[Bug 216204] ideapad-laptop: Testing for DYTC platform-profile support

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216204

Hans de Goede (jwrdegoede@fedoraproject.org) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |jwrdegoede@fedoraproject.or
                   |                            |g
         Resolution|---                         |ANSWERED

--- Comment #1 from Hans de Goede (jwrdegoede@fedoraproject.org) ---
Sorry for the slow reply.

Note the kernel now allows enabling V4 DYTC support from the kernel
commandline, by passing: ideapad_laptop.allow_v4_dytc=1 on the kernel
commandline.

As for testing this:

1. Pass the kernel cmdline parameter
2. Check that switching the profile in GNOME results in the contents of
   /sys/firmware/acpi/platform_profile changing
3. Run a heavy workload, e.g. a make -j8 kernel compile
4. Monitor the power-consumption in powertop (while running from battery)
5. Change the profile

Step 5. should then result in significant changes of consumed power (this may
take some minutes to register).

Without platform_profile support the GNOME setting only changes the pstate
governer  profile, so things will ramp up slower. The actual platform_profile
setting should change the RAPL values / should change the maximum energy
consumption (programmable TPD) of the processor.

Note that this may only take effect when combined with running thermal-profiled
with the experimental Intel DPTF support enabled.

Since there is not really a bug to fix here I'm going to close this bug report
now.

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are watching the assignee of the bug.