Chromebook refuses to consistently suspend across different distros

[Legume9117]

Quick update with some more data points.

I swapped the SSD and installed Windows 10 to see if this was Linux-specific. On Windows 10, when I manually put the device to sleep, the screen goes black but the backlight never turns off, and it doesn’t appear to enter a real low-power state.

I also tried toggling the EC-related settings in the BIOS (EC Software Sync and Use EC-RW Firmware) and it made no difference.

I found at least one other report that looks very similar:

Hibernation/Suspend not fully functional in Fedora 42, pujjo

Hiya all. I’m running Fedora 42, on my Pujjo, alder lake-n, and it only has s2idle, it doesn’t fully work. Would love some help getting this beast to sleep because shutdown and startup are very tedious. It actually does sleep, except it churns a lot of of battery while it does, making me highly suspicious that it’s actually sleeping.

So it seems like at least these Alderlake/Alderlake-N boards are affected:

• REDRIX (HP Elite Dragonfly Chromebook)
• MARASOV (ASUS Chromebook Plus CX34)
• PUJJO (Lenovo 500e Yoga Chromebook Gen 4 / Lenovo Flex 3i Chromebook 12" / IdeaPad Flex 3i Chromebook 12")

Given that suspend is failing in both Linux and Windows across multiple distros/installs, this is starting to look like a firmware/EC issue on these boards.