https://bugs.kde.org/show_bug.cgi?id=477446
Bug ID: 477446
Summary: Feature request: adjust power profile to content type
Classification: Plasma
Product: kwin
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: peter.eszl...@gmail.com
Target Milestone: ---
https://gitlab.freedesktop.org/drm/amd/-/issues/1500#note_1487319
Alex Deucher (AMD):
"Adding a framerate limiter creates bubbles in the pipeline which means the GPU
sees less sustained load and so it doesn't ramp up as high as it would if there
were no limiter in place. pp_power_profile_mode allows you to adjust the
heuristics used to ramp up and down the clocks.
power_dpm_force_performance_level=high forces all of the clocks to high all of
the time is probably not what you want. Keeping them high all the time kills
your thermal and power headroom and likely causes throttling because they would
never naturally ramp down. Adjusting pp_power_profile_mode is the right
approach if the default heuristics are not working well for you. That is why
they are there. Changing the default to something more aggressive uses more
power, especially for lighter weight desktop workloads so there is always a
trade off.
Windows has the concept of a fullscreen 3D game mode so the driver can switch
the profile when that mode is requested. On Linux there is no similar concept.
A fullscreen 3D app is just an app that takes the full screen size. E.g., it
could be a game or it could just be the desktop compositor. I think ideally
for Linux, we'd have some user process, maybe as part of mesa, that knows that
the user wants to do and requests the appropriate profile. You can also take
into account the power source (AC vs. battery) and adjust the profile for that
as well if you want less aggressive heuristics when on battery power for
example."
Wayland has the content type protocol.
The "user process" would be "power-profiles-daemon", but that still needs GPU
support: https://gitlab.freedesktop.org/upower/power-profiles-daemon/-/issues/3
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