https://forum.crystalfontz.com/threads/freevo-lcdproc-0-5-backlight-suspend.1972/
Freevo, lcdproc 0.5 backlight suspend | Crystalfontz LCD Forum
May be usefull to anyone currently trying to get the 633 working with Freevo. Code below is a hack to get a Crystalfontz 633 to suspend it's backlight...
freevobacklightsuspendlcdforum