Screen remains completely black after setting up a custom mode (Like Do Not Disturb)

Using /e/OS Settings
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1

I have Samsung S10 “beyond1lte” running the newest community version with a15.

I set up a custom “Do not Disturb” mode including some settings with the display. I think it was grey scale and ultra low brightness but I’m not 100% sure.

In the moment I enabled that mode, my screen went completely black.

The hardware works perfectly fine. When I reboot the screen works until I have to put in my PIN. At that point the screen goes black after a few milliseconds. The Touchscreen works too, as I was able to switch of the phone using the “regular” way after multiple attempts.

I tried entering my PIN by hoping to hit the right spots on the screen but it did not work.

I tried connecting the phone to an external screen via USB-C but I assume I have to permit the connection. I tried using a OTG-keyboard but I do not know which keys I have to press to Enter my PIN.

ADB is disabled. I can only enable it in recovery.

I tried changing the Brightness and the power state of the Backlight via ADB but it is overwritten once I reboot. I reinstalled the operation system via sideload, also unsucessfully.

Does anyone have an idea what else I could try besides doing a factory reset?

2

Did you wipe the phone when you reinstalled the OS? That should have cleared all setting back to factory default?

3

On a Samsung there is Soft reset, no loss of data except unsaved work.

Press together
Volume down + Power

while this may invoke screenshot, persevere maybe 15 - 20 seconds required or try again.

4

That is what I hope to avoid as I want to keep the data if possible.
I have backups but I want to avoid setting up everything again properly.

5

Thanks! I did that multiple times but it does not help :frowning:

6

can the twrp for the s10 mount and decrypt the userdata partition? if yes, you could try to overwrite global / system / secure xml settings in /data/system/users/0/ with the corresponding .fallback file.

Though I’m not fully sure where DND profiles are stored, by a cursory search in them with “dnd / disturb / brightness” it had hits, but didn’t yield setting keys I’d be sure to recover your situation - systemui package is another place to check.

Ofc there’s also the risk that overwritting will bring new problems.

1 Like
7

Thanks for the idea. Sadly, twrp does not support the decryption of the userdata partition and I also could not find unofficial build that might be able to help.