[Bug 107929] New: High memory clock speed issue on R9 380

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Sep 14 10:17:47 UTC 2018


            Bug ID: 107929
           Summary: High memory clock speed issue on R9 380
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: sergej.schmidt91 at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 141561
  --> https://bugs.freedesktop.org/attachment.cgi?id=141561&action=edit

My setup is Strix R9 380 and two monitors Samsung SyncMaster XL2370 und Asus
VS278. I use Ubuntu 18.04 on 4.15 Kernel and Windows 10 in Dual Boot. If i use
Ubuntu with two monitors, the memory clock raises to the maximum 1425mhz in

I already know that there is an issue with dual monitor setup on AMD GPUs but i
tested it on Windows and there are no issues with these two monitors. When i
have Chrome open and browse the internet it is mostly 300 or 700mhz. I just
have to set both monitors to exactly 60 hertz.

1. On Linux i checked and set the monitors to 60 hertz.

2. I have tried the 4.18.7 and 4.19rc3 Kernel.

3. Installed the driver from AMD website.

4. I saw some commands for manual select of clock speed. ->Works only for GPU
echo manual > /sys/class/drm/card0/device/power_dpm_force_performance_level
echo 1 > /sys/class/drm/card0/device/pp_dpm_mclk

5. amdgpu.dc=1 amdgpu.dpm=1

None of these works.

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