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I recently installed a new motherboard, a Gigabyte B450 Aorus Elite, and since then I've been unable to put my computer to sleep without it immediately starting up again. I had this problem with my last motherboard as well, an Asus Prime B450-Plus, but I was able to solve it last time by disabling certain devices in /proc/acpi/wakeup. This time, however, even if every single device is disabled, it still immediately wakes up.

I tried this solution, but the only device that was enabled was the keyboard, which I wanted to use to wake up the computer from sleep. Nevertheless, I disabled it, but it still immediately wakes up.

pm-is-supported --suspend returns 0, the BIOS doesn't appear to have any settings that would alter this (I disabled Wake-On-LAN just in case but that didn't help), I unplugged all my devices except for a keyboard, mouse, and display but that didn't do any good either. I'm at my wit's end here.

Using Kubuntu 20.04.4 LTS. Thanks.

Tamara Macadam
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Had the same problem, it has nothing to do with /proc/acpi/wakeup, I disabled all without result

The problem was my new Lenovo monitor, I disabled the auto-switching of the source of the monitor, Now the monitor is running with HDMI only and my (K)Ubuntu 21.10 keeps in power-save Maybe somebody can explain it to me :)

ratzee
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  • Sadly, my BenQ GW2270H monitor doesn't have this function, as far as I can tell. In any case, I only have the one input plugged into it anyway, so. – Tamara Macadam Apr 18 '22 at 05:55