Unable to Achieve C6+ Idle State - Server Stuck at C3

[mountain.wave5410]

I'm experiencing an issue with achieving C6 idle state on my server. Despite enabling all relevant options in BIOS and setting C-state to 10, the system remains stuck at C3 idle state. I'm using latest BIOS and ProxmoxVE 9

When I unplug the LAN cable: C6 idle state is achieved
When I disable the entire LAN device in BIOS: system reverts back to C3 (idk why, that's stupid)
Disabling Wake-on-LAN: still C3

CPU: Intel Core i5-14500
Motherboard: ASUS ROG STRIX B760-I GAMING WIFI
RAM: Patriot Viper Venom DDR5 32GB x2
PSU: Corsair RM750X
Storage:
- Intel 480GB SSD SATA D3-S4610 (SSDSC2KG480G8)
- WD Black SN770 2TB M.2 2280
- WD Red Plus 8TB (WD80EFPX)

VMs:
- OpenMediaVault with passthrough HDD
- Media like Jellyfin/Audiobookshelf

# cat /sys/devices/system/cpu/cpu0/cpuidle/state*/name
POLL
C1_ACPI
C2_ACPI
C3_ACPI

# lspci -vv | grep -i aspm
                LnkCap: Port #5, Speed 16GT/s, Width x4, ASPM L0s L1, Exit Latency L0s <4us, L1 <16us
                        ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+
                LnkCtl: ASPM L1 Enabled; RCB 64 bytes, LnkDisable- CommClk+
                LnkCap: Port #25, Speed 16GT/s, Width x4, ASPM L0s L1, Exit Latency L0s <1us, L1 <4us
                        ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+
                LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes, LnkDisable- CommClk-
                LnkCap: Port #1, Speed 8GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <1us, L1 <4us
                        ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+
                LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes, LnkDisable- CommClk-
                LnkCap: Port #3, Speed 8GT/s, Width x1, ASPM L1, Exit Latency L1 <64us
                        ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+
                LnkCtl: ASPM L1 Enabled; RCB 64 bytes, LnkDisable- CommClk+
                L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+
                L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+
                LnkCap: Port #15, Speed 16GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <1us, L1 <4us
                        ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+
                LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes, LnkDisable- CommClk-
                LnkCap: Port #0, Speed 16GT/s, Width x4, ASPM L1, Exit Latency L1 <8us
                        ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM L1 Enabled; RCB 64 bytes, LnkDisable- CommClk+
                L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1- L1_PM_Substates+
                L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1-
                LnkCap: Port #0, Speed 5GT/s, Width x1, ASPM L1, Exit Latency L1 <4us
                        ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM L1 Enabled; RCB 64 bytes, LnkDisable- CommClk+
                L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+
                L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+

# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-6.14.8-2-pve root=/dev/mapper/pve-root ro quiet intel_iommu=on iommu=pt initcall_blacklist=sysfb_init video=simplefb:off video=vesafb:off video=efifb:off video=vesa:off disable_vga=1 vfio_iommu_type1.allow_unsafe_interrupts=1 kvm.ignore_msrs=1 modprobe.blacklist=radeon,nouveau,nvidia,nvidiafb,nvidia-gpu,snd_hda_intel,snd_hda_codec_hdmi,i915

# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-6.14.8-2-pve root=/dev/mapper/pve-root ro quiet intel_iommu=on iommu=pt initcall_blacklist=sysfb_init video=simplefb:off video=vesafb:off video=efifb:off video=vesa:off disable_vga=1 vfio_iommu_type1.allow_unsafe_interrupts=1 kvm.ignore_msrs=1 modprobe.blacklist=radeon,nouveau,nvidia,nvidiafb,nvidia-gpu,snd_hda_intel,snd_hda_codec_hdmi,i915

GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on iommu=pt initcall_blacklist=sysfb_init video=simplefb:off video=vesafb:off video=efifb:off video=vesa:off disable_vga=1 vfio_iommu_type1.allow_unsafe_interrupts=1 kvm.ignore_msrs=1 modprobe.blacklist=radeon,nouveau,nvidia,nvidiafb,nvidia-gpu,snd_hda_intel,snd_hda_codec_hdmi,i915"