HP Envy tilt 23 none BRIGHTNESS control

I just bought the HP tilt 23 with Win8.1.

The brightness is set too high for night use. The charms setting brightness icon is gray. When I move the mouse on the icon of the BRIGHTNESS was the message "Windows is unable to control the brightness in the conputer"

All the screens where the brightness setting may be available does not have a BRIGHTNESS slider.

All display drivers are up to date.  To restore the driver is greyed out

There are 2 shown graphics card: Intel 4600 and Geforce GT730

Don't know what to do next. Advise please.

Since I didn't know the complete model of the computer, here's a guide to one of the same series.  If this does not help, we will continue to try until we have run out of options.

Tags: HP Desktops

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