Modify
/sys/devices/platform/dell-laptop/leds/dell\:\:kbd_backlight/stop_timeout
Default =
10s (seconds); Set to
20m (minutes)
Unsure how to disable timeout completely, but setting to a large value could work too.
Source:http://www.dell.com/support/article/us/en/04/sln308123/how-to-configure-the-keyboard-backlight-time-out-interval-in-ubuntu-linux
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