Good day/night to everyone. I am sorry about the duplicate post, I had missed that I was also supposed to CC the regressions list.
I have had S3 sleep broken for well over half a year at this point where the kernel simply crashes upon entering sleep, and the PC turns off (literally stops pulling power from the power supply), and turning it on, at first, causes to to run through 1 on/off cycle, with I believe is a diagnostic step on this board, as it happens whenever something causes the PC to unexpectedly turn off (unless the source is external, like a blackout, in which case once power is restored and I turn on the PC, it turns on normally).
At first I thought that it might be an AMDGPU issue, however removing my dGPU, and also, the rest of my hardware, changed nothing.
However I have had at one point had asus-wmi try to put the system into S0ix, despite the firmware lacking support for S0ix, and now FastFetch no longer prints out my motherboards model number on the Host line, instead just showing ASUS MB, so I have reason to suspect that asus-wmi may be the culprit for this regression.
Unfortunately, I am unable to procure logs, since the kernel crashes before anything meaningful is logged.
I know that this is not a hardware issue, since on Windows and older live-images (Solus is my distribution of choice) these issues do not exist.
I am unsure as to which kernel update broke S3 for me, however I believe it was either late in the 6.10.x cycle or the 6.11.x cycle, since the Solus 4.6 live-image has no such issues on 6.10.13, which was also our last 6.10.x kernel update, and I only started experienced it when we updated to 6.11.5, our first update to 6.11.x, and updating to 6.12.x did not fix anything. The current Solus 4.7 live-image has 6.12.9, and my installed system is currently on 6.12.21.
Hardware:
Motherboard: Asus Z97 Pro Gamer
CPU: i5-4570
dGPU: Sapphire Radeon 540 4GB
RAM: 2x Crucial 8GB DDR3L@1600MT/s, 1x Crucial 4GB DDR3L@1600MT/s
Storage: 500GB Western Digital WD5000AAKX SATA3 7200RPM HDD
DVD Drive: Lite-On DH16ABSH
Add-in cards: Intel 3168 PCIe+USB (by means of a simple adapter) VIA VT6315 Firewire 400 PCIe, MosChip MCS9865 Parallel PCI (over integrated ASMedia ASM1083/1085 PCIe to PCI bridge)
PSU: Seasonix SS-860XP² 860W