FOSS and/or ADB screen dimmer below 0%?

Hi all,

There are a number of apps on the Android App Store that enable you to lower the minimum backlight brightness (or claim to), but I'm looking for de-Googled FOSS options.

Any suggestions? Thanks

hexagonwin 7 points 15 days ago

needs root, but you can just write 0 to the sysfs brightness file (/sys/class/backlight/..../brightness or smth like that)

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Fmstrat 1 point 15 days ago

I will have to look into this. Thanks

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umbrella 1 point 14 days ago

i wonder if there's an app to easily do it already?

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hexagonwin 1 point 14 days ago

it's nothing complicated, if you want an easy to launch shortcut you can look into Termux Widgets and write a shellscript

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Estebiu 5 points 15 days ago

55999

Isnt this already an aosp feature?

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LeighWeighTacoma 4 points 15 days ago

Extra dim isn't even that dim 😭

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Colloidal 4 points 15 days ago

'Tis not.

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avidamoeba 1 point 15 days ago

Def is

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Colloidal 1 point 15 days ago

I'm driving the latest GrapheneOS and don't see it. I don't think they actively remove that option, but I might be wrong. Where are you seeing it, and are you sure it's not your OS that implemented it instead of upstream AOSP?

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avidamoeba 2 points 15 days ago

It's this setting: https://github.com/.... You can trace it in the source code. The general name is Reduce Bright Colors. Check Graphene's src for that. Woulda linked Google's AOSP web page but it's giving me 503 because that's how Google do these days.

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Fmstrat 2 points 15 days ago

I'm on graphene and see it. Your device may not support HDR.

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antipiratgruppen 2 points 14 days ago

It exists in Graphene, but it's in the accessibility settings. I have it as a tile in my quick settings. Try searching for "dim" in the Settings app.

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Estebiu 1 point 14 days ago

I'm using AOSP.

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Fmstrat 2 points 15 days ago

Not on a Kindle Fire 😕

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Estebiu 1 point 14 days ago

oh..

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sculptor0725 1 point 15 days ago

I wonder if programs like redshift offer any guidance or inspiration on how this might be done. I know setting to below 0% would likely involve dimming the image rather than the backlight.

Or perhaps drivers allow completely switching off the backlight, and one could use software pwm to manually set it lower, although that entails some risk of flickering

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Ephera 1 point 15 days ago

I used this app before it came built into the OS for me: https://f-droid.org/packages/com.jmstudios.redmoon

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Fmstrat 1 point 15 days ago

Hmm looks like that's a filter option, not an actual backlight control. Probably would work well if I was OLED, but alas I'm not.

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Ephera 1 point 15 days ago

Ah yeah, it's just a translucent overlay slapped on top of everything. It's the fallback option when nothing else works.

Lots of apps that advertise lowering screen brightness below 0% just do that, so I thought that's what you mean.

There is also a way to properly filter the colors, which doesn't discolor things as badly, but I believe you need root for that, or for it to be built into the OS, like the "Extra Dim" option that various ROMs have.

I guess, there might also be ROMs where the manufacturer decided to limit how low you can set the brightness via the UI, even though the hardware would accept lower values. In that case, yeah, try what @hexagonwin@lemmy.today posted with writing to that file via ADB.
Maybe you can also do that via Termux somehow, if you've got root on your device.

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TrollAccount69 1 point 15 days ago

Low dynamic range

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