Arch Linux

mf_nicecub

Member

Registered: 2022-01-26

Posts: 4

Thinkpad Backlight won't turn on for minutes after boot/sleep

Hey there,

I'm on a Thinkpad T460.

This month I've run into a strange problem where my screen doesn't seem to wake from sleep/at boot. There is no sign of the screen's backlight being on*. External monitors work fine. On occasion, the screen will come back on sometimes several seconds after waking, most commonly several minutes, or sometimes seemingly never.

I tried using a lcd-brightness config** with laptop-mode-tools, but this didn't seem to help.

Any ideas/next steps for troubleshooting?

*Curiously, one time I had this issue on boot I recall seeing the Lenovo splash screen *very* faintly, if that's indicative of anything. Most other times though, the backlight seems 100% off.

**

...
#
# Should laptop mode tools control LCD brightness?
#
CONTROL_BRIGHTNESS=1


#
# Commands to execute to set the brightness on your LCD
#
BATT_BRIGHTNESS_COMMAND="echo 600"
LM_AC_BRIGHTNESS_COMMAND="echo 600"
NOLM_AC_BRIGHTNESS_COMMAND="echo 852"
BRIGHTNESS_OUTPUT="/sys/class/backlight/intel_backlight/brightness"