Hi dez,
It's quite unlikely DLM App to change brightness of your screen automatically. However, could you test version DLM App 1.11 which doesn't offer brightness & contrast control at all?
To test, please uninstall DLM App 13 first and then install DLM 1.11 from this link:
https://www.synaptics.com/products/d...1?filetype=exe
Regards,
Szymon