I believe I read somewhere in a thread here that there is no brightness/contrast adjustement. and that the superknob footpedal has to be the yamaha fc7.

Gabi, Thanks for reply. ...

Yamaha Confirms: ..."Connect the Foot Controller (FC7) to the FOOT CONTROLLER 2 jack on the rear panel,
FOOT CONTROLLER 2 jack is set to control the Super Knob by default".

Gabi wrote:

I believe I read somewhere in a thread here that there is no brightness/contrast adjustement. and that the superknob footpedal has to be the yamaha fc7.

I also would not know of a brightness control. For the super knob foot control I use a Korg-EXP2. Works just fine.

Certainly the foot controller jack used can be either one since the destination is programmable.

http://faq.yamaha.com/us/en/article/musical-instruments/keyboards/synthesizers/montage/11002/9113/?current_page_id=1&sort=&type=

As of yet, the suggestion to adjust display contrast or brightness has not been "picked up" as far as I know:

https://yamahasynth.com/forum/can-the-screen-get-brighter

The workaround I offered - which is only for display - is to "throw hardware" at it and use an external display. This may not be suitable for all applications, but you do have the choice of using a display which itself has contrast and brightness control. One problem with this is that your non-constrast-controlled screen is the one with touch features and the contrast-controlled-external monitor will not accept touch gestures.

At some point Yamaha mentioned they would provide information on supported display adapters that were compatible - but I have not yet found this information has been published. There are various threads where users share what works such as:

https://yamahasynth.com/forum/remote-display-of-montage-screen

In the past, I've also mentioned that there is a lot of synergy and chance for innovation around pairing a tablet with the Montage (tethered). Having a touch display on a tablet along with some sequencing and sampling features on the tablet. Seems like a nice portable PC with added benefit of also providing a touchscreen interface. Offer an SDK ("ADK" for Android) for 3rd party enablement of the application design so perhaps Yamaha doesn't have to do this on their own. That doesn't help you in the here-and-now, but as users voice some critique for the display it opens the door to also feed back possible reasonable (longer term) solutions.