07-15-2017 02:13 PM - edited 07-15-2017 02:13 PM
I've installed a fresh Win7 on a T550 and the screen brightness adjust doesn't work. It doesn't work with the function keys (the volume Fn keys do work) and there is no adjust brightness option in the start menu or display device in control panel either.
I've read various forum entries suggesting reinstall drives etc and I've tried a bunch of things but nothing seems to help.
In device manager the Monitor is listed as "Generic PnP Monitor" and the the Display adapter has "Intel(R) HD Graphics 5500" and "Realtek Wifi Display VGA Adapter"
Can anyone help with how to fix this?
07-16-2017 11:18 PM
Still struggling with this if anyone has any hints...?
Which is the driver that would do the brightness control - the Display adapter of the Monitor?
In Windows Device Manager the Monitor is "Generic PnP Monitor", does that sound right or should it be something else?
The Display adapter driver is: Intel HD Graphics 5500 9/29/2016 184.108.40.20631
If anyone has a T550 with Windows 7 and brightness works could you see what it has for those two?
07-18-2017 05:53 AM
I have T550, Win7, and that same Intel HD Graphics driver. Brightness adjustment works for me.
Usually missing brightness adjustment is caused by video driver problem. In your previous post, you mentioned "Realtek Wifi Display VGA Adapter" which I have never heard of. Where did it come from? I am suspicious that this could be causing your problem.
07-18-2017 08:58 AM
Thank you so much for replying.
I'm not sure where the "Realtek Wifi Display VGA Adapter" came from. It may have been from the initial Win7 install or trying to fix this I've tried installing all the drivers I could find on the Lenovo T550 download page so it could have been one of those. I've now disabled and uninstalled it, but still no brightness control.
This is what divice manager now shows:
07-18-2017 09:16 AM
It's the same as my version here. Only other thing that affects brightness keys is Power Management driver. Device Manager -> System Devices -> Lenovo PM Device, should be 220.127.116.11 or later