Randomly stuck at "Reboot: Power Down" - Lemmy.world

## Symptoms * Complete Freeze after: preparing to enter ACPI S5 state Reboot: Power Down * seemlingly random (can successfully shutdown maybe 10 times in a row, then suddenly freezes again) * seems to happen more often as uptime grows * Case Fans still spin, LEDs and Lights stay on * Monitors stay on, still react to HDMI/DP Hotplugging (unplug/plug) * REISUB/REISUO doesn’t work * Disks are already powered off and disconnected * USB devices (eg. keyboard unresponsive) ## Since When * After switching to Arch and flashing BIOS Firmware 7C88v18 to MSI B460M-A Pro Board * Arch Linux is ruled out by me since it’s very unlikely Userland plays a role, and already used Linux before without the problem * Gone from linux ~6.2.10 to 6.4.8, Kernel bug unlikely ## Attempted: * Reflash 7C88v18 from a FAT32 formatted partition (USB) * Add reboot=pci or reboot=acpi acpi=force to kernel cmdline * run fwupd * Stop X and wait a bit for processes to clear up (???) * intel-ucode is installed: ~> pacman -Qi intel-ucode | head -2 Name : intel-ucode Version : 20230613-1 * Other threads on the Internet seem to have easier reproducibility (always happening), solutions were about either kernel cmdline or outdated kernel (If I didn’t see a thread with my exact problem, apologies) ## Hardware Info ~> pacman -Qi nvidia | head -2 Name : nvidia Version : 535.86.05-8 ~> cat /sys/class/dmi/id/board_* 2>/dev/null Default string B460M-A PRO (MS-7C88) Micro-Star International Co., Ltd. 1.0 ~> LC_ALL=C lscpu | grep -i 'model name' Model name: Intel(R) Core(TM) i7-10700 CPU @ 2.90GHz ~> sudo journalctl -k --grep=microcode [...] kernel: microcode: updated early: 0xf0 -> 0xf6, date = 2022-12-26 [...] kernel: SRBDS: Mitigation: Microcode [...] kernel: microcode: Microcode Update Driver: v2.2. ## Misc * Did I just miss something obvious? * I don’t want to go back to an outdated BIOS firmware * lscpu, nvidia-smi and other info added if needed * I have another device (ASUS Board, similar CPU) with similar arch linux setup (nouveau instead of propietary nvidia there), no problems on that device