[Bug 111032] New: Need to set gt_min_freq_mhz to max value to avoid sync issues on Gemini Lake N5000/J5005

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111032

            Bug ID: 111032
           Summary: Need to set gt_min_freq_mhz to max value to avoid sync
                    issues on Gemini Lake N5000/J5005
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: phunkyfish at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Running Libreelec on various gemini lake boxes using either N5000 or J5005.
Almost since the beginning I have set the max value for gt_min_freq_mhz to
avoid sync/stuttering issues. It's almost like the GPU doesn't know it should
step up or boost itself while playing back video.

Without setting the value playback will fall out of the sync/stutter, however
if I bring up an overlay this will stop. This action must cause the GPU to up
it's clock speed.

Here are the settings I use for gt_min_freq_mhz on LibreElec:

In ~/.config/autostart.sh enter the following on an N5000:

(
echo 750 > /sys/devices/pci0000:00/0000:00:02.0/drm/card0/gt_min_freq_mhz
) &
nohup script.sh &

And on a J5005:

(
echo 800 > /sys/devices/pci0000:00/0000:00:02.0/drm/card0/gt_min_freq_mhz
) &
nohup script.sh &

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