SuperMaximus

Hi! I'm using Tinkerboard S R2.0 in headless mode, but with LightDM (kiosk mode). It's connected to HDMI display, and I soldered display's backlight on/off contact to a relay that can turn on/off the backlight. I see that Amrbian turns off image output (launches screensaver as a black screen) after 10-15 min, but I could not find out where those settings are stored. Please help to find out.

Thanks for your recommendation. I followed it and added pwm1, pwm2, pwm3 to my armbianEnv verbosity=0 bootlogo=true console=serial overlay_prefix=rockchip overlays=i2c1 i2c4 spi2 spidev2 uart1 uart2 pwm1 pwm2 pwm3 rootdev=UUID=7a71009a-a5f6-439f-a2d3-38574c1ea09b rootfstype=ext4 extraargs=vt.global_cursor_default=0 quiet splash plymouth.ignore-serial-consoles systemd.unified_cgroup_hierarchy=0 stdout=serial usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u And now my Tinkerboard can't boot at all. I can't even connect via SSH. Is there any way out of it? Thanks!

@jock I would be grateful for your help! I want to control the Waveshare 7" HDMI LCD screen brightness via this PWM.

Hi! When I try to access PWM via procedure described here https://tinker-board.asus.com/forum/index.php?/topic/15132-direct-gpio-access/ I see that & are not present (although they should be) I can see pwmchip0, but I don't understand what GPIO it is. Following ASUS docs from GitHub https://github.com/TinkerBoard/TinkerBoard/wiki/User-Guide#gpio-config-table-for-tinker-board-s--tinker-board-s-r20 GPIO32 and GPIO33 should be here: PWM:/sys/class/pwm/pwmchip3 and PWM:/sys/class/pwm/pwmchip2 But those directories are not present. root@tinkerboard:~# ls -la /sys/class/pwm/ total 0 drwxr-xr-x 2 root root 0 Oct 7 11:47 . drwxr-xr-x 65 root root 0 Jan 1 1970 .. lrwxrwxrwx 1 root root 0 Oct 7 11:47 pwmchip0 -> ../../devices/platform/ff680000.pwm/pwm/pwmchip0 My Armbian Env is: verbosity=0 bootlogo=true console=serial overlay_prefix=rockchip overlays=i2c1 i2c4 spi2 spidev2 uart1 uart2 rootdev=UUID=7a71009a-a5f6-439f-a2d3-38574c1ea09b rootfstype=ext4 extraargs=vt.global_cursor_default=0 quiet splash plymouth.ignore-serial-consoles systemd.unified_cgroup_hierarchy=0 stdout=serial usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u

Hi! I need to make sure that my GPIOs remember the last state when my Tinkerboard reboots. Is it possible to modify the bootloader and avoid GPIO.cleanup? If yes, then how? Thanks!