 Title: Keyboard backlight not working on ubuntu 18.10, but works on 18.04 Status in Linux: Confirmed Status in linux package in Ubuntu: Incomplete Bug description: 1) 18.10 2) 3) keyboard backlight turns on 4) nothing I have ASUS s14 s406ua laptop and I can't turn my keyboard backlight on... ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: linux-image-4.18.0-8-generic 4.18.0-8.9 ProcVersionSignature: Ubuntu 4.18.0-8.9-generic 4.18.7 Uname: Linux 4.18.0-8-generic x86_64 ApportVersion: 2.20.10-0ubuntu11 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: nadavshabtai 2215 F.... pulseaudio CurrentDesktop: ubuntu:GNOME Date: Sun Oct 7 19:21:02 2018 InstallationDate: Installed on 2018-09-28 (9 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 003: ID 13d3:3500 IMC Networks Bus 001 Device 002: ID 13d3:56a2 IMC Networks Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: ASUSTeK COMPUTER INC. X406UAR ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-8-generic root=UUID=35bafd0c-f18c-4cc0-9146-d0f9f77447ff ro quiet splash vt.handoff=1 RelatedPackageVersions: linux-restricted-modules-4.18.0-8-generic N/A linux-backports-modules-4.18.0-8-generic N/A linux-firmware 1.175 SourcePackage: linux UpgradeStatus: Upgraded to cosmic on 2018-09-28 (9 days ago) dmi.bios.date: 04/24/2018 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: X406UAR.309 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: X406UAR dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX406UAR.309:bd04/24/2018:svnASUSTeKCOMPUTERINC.:pnX406UAR:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX406UAR:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.family: VivoBook dmi.product.name: X406UAR dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1796573/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
