System wakes from suspend immediately. Have tried everything I could find

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Hi, I’m fairly new to Linux. I installed Fedora 42 yesterday, which has been a great experience other than that I can’t make my PC stay suspended. I’ve tried all the usual suspects (listed in no particular order).

  1. Disabled PCI device wakeup. (# echo GPP0 > /proc/acpi/wakeup)
  2. Uninstalled NVIDIA drivers.
  3. Unplugged all USB devices.
  4. Added acpi_osi="!Windows 2015" to kernel parameters as suggested by ArchWiki
  5. Added acpi_osi=\"!Windows 2015\" acpi_os_name=\"Microsoft Windows\" to kernel parameters as suggested by another thread on this forum.
  6. Changed sleep state between s2idle and deep.
  7. Disabled Bluetooth and Wi-Fi.
  8. Disabled wake-on-lan

I’ve run dmidecode to find my last wakeup source and it says Wake-up Type: PCI PME#.

I’ve also tried booting Fedora 41 and Linux Mint 22.1 on Live USB and found the same problem to happen.

Here’s my Fastfetch too so you can see my hardware.

         .';:cccccccccccc:;,.             -----------
      .;cccccccccccccccccccccc;.          OS: Fedora Linux 42 (KDE Plasma Desktop Edition) x86_64
    .:cccccccccccccccccccccccccc:.        Host: X570 AORUS ELITE WIFI (-CF)
  .;ccccccccccccc;.:dddl:.;ccccccc;.      Kernel: Linux 6.14.2-300.fc42.x86_64
 .:ccccccccccccc;OWMKOOXMWd;ccccccc:.     Uptime: 37 mins
.:ccccccccccccc;KMMc;cc;xMMc;ccccccc:.    Packages: 2767 (rpm), 9 (flatpak)
,cccccccccccccc;MMM.;cc;;WW:;cccccccc,    Shell: bash 5.2.37
:cccccccccccccc;MMM.;cccccccccccccccc:    Display (LG ULTRAGEAR): 2560x1440 @ 165 Hz in 31" [External] *
:ccccccc;oxOOOo;MMM000k.;cccccccccccc:    Display (HP M27f FHD): 1920x1080 @ 75 Hz in 27" [External]
cccccc;0MMKxdd:;MMMkddc.;cccccccccccc;    DE: KDE Plasma 6.3.4
ccccc;XMO';cccc;MMM.;cccccccccccccccc'    WM: KWin (Wayland)
ccccc;MMo;ccccc;MMW.;ccccccccccccccc;     WM Theme: Breeze
ccccc;0MNc.ccc.xMMd;ccccccccccccccc;      Theme: Breeze (Dark) [Qt], Breeze [GTK3/4]
cccccc;dNMWXXXWM0:;cccccccccccccc:,       Icons: breeze-dark [Qt], breeze-dark [GTK3/4]
cccccccc;.:odl:.;cccccccccccccc:,.        Font: Noto Sans (10pt) [Qt], Noto Sans (10pt) [GTK3/4]
ccccccccccccccccccccccccccccc:'.          Cursor: breeze (24px)
:ccccccccccccccccccccccc:;,..             Terminal: konsole 25.4.0
 ':cccccccccccccccc::;,.                  CPU: AMD Ryzen 5 5600X (12) @ 4.65 GHz
                                          GPU: NVIDIA GeForce RTX 3060 Ti Lite Hash Rate [Discrete]
                                          Memory: 5.58 GiB / 31.26 GiB (18%)
                                          Swap: 0 B / 8.00 GiB (0%)
                                          Disk (/): 280.21 GiB / 1.82 TiB (15%) - btrfs
                                          Disk (/mnt/E20C0F7C0C0F4ACD): 741.00 GiB / 1.82 TiB (40%) - fuseblk
                                          Local IP (wlp4s0): 192.168.1.166/24
                                          Locale: en_US.UTF-8

In my research I’ve discovered that Gigabyte motherboards just don’t play nice with Linux, and that this issue and others similar to it are common. My guess at this point is it’s an issue with my motherboard that has no workaround. But I would very much like to be wrong about that, I’d prefer not to buy a different one if I can avoid it.

Any help is appreciated and I can absolutely provide any additional information that might help. Thank you.