MCLK stuck at 1000MHz on 6800 XT on some refresh rates

Brief summary of the problem:

Hi! I'm somewhat new to discrete GPUs, so maybe I'm missing something, but it looks like my card's memory clock is stuck at 1 Ghz.

I did try some random kernel module parameters (amdgpu.ppfeaturemask=0xfffd7fff amdgpu.runpm=1), but they seem to have no effect. Setting /sys/class/drm/card0/device/power_dpm_force_performance_level to low also has no effect on the memory clocks.

Hardware description:

• CPU: Ryzen 5950X
• GPU: Radeon 6800 XT
• Display: Philips 326M6VJRMB_00
• Type of Diplay Connection: DP

System infomration:

• Distro name and Version: Arch Linux
• Kernel version: 5.10.0-rc6-1-mainline

How to reproduce the issue:

$ cat /sys/class/drm/card0/device/pp_dpm_mclk

0: 96Mhz 
1: 456Mhz 
2: 673Mhz 
3: 1000Mhz *

# cat /sys/kernel/debug/dri/0/amdgpu_pm_info
GFX Clocks and Power:
	1000 MHz (MCLK)
	500 MHz (SCLK)
	0 MHz (PSTATE_SCLK)
	0 MHz (PSTATE_MCLK)
	875 mV (VDDGFX)
	59.0 W (average GPU)

GPU Temperature: 55 C
GPU Load: 0 %
MEM Load: 1 %

SMC Feature Mask: 0x00003763a36b4dff
VCN: Disabled

Clock Gating Flags Mask: 0x38018300
	Graphics Medium Grain Clock Gating: Off
	Graphics Medium Grain memory Light Sleep: Off
	Graphics Coarse Grain Clock Gating: Off
	Graphics Coarse Grain memory Light Sleep: Off
	Graphics Coarse Grain Tree Shader Clock Gating: Off
	Graphics Coarse Grain Tree Shader Light Sleep: Off
	Graphics Command Processor Light Sleep: Off
	Graphics Run List Controller Light Sleep: Off
	Graphics 3D Coarse Grain Clock Gating: Off
	Graphics 3D Coarse Grain memory Light Sleep: Off
	Memory Controller Light Sleep: On
	Memory Controller Medium Grain Clock Gating: On
	System Direct Memory Access Light Sleep: Off
	System Direct Memory Access Medium Grain Clock Gating: Off
	Bus Interface Medium Grain Clock Gating: Off
	Bus Interface Light Sleep: Off
	Unified Video Decoder Medium Grain Clock Gating: Off
	Video Compression Engine Medium Grain Clock Gating: Off
	Host Data Path Light Sleep: On
	Host Data Path Medium Grain Clock Gating: On
	Digital Right Management Medium Grain Clock Gating: Off
	Digital Right Management Light Sleep: Off
	Rom Medium Grain Clock Gating: Off
	Data Fabric Medium Grain Clock Gating: Off
	Address Translation Hub Medium Grain Clock Gating: On
	Address Translation Hub Light Sleep: On

Attached files:

• dmesg.log