What's the situation with blue light filtering on Ubuntu Touch?

Opolork

Hi.

What method(s) are there to filter blue light in UT?

Thanks.

advocatux

@Opolork not much since this approach https://github.com/ubports/ubuntu-touch/issues/191

Opolork

@advocatux said in What's the situation with blue light filtering on Ubuntu Touch?:

@Opolork not much since this approach https://github.com/ubports/ubuntu-touch/issues/191

So Night Mode is a proper replacement for a blue light filter?

advocatux

@Opolork I don't know but probably @UniSuperBox can give you more details about that, and about the current technical challenges in UT to implement it

Opolork

@advocatux said in What's the situation with blue light filtering on Ubuntu Touch?:

@Opolork I don't know but probably @UniSuperBox can give you more details about that, and about the current technical challenges in UT to implement it

Ok, thanks again. Maybe Dalton Durst will pop in to this thread sometime.

advocatux

@Opolork yep, sure. He's pretty busy with other UT stuff but he usually makes some time to come to the Forum

UniSuperBox

Gonna disappoint you here, I really don't know what's needed to do that. It's possible that color calibration is already built in to Mir (I'm sure it is), so that'd be the first lead to follow. @alan_g?

Giiba

I know 18.04 offers it as a basic system setting so it can't be impossible.

arubislander

No, adding a system setting is not impossible. The challenge is implementing this feature on the relevant software stack of the mobile devices, which is nothing like the software stack on the desktop. Which in turn is the reason that, unfortunately, the existence of an implementation on the desktop is irrelevant to the current issue.

alan_g

@UniSuperBox said in What's the situation with blue light filtering on Ubuntu Touch?:

Gonna disappoint you here, I really don't know what's needed to do that. It's possible that color calibration is already built in to Mir (I'm sure it is), so that'd be the first lead to follow. @alan_g?

Not a full answer, but essentially "blue light filtering" amounts to customising the gamma curves. Mir supports setting the gamma curves as part of the display configuration: this allows more general "display calibration" than "blue light" but is the way to do it.

So far as I can recall this has not been used outside if the tests, and I can't say whether any of it works with your libhybris/android "platform".

It would be an interesting "exercise for the reader" to try implementing "blue light filtering" in one of the Mir examples.

I just saw this: http://jonls.dk/redshift/

I don't know if it would be of any use...

dobey

@3arn0wl said in What's the situation with blue light filtering on Ubuntu Touch?:

I just saw this: http://jonls.dk/redshift/

I don't know if it would be of any use...

It doesn't support Mir/Wayland, and Mir/Wayland don't allow arbitrary apps access to the screen like that, so no, it's not really.

This is something that really needs to get baked into the system.

Opolork

I'd see a blue light filter function as a very high priority given how it's known to affect peoples sleep so badly.

alan_g

@Opolork said in What's the situation with blue light filtering on Ubuntu Touch?:

I'd see a blue light filter function as a very high priority given how it's known to affect peoples sleep so badly.

Everyone is entitled to decide their own priorities. If this is "a very high priority" for you, the joy of open source is that you can do something about it. Here's a plan:

Check out the Mir code and get it building.
Find the mir_demo_server example and add a "blue light filtering" option by setting gamma ramp on the display configuration.
Try it out and confirm if it has the desired results.
Adapt this code to provide this "filtering" option via the MirAL interface.
Propose (and get accepted) this addition to the Mir project.
Check out the QtMir code and get it building.
Make use of the new MirAL option for "blue light filtering".
Propose (and get accepted) this addition to the QtMir project.

There are people willing to help with every step along the way.

Good luck!

Opolork

Hi Alan. But blue light affects everyone's sleep. Sorry, but I don't think I want to go through all of that.

alan_g

@Opolork if it isn't a priority for you, that's fine too.

joe

@alan_g Are there some suggested links to the Mir code etc?

Anyone know where to find these parts in the code?
Thanks

@Opolork @alan_g

There was an email address at the bottom of the Redshift website, so I just pinged the developer and asked if he might consider contributing some expertise to Mir.

alan_g

@joe said in What's the situation with blue light filtering on Ubuntu Touch?:

@alan_g Are there some suggested links to the Mir code etc?

For starters, there's a handy guide to step 1 here: https://mir-server.io/doc/getting_involved_in_mir.html

alan_g

@3arn0wl said in What's the situation with blue light filtering on Ubuntu Touch?:

@Opolork @alan_g

There was an email address at the bottom of the Redshift website, so I just pinged the developer and asked if he might consider contributing some expertise to Mir.

As dobey said above, there's very little overlap. About the only thing in common is the choice of values for the gamma curves.