TALKBACK app has disabled my screen. Dimmed screen stays dim. - ONE Q&A, Help & Troubleshooting

My Oneplus One screen is stuck dim, too dark to use for normal vision.
My phone accidentally engaged Talkback app and checked dim screen option.
Here is some info about the dim screen option:
https://support.google.com/accessibility/android/answer/6006589?hl=en
The dim screen stays permanent black even after talkback app was turned off.
I tried several factory resets, I tried changing from CM12 to Oxygen OS, then changing back to CM12.
After reinstalling CM12 most recently the talkback app was active again as soon as the phone booted up.
What I mean is, the phone was going from Oxygen OS installed with Talkback off but dim screen option was stuck dim, changed to CM12 and as soon as the phone booted it was in Talkback mode and the screen was stuck dim.
Oneplus Support offered to replace motherboard for a costly repair fee.
I have not been able to get support from Google regarding the talkback app.
Need suggestions.

marxsbtg said:
My Oneplus One screen is stuck dim, too dark to use for normal vision.
My phone accidentally engaged Talkback app and checked dim screen option.
Here is some info about the dim screen option:
https://support.google.com/accessibility/android/answer/6006589?hl=en
The dim screen stays permanent black even after talkback app was turned off.
I tried several factory resets, I tried changing from CM12 to Oxygen OS, then changing back to CM12.
After reinstalling CM12 most recently the talkback app was active again as soon as the phone booted up.
What I mean is, the phone was going from Oxygen OS installed with Talkback off but dim screen option was stuck dim, changed to CM12 and as soon as the phone booted it was in Talkback mode and the screen was stuck dim.
Oneplus Support offered to replace motherboard for a costly repair fee.
I have not been able to get support from Google regarding the talkback app.
Need suggestions.
Click to expand...
Click to collapse
bumping this back up, I haven't found a solution yet.

press both volume key for 3 seconds

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Galaxy S6 screen flickering

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Question LineageOS 19 + microg for OnePlus 9: Screen goes dark every few days and I have to reboot

Basically this, every 3 or 4 days or so my OnePlus screen will go dark. It isn't *crashing*, though - it's happened when I've had headphones in listening to music and the music still plays, responds to headset controls, etc., so I think it's just the screen. Normal reboot will not work (holding the power button), although this might be because that presents a reboot menu rather than just rebooting the device. I have to do power button + volume up to reboot the device, at which point it reboots and everything is back to normal. I'm happy to gather any addition logs/data needed to debug, but I can't find anything in my crash debugging app (because it's not a crash...). Other interesting pieces of info
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hyve9 said:
Basically this, every 3 or 4 days or so my OnePlus screen will go dark. It isn't *crashing*, though - it's happened when I've had headphones in listening to music and the music still plays, responds to headset controls, etc., so I think it's just the screen. Normal reboot will not work (holding the power button), although this might be because that presents a reboot menu rather than just rebooting the device. I have to do power button + volume up to reboot the device, at which point it reboots and everything is back to normal. I'm happy to gather any addition logs/data needed to debug, but I can't find anything in my crash debugging app (because it's not a crash...). Other interesting pieces of info
- I get the "Intent Verification Service stopped responding" issue every reboot
- I originally installed by wiping OOS + Android 12 and trying to install 19.1 and 19.1 recovery; this failed (same problem as here: https://forum.xda-developers.com/t/denying-ota-because-it-is-a-spl-downgrade.4463975/), so I installed 18 instead, which failed, but then wiping and going back to 19 succeeded (because the update was newer and thus no longer a "downgrade", I presume. IDK what really happened there).
- Trying to do Android Beam hard crashes the whole device; I've disabled NFC for now
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Click to expand...
Click to collapse
Go into display settings at the bottom and turn off pocket mode.
mattie_49 said:
Go into display settings at the bottom and turn off pocket mode.
Click to expand...
Click to collapse
I don't see anything that says "pocket mode", here are my settings:
Brightness
Brightness level
Adaptive Brightness
Lock Display
Lock screen
Screen timeout
Appearance
Dark theme
Font
Font Size
Display size
Icon Shape
Color
Night Light
LiveDisplay
Colors
Other display controls
Rotation Settings
Display white balance
Smooth display
Full screen apps
Screen saver
Tap to wake
Prevent accidental wake-up
Tap to sleep
Wake on plug
All the "tap to <blank>" settings are on.
hyve9 said:
I don't see anything that says "pocket mode", here are my settings:
Brightness
Brightness level
Adaptive Brightness
Lock Display
Lock screen
Screen timeout
Appearance
Dark theme
Font
Font Size
Display size
Icon Shape
Color
Night Light
LiveDisplay
Colors
Other display controls
Rotation Settings
Display white balance
Smooth display
Full screen apps
Screen saver
Tap to wake
Prevent accidental wake-up
Tap to sleep
Wake on plug
All the "tap to <blank>" settings are on.
Click to expand...
Click to collapse
Prevent accidental wake-up
mattie_49 said:
Prevent accidental wake-up
Click to expand...
Click to collapse
This setting has been turned on, I'll keep my phone running for the next few days and see if it crops up again.
hyve9 said:
This setting has been turned on, I'll keep my phone running for the next few days and see if it crops up again.
Click to expand...
Click to collapse
Ok, it's been about a week and a half, I thought this was resolved but lately the issue has cropped up again, always at inconvenient times. Any logging I can enable or other settings I can tweak?
Had the same issue when I upgraded from C.61, which I now have learned breaks some sensors like light and proximity.
I'm currently back to stock until I have some time on the weekend to experiment again with downgrading to C.47 and then installing LineageOS.
Seems to be happening more frequently as of late. Friendly reminder for those of you experiencing this to not press the power button a bunch of times to try and resolve as (at least on my phone) this calls 911 and then you have to awkwardly explain to emergency services that there is no emergency :/
mattie_49 said:
Prevent accidental wake-up
Click to expand...
Click to collapse
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I used on the proximity sensor tester apps to prove that it is still functioning properly, which I could turn it off at this point as it's certainly causing the issue based that it only happens when I put it into my pocket.
I've tried almost every combination of those settings at this point and it's not working. Might try doing a factory reset at this point..
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