[Bug 201991] New: amdgpu: clock management is disabled for the 4K resolution with polaris 10

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https://bugzilla.kernel.org/show_bug.cgi?id=201991

            Bug ID: 201991
           Summary: amdgpu: clock management is disabled for the 4K
                    resolution with polaris 10
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.18.0,4.20.0-rc6, drm-next-4.21-wip
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@xxxxxxxxxxxxxxxxxxxx
          Reporter: fin4478@xxxxxxxxxxx
        Regression: No

Created attachment 280019
  --> https://bugzilla.kernel.org/attachment.cgi?id=280019&action=edit
simple app for the amdgpu sys interface

When the Xfce desktop is visible at 4K and idling, the engine clock is fixed at
level 6: 1220MHz and you can not change that. The temperature is 38 C. When the
monitor is sleeping, then the engine clock is 300Mhz. The automatic power
management works with 2560x1600 and lower resolutions as espected. I tested
with my python app and I have latest drivers, including firmware files. My
monitor is ASUS VP28UQG and I use the display port.

System:
  Host: ryzenpc Kernel: 4.20.0-rc6 x86_64 bits: 64 Desktop: Xfce 4.12.4 
  Distro: Debian GNU/Linux buster/sid 
Machine:
  Type: Desktop Mobo: ASUSTeK model: PRIME B350M-K v: Rev X.0x 
  serial: <root required> UEFI [Legacy]: American Megatrends v: 4023 
  date: 08/20/2018 
CPU:
  6-Core: AMD Ryzen 5 1600 type: MT MCP speed: 2851 MHz 
Graphics:
  Device-1: AMD Ellesmere [Radeon RX 470/480] driver: amdgpu v: kernel 
  Display: x11 server: X.Org 1.20.3 driver: amdgpu,ati 
  unloaded: fbdev,modesetting,vesa resolution: 3840x2160~60Hz 
  OpenGL: 
  renderer: Radeon RX 570 Series (POLARIS10 DRM 3.27.0 4.20.0-rc6 LLVM 7.0.1) 
  v: 4.5 Mesa 19.0.0-devel (git-9ebc00f 2018-12-13 bionic-oibaf-ppa)

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