[Bug 98004] RX470 doesn't reclock memory if a second display has been plugged in at some point

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98004

            Bug ID: 98004
           Summary: RX470 doesn't reclock memory if a second display has
                    been plugged in at some point
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: minor
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: jonathanmoerman at gmail.com

If a second display has been plugged in the memory clock gets stuck at the
highest frequency, even if the display is disabled (using xrandr) or unplugged
again.

How to reproduce: plug in a second display and either disable it or unplug it
again, the memory will continue to be clocked at its maximal frequency (Here:
1750Mhz).

Kernels used for testing: Linux 4.4 (amdgpu-pro kernel driver), 4.7, 4.8rc5

The hardware is perfectly capable of clocking back to its lowest frequency if
only one display is actually enabled. (It works as expected in Windows)

This issue doesn't cause any problems other than using more watts than
necessary.

I'm not currently using the system with the RX470 GPU, I'll upload a dmesg log
in a few minutes.

I'm sorry if this isn't the correct place to post this bug, I'm new here.

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