[SOLVED] Radeon 6800 XT: 100% GPU core usage & 74 Watts when idle
On 23/07/2021 23:44, The Wanderer wrote:
https://gitlab.freedesktop.org/drm/amd/-/issues/1632 as being an
upstream(?) bug report which covers it. Not sure how directly applicable
those are, but just in case...
That escalated very quickly :D This bug is responsible for this. And
patch works.
I compiled my own 5.10 kernel using Debian source, and I patched that
one line in drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c file. Now I rebooted
to my custom 5.10 kernel and it works :)
Let's see - before:
$ sensors
(...)
amdgpu-pci-0900
(...)
power1: 74.00 W (cap = 272.00 W)
gpu-mon (from rickslab-gpu-utils)
┌─────────────┬────────────────────┐
│Card # │card0 │
├─────────────┼────────────────────┤
│Model │ Navi 21 RX │
│GPU Load % │99 │
│Mem Load % │0 │
│VRAM Usage % │4.839 │
│GTT Usage % │0.802 │
│Power (W) │75.0 │
│Power Cap (W)│272.0 │
│Energy (kWh) │0.0 │
│T (C) │53.0 │
│VddGFX (mV) │1143 │
│Fan Spd (%) │0 │
│Sclk (MHz) │2470 │
│Sclk Pstate │1 │
│Mclk (MHz) │1000 │
│Mclk Pstate │3 │
│Perf Mode │0-BOOTUP_DEFAULT │
└─────────────┴────────────────────┘
And after:
$ sensors
(...)
amdgpu-pci-0900
(...)
power1: 34.00 W (cap = 272.00 W)
┌─────────────┬────────────────────┐
│Card # │card0 │
├─────────────┼────────────────────┤
│Model │ Navi 21 RX │
│GPU Load % │0 │
│Mem Load % │0 │
│VRAM Usage % │6.109 │
│GTT Usage % │1.147 │
│Power (W) │35.0 │
│Power Cap (W)│272.0 │
│Energy (kWh) │0.004 │
│T (C) │54.0 │
│VddGFX (mV) │856 │
│Fan Spd (%) │0 │
│Sclk (MHz) │500 │
│Sclk Pstate │0 │
│Mclk (MHz) │1000 │
│Mclk Pstate │3 │
│Perf Mode │0-BOOTUP_DEFAULT │
└─────────────┴────────────────────┘
0% GPU core use, 0% memory use, core clock is 500 MHz instead of maxed
out at 2470 Mhz. Success!
Power usage is on par with Windows.
However, I still have 34W even if I disconnect second monitor. On
Windows, with one monitor only power goes down to 10W and core is 10
MHz. But my default setup it 2 monitors so I don't worry too much anyway :)
--
With kindest regards, piorunz.
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