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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - vega56 undervolting/overclocking voltage issues"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109887">109887</a>
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<th>Summary</th>
<td>vega56 undervolting/overclocking voltage issues
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/AMDgpu
</td>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>kgkggl+bugs.freedesktop.org@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=143547" name="attach_143547" title="dmesg output">attachment 143547</a> <a href="attachment.cgi?id=143547&action=edit" title="dmesg output">[details]</a></span>
dmesg output
I overwrite "pp_od_clk_voltage" to control the voltage, but I have a problem.
The GPU voltage represents the value of
"/sys/class/drm/card0/device/hwmon/hwmon0/in0_input"
If I set "pp_od_clk_voltage" before starting Xorg/compton/WM, the GPU voltage
will be locked at 1200mv.
If I set "pp_od_clk_voltage" after starting Xorg/compton/WM, the GPU is locked
to 1200mv after a heavy load.
Unless I set "echo c > /sys/class/drm/card0/device/pp_od_clk_voltage" again,
the idle voltage will return to 900-950mv.But still higher than the set value.
Then we have a new problem.I can't control the "P7" voltage by setting
"pp_od_clk_voltage". The value in "pp_od_clk_voltage" can be changed, but the
reading is always 1200mv when the GPU jumps to "P7".
I set "P6" and "P7" to the same value to prevent the GPU from jumping to "P7"
My "pp_od_clk_voltage" setting:
OD_SCLK:
0: 852Mhz 800mV
1: 974Mhz 825mV
2: 1096Mhz 850mV
3: 1218Mhz 875mV
4: 1340Mhz 900mV
5: 1462Mhz 925mV
6: 1584Mhz 950mV
7: 1584Mhz 950mV
OD_MCLK:
0: 167Mhz 800mV
1: 500Mhz 800mV
2: 700Mhz 900mV
3: 800Mhz 950mV
OD_RANGE:
SCLK: 852MHz 2400MHz
MCLK: 167MHz 1500MHz
VDDC: 800mV 1200mV
Default "pp_od_clk_voltage" setting
OD_SCLK:
0: 852Mhz 800mV
1: 991Mhz 900mV
2: 1138Mhz 950mV
3: 1269Mhz 1000mV
4: 1312Mhz 1050mV
5: 1474Mhz 1100mV
6: 1538Mhz 1150mV
7: 1590Mhz 1200mV
OD_MCLK:
0: 167Mhz 800mV
1: 500Mhz 800mV
2: 700Mhz 900mV
3: 800Mhz 950mV
OD_RANGE:
SCLK: 852MHz 2400MHz
MCLK: 167MHz 1500MHz
VDDC: 800mV 1200mV
RYZEN 1700
MSI B350M MORTAR
PowerColor Radeon RX Vega 56
Linux 5.0.0-arch1-1-ARCH #1 SMP PREEMPT Mon Mar 4 14:11:43 UTC 2019 x86_64
GNU/Linux
Thanks!</pre>
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