Problem on Samsung Dex: S21 Ultra screen keeps waking up when using external keyboard to type.

[Kensamsung]

When using Samsung Dex, my S21 Ultra phone will constantly wakes up by itself whenever I use my external keyboard to type on web browser app or etc app. I'm using an USB dongle for my external keyboard and mouse. Does anyone face the same issue when you use a external keyboard? Does anyone knows how to solve the screen waking issue? Thank you

Information of the phone:
Model: S21 Ultra SM-G998B/DS
One UI version: 3.1
Android : 11
Android security patch level: 1 May 2021

Just an update: I tried using the same setup on S20Ultra, it did not face such an issue.

[SamsungNantakkumar]

Hello Members_lU8tDrD. I am Faiz from Samsung.

We would like to propose a Smart Tutor. This is a service where we will be able to assist you with further troubleshooting over the call. Please call our Samsung Care Line 1800-726-7864 regarding this service. Our experts at Samsung Care Line will advise and assist you in details.

Thank you.

[jamesbob]

I am also facing the same thing for my screen wake and light up. When the phone is locked with no activities

[Kensamsung]

It only happens to S21ULTRA phones. Hopefully they will comes out with a software hotfix/patch for this screen wake issue soon.

[jamesbob]

Wow.. how did you know? Do you use this phone model? Or is it a widely known issue/bug?

[Kensamsung]

Yeah, I'm using S21Ultra that is why I know there is such a issue with it. I tried on another S21Ultra, the issue was the same. Other model like S20 or Note20 series didn't face this issue. Let's hope Samsung will fix this issue soon...