OOPS missed seeing the bit where OP says its solved. Ahh well I will leave it here in case it helps others
An internet search suggests running above command.....and then pressing the Function key and the Function number key to dim......or whatever has been setup to dim the screen, and it should show a result. My image comes from an old Dell which does not use function keys but Fn + up or down arrows for brightless levels.
![[Image: 29394rm.jpg]](http://oi68.tinypic.com/29394rm.jpg)
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acpi_listenAn internet search suggests running above command.....and then pressing the Function key and the Function number key to dim......or whatever has been setup to dim the screen, and it should show a result. My image comes from an old Dell which does not use function keys but Fn + up or down arrows for brightless levels.
Good Luck