[Bug 218686] Fail to set energy_performance_preference of amd processor on asus ga403uv

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218686

--- Comment #90 from derp (vderp@icloud.com) ---
There's no ideal diagnostic tool for that, as for frequencies they are seen as
something like that, but it was probably the same or very close without CPPC

(I wouldn't mind if all of these somehow got to 400Mhz instead of 1400Mhz
though)

cat /proc/cpuinfo|grep MHz|sort
cpu MHz         : 1395.796
cpu MHz         : 1396.448
cpu MHz         : 1397.373
cpu MHz         : 1397.388
cpu MHz         : 1397.403
cpu MHz         : 1397.414
cpu MHz         : 1397.434
cpu MHz         : 400.000
cpu MHz         : 400.000
cpu MHz         : 400.000
cpu MHz         : 400.000
cpu MHz         : 400.000
cpu MHz         : 400.000
cpu MHz         : 400.000
cpu MHz         : 400.000
cpu MHz         : 400.000

the main difference can be seen in amdgpu_top, which for some reason treats CPU
cores as GPU cores
it can show mW per Core, and even when frequency stays at 1400, the mW power
assigned to these cores is much much smaller, as well as total "GFX" power
which is the total APU power, I guess

"GFX" is now about 700 mW and "SoC" about 400mW when idle

power savings are about 1W for system idle and low-power activities

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