[Letux-kernel] LetuxOS Kernel v5.0-rc1 - BeaglBone backlight issues

H. Nikolaus Schaller hns at goldelico.com
Tue Mar 19 16:18:05 CET 2019

> Am 18.03.2019 um 21:04 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> * BBB+LCDC:	display ok, backlight is always on (but does not respond to "xset dpms")

This seems to have a threefold reason:
1. there is no DT node for connecting the backlight to the panel driver
2. the CONFIG_PWM_TIEHRPWM driver is not configured
3. after proerly configuring, pwmss_probe() or ehrpwm_pwm_probe() is never called...
   and the pwm_bl finally fails with EPROBE_DEFER and no /sys/class/backlight is

The result is that the PWM driver does not run and therefore no backlight pwm driver.

I now wonder if it ever did work... Probably not...


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