Galaxy S5 mini turns on display and shows background image

[dma_k]

Dear community,

After upgrading Samsung Galaxy S5 mini (model SM-G800F) from Android 5.1.1 (LMY47X.G800FXXU1BPC4) to 6.0.1 (MMB29K.G800FXXU1CPL1) I have noticed that on some event the phone switches on the display and shows the background image:

I was not able to detect the event that triggers the screen on: I usually find the phone with display turned on when I am about to disconnect it from the charger. After disconnecting the charging cable, the screen stays on. The display can be turned off using the right-side button, as usual.

I have another Samsung Galaxy S5 mini black with Android 6.0.1 (firmware MMB29K.G800FXXU1CRB1) which does not suffer from this problem.

Any ideas how to fix / workaround this nasty problem? At least it slows down the charging time.

P.S. Originally posted here, but it was advised to post to local forum.

[Rohit]

You can try to install the software again. Try Smart Switch on the PC/Laptop.

http://www.blogtechtips.com/2017/06/24/easily-restore-samsung-device-firmware-with-smart-switch/

https://www.youtube.com/watch?v=9QhJngOuLQ4

[Nick]

This looks like a screensaver. You can find the option via the Display settings. 

[dma_k]

I have investigated the issue a bit more. The issue happens only when:

• The charger is plugged to phone USB.
• The phone receives a call or SMS. Then the display is on, showing the lock screen with time & buttons as usual. After a certain timeout the display kindof switches off, but stays on with the picture as I provided in my original post. All controls disappear.

The problem does not occur when I disconnect the phone from USB charger.

So it is not a screensaver. Also I don't think that rolling back to another (older) firmware (like

Rohit suggested) is a good idea, since the current firmware has security issues fixed.

How to further dig into the problem?

[Nick]

Have you checked the screensaver option though? Since this screen is the exact color that the screensaver is. 

[dma_k]

Thanks for your hint. It seems that it had helped. Indeed one needs to go to Settings → Display → Daydream (screensaver to be displayed while the device is charging) and turn it off (it had a setting "Colours").