[Bug 221383] ideapad_laptop: Fn hotkeys stop emitting after s2idle resume on IdeaPad Slim 3 14ARP10 (Ryzen 7735HS)

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221383

--- Comment #27 from Mario Limonciello (AMD) (mario.limonciello@amd.com) ---
Yes as you noted for Windows it's important to note Windows needs to get into
what is called HW DRIPS.  Windows kernel waits some time for both software and
hardware to quiesce before activating HW DRIPS.  This is what Linux does
immediately when you have amd-pmc loaded.

So there ABSOLUTELY are some timing differences for Windows and Linux; and it
wouldn't be the first time timing exposed a bug; but it's shooting in the dark
to assign blame on timing without evidence of traces of activity to the EC.

If you DO want to shoot in the dark and try to change timing (for example delay
HW sleep) you can modify this:

https://github.com/torvalds/linux/commit/9f5595d5f03fd4dc640607a71e89a1daa68fd19d

Just drop the conditional there or add an extra msleep() call.

---

Regarding getting EC and PS2 traffic from Windows - I completely agree this
would be useful for this issue, but I don't know how to do this, maybe some
others do or you can see if some of the LLMs can help with this.

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