Battery life is usually less than expected due to unoptimized software and processors clocking too high. On my devices, I set the CPU governor to 'powersave', which reduces power usage but also performance.
There are multiple scaling governor settings which might not be available on all devices (depends on kernel configuration)

• performance : high frequency; slightly increased performance and battery consumption
• powersave : low frequency; reduced performance and superior batter life
• schedutil : changes according to the scheduler (default on my device)

This command list the available governors to set for each core (should be more than those I listed above)
sudo cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_governors
Report which governors are currently selected for each core:
sudo cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
Set the scaling governor to powersave to every core:
echo "powersave" | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

The commands above do not need mounting root as read-write, any change is reverted on reboot.
I tried to make an app for configuring these (a while ago) but I had trouble with sudo.

@ds2k5 You can enable the SSH server from UT tweak tool.

@Salah I believe it should work fine, as these icons neither large (to fill the partition) nor a dependency to something.
I had modified lomiri's qml by editing some files, and there wasn't any issue.
You can try, and if it fails reflash.

@mihael In the same directory normal Debian-based distros with NetworkManager do:
/etc/NetworkManager/system-connections/WIFI_SSID.nmconnection

@wally Just ported the app to 20.04, changing icons works!
This is the new repository: https://gitlab.com/ikozyris/custom-phablet-tools,
I plan to publish it to the open store if it works for others as well.
Took me ~2 hours.
I might add a way to add custom icons, currently they are downloaded from https://framagit.org/ubuntouch-fr-dev/custom-phablet-tools/raw/media/icons/[APP-NAME.EXTENSION].

@Salah I'm currently rewriting the backend to not require remounting as read-write. Currently this arm64 focal .click works. Screenshot:

@Salah said in Customizing Icons:

If you go to icons folder, you well see several icon folder with icons including the main one which if officially used (suru) and they are not used.

These are available if you click on the top-left icon. Select one from the list

Salah said in Customizing Icons:

have installed it, which apparently not available in Open Store

I submitted the app to the OpenStore, but I was suggested to rewrite the scripts so they don't require remounting the rootfs as read-write. I have made some progress, and the icon names had to be renamed. So the old versions don't work, unless it fetches the icons from a snapshot of a previous version. I can easily fix the hacky version temporary to work fully, but better way for the newer, cleaner method, which is WIP.

Salah said in Customizing Icons:

Is there any way I can Add my icons to this app !!

Yes, you have to rename your icons to match the names of those in the repo. Put them in a folder. Then write that path (absolute path and the last /) in the text box below

@Enrico13011978 But I have changed the backend to not require remounting root as read-write or sudo. I now call it Icon Changer, as I removed the wallpapers.

@kugiigi That is what Fdroid does, if I remember correctly. You submit an app via a pull request, a bot checks the source code and if everything is fine a person reviews the app and it is built on theirs servers from the git repo.

@pepijndevos I think with "Gallium" you mean Halium, which is indeed an abstraction layer between the android hardware drivers (blobs), not just LineageOS, and a normal Linux distro.

Although I don't know much about Sailfish OS, their stack seems close to ours, so you should be able to use most of their kernel code. It wouldn't be as simple as flashing a generic system image.

The rootfs is supposed to be generic, but from my experience every device needs different tweaks (so you can't just flash the rootfs), that is why the overlay method exists, which all new ports use.

You can try adapting the kernel sources to Ubuntu Touch, and then the rootfs probably from scratch. I couldn't find any port source code from Sailfish OS, as Ubuntu Touch has, which is of course necessary.

@Ad You can try powering off, boot to recovery and reflash without the erase data checkbox ticked.
To power off you can press the power off and volume up buttons for 15s (I don't have the OP5T, but it should work for any device).

@gwado You could encrypt it with username and salt it. You could use something like PGP for that. The best way would be to save it to a file with read only permissions and owned by root.
Does nextcloud support public-private key login? That would be ideal.

For QML, there is the settings component which saves the variables in a file, but the content isn't readable with a simple cat (IIRC).

There is a lot more information in this Unix stackexchange thread.

@CatWithUT It is part of the terminal app. You can even customize it, don't remember how, but someone modified some XMLs in this forum.

@_Joao_ It needs new lines after each entry (or space)
Example:

[Desktop file]
Application=aaaa
Icon=bbbb

@saveurlinux Does it work if it is launched on an async thread (from STL, or POSIX threads)? It shouldn't hang.
I've had some problems with qprocess unable to run certain commands too.

Unfortunately every app has its own different plugin to run commands e.g. UTT, snapz0r, uadblock and my icon changer app.

@ifelse Just modify the icon.name variable from a separate function

@E2024 you can run ps aux or top to see running processes (if that's what you mean). These are standard Linux commands you can look up for their documentation on a search engine.

@reikred Treble (by Google) hasn't stopped, all new devices with android 9+ have it. The Ubuntu Touch GSI isn't developed anymore.

@reikred There is project Treble (made partitioning more standard with A/B partitions) which somewhat fixes those issues, which enabled for an Ubuntu Touch GSI to be developed. However its development has stopped as it was a dead end to create fully functional devices.

@gwado The documentation (https://doc.qt.io/qt-5/qml-multimedia.html#audio) doesn't say that audio play starts automatically.
Try

Component.onCompleted: {
    this.play()
}

Or setting autoLoad: true
Always inside the audio component