[Bug 109217] clock management is disabled for the 4K resolution with polaris 10

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109217

            Bug ID: 109217
           Summary: clock management is disabled for the 4K resolution
                    with polaris 10
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: fin4478 at hotmail.com

Created attachment 142962
  --> https://bugs.freedesktop.org/attachment.cgi?id=142962&action=edit
Simple python app for monitoring and changing the engine clock

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. The
automatic power management works with 2560x1600 and lower resolutions. 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.

Adding amdgpu.ppfeaturemask=0xffffffff to the kernel command line makes the
powerplay feature to work normally at 4K.

System:
  Host: ryzenpc Kernel: 4.20.0-rc4+ 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: 4207 
  date: 12/07/2018 
CPU:
  6-Core: AMD Ryzen 5 1600 type: MT MCP speed: 3132 MHz 
Graphics:
  Device-1: AMD Ellesmere [Radeon RX 470/480] driver: amdgpu v: kernel 
  Display: x11 server: X.Org 1.20.3 driver: amdgpu 
  resolution: 3840x2160~60Hz 
  OpenGL: renderer: Radeon RX 570 Series (POLARIS10 DRM 3.27.0 4.20.0-rc4+ 
  LLVM 7.0.1) 
  v: 4.5 Mesa 19.0.0-devel (git-70be9af 2019-01-02 cosmic-oibaf-ppa)

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