How to fix Logitech G915 going back to rainbow after sleep on Linux

g915-on-linux.md

How to fix the reset to rainbow lightning effect after keyboard wakes up from sleep

Install G HUB (Windows or MacOS), connect keyboard with Lightspeed, go to Settings, and set ON-BOARD MEMORY MODE to ON. This is a one-time setup for the lifetime of a keyboard.

Other features that work on Linux

Works out of the box:

• All the media buttons, game mode (disables the Win key), volume control. In other words, all the buttons work.
• Pressing ☀ cycles through brightness levels.
• Pressing ☀ + [NUM] (where [NUM] is 0, 1, 2, ..., 9) allows you to change the lightning effect on the fly.
• Pressing ☀ + - and ☀ + + changes the lightning effect speed for the non-custom effects.

Requires one-time setup with G HUB (connected through Lightspeed), then works everywhere you attach the keyboard to, including Linux:

• You can create custom lightning effects in the G HUB app (or download free lightning effects created by others from the G HUB) and then store two of them on the keyboard itself. The animations are accessible through ☀ + 8, ☀ + 9 (You can also set it to FN + F1, FN + F2, etc.)
• You can change the keyboard sleep timeout

I struggled with the same issue on Windows. Here is how I solved it (https://www.reddit.com/r/LogitechG/comments/s0wa3b/logitech_g915_and_g915_tkl_custom_lighting/)

1. Create your custom lighting profile through G-Hub
2. Upload the lighting profile to the on-board memory
3. Go to Lightsync settings and select the Preset tab
4. From the Effect drop-down menu, you can now see the custom profile which you uploaded to the on-board memory - select it. This can be any custom effect you create, but it must be selected through the Effect tab, otherwise it will not work.
5. Enable on-board mode, and upload the custom profile with the new light settings to the keyboard

You should instantly see your custom lighting and profile selected after the upload, which is indicating that everything is working correctly. You don't have to select it with the Brightness key + 8.

Proper Linux Fix:

1. Install OpenRGB for Linux. Preferably version 0.8 or newer. They provide newer packages for manual install, if your distro is outdated or doesn't ship it.
2. Create a color profile for your keyboard in OpenRGB, and save it with a name such as "Desktop".
3. Go into the OpenRGB settings and enable running at startup, running minimized, and tell it to automatically load the "Desktop" profile you created.

That's it. That is all you have to do. There is zero need to save any permanent profiles inside the keyboard memory.