Description:
# echo high> /sys/class/drm/card0/device/power_dpm_force_performance_level
bash: echo: write error: Invalid argument

Power management does not work properly for high-refresh displays such as VR headsets.
Without manually setting power_dpm_force_performance_level to high performance is abysmal.
On linux-5.11.1 I can no longer do so.
It works on 5.10 and according to the doc it should still work: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/amd/pm/amdgpu_pm.c?id=8866a67ab86cc0812e65c04f1ef02bcc41e24d68


Additional info:
* package version(s): linux-5.11.1.arch1-1
* config and/or log files etc.: dmesg attached
GPU: 6900 XT
# lspci
00:00.0 Host bridge: Intel Corporation 8th Gen Core Processor Host Bridge/DRAM Registers (rev 07)
00:01.0 PCI bridge: Intel Corporation 6th-9th Gen Core Processor PCIe Controller (x16) (rev 07)
00:02.0 Display controller: Intel Corporation UHD Graphics 630 (Desktop)
00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model
00:14.0 USB controller: Intel Corporation 200 Series/Z370 Chipset Family USB 3.0 xHCI Controller
00:14.2 Signal processing controller: Intel Corporation 200 Series PCH Thermal Subsystem
00:16.0 Communication controller: Intel Corporation 200 Series PCH CSME HECI #1
00:17.0 SATA controller: Intel Corporation 200 Series PCH SATA controller [AHCI mode]
00:1b.0 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #17 (rev f0)
00:1b.4 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #21 (rev f0)
00:1c.0 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #1 (rev f0)
00:1c.4 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #5 (rev f0)
00:1c.6 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #7 (rev f0)
00:1d.0 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #9 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Z370 Chipset LPC/eSPI Controller
00:1f.2 Memory controller: Intel Corporation 200 Series/Z370 Chipset Family Power Management Controller
00:1f.3 Audio device: Intel Corporation 200 Series PCH HD Audio
00:1f.4 SMBus: Intel Corporation 200 Series/Z370 Chipset Family SMBus Controller
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (2) I219-V
01:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL Upstream Port of PCI Express Switch (rev c0)
02:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL Downstream Port of PCI Express Switch
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi 21 [Radeon RX 6800/6800 XT / 6900 XT] (rev c0)
03:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device ab28
03:00.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 73a6
03:00.3 Serial bus controller [0c80]: Advanced Micro Devices, Inc. [AMD/ATI] Device 73a4
05:00.0 Non-Volatile memory controller: Silicon Motion, Inc. SM2262/SM2262EN SSD Controller (rev 03)
07:00.0 USB controller: ASMedia Technology Inc. ASM2142 USB 3.1 Host Controller
08:00.0 Audio device: Creative Labs EMU20k2 [Sound Blaster X-Fi Titanium Series] (rev 04)
09:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961/SM963

* link to upstream bug report, if any: no

Steps to reproduce:

# echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level
bash: echo: write error: Invalid argument
# cat /sys/class/drm/card0/device/power_dpm_force_performance_level
auto