[Bug 221142] ucsi_acpi actively breaks USB-C PD charging on Lenovo Legion Pro 7 (Arrow Lake)

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221142

--- Comment #3 from Wei Huang (huangwei@kylinos.cn) ---
Hi Alstergee,

Thanks for the detailed DMI info - and for the note about the AMD
sibling (83RU). I've kept the quirk to 83F5 for now, since the failure
is only confirmed on your model; 83RU can be added once someone
confirms it there.

A patch has been submitted to the linux-usb mailing list:

    usb: typec: ucsi: do not register UCSI on Lenovo Legion Pro 7 16IAX10H
   
https://lore.kernel.org/linux-usb/20260826034658.2170407-1-huangwei@kylinos.cn/

It adds a DMI quirk that makes ucsi_acpi skip binding on this model,
which is functionally the same as the blacklist workaround you already
verified - the module can stay loaded, but it will not touch the EC's
UCSI mailbox.

If you have a chance to test it (build a kernel with the patch applied,
make sure ucsi_acpi is no longer blacklisted, and reboot), the
confirmation I'd need is:

  - a dmesg line like:
        ucsi_acpi USBC000:00: UCSI implementation in firmware is broken,
ignoring
  - normal PD charging restored (voltage_now non-zero, chargers hold).

If that works, it would help to have a formal Tested-by tag from you,
which lets the subsystem maintainer pick the fix up directly. Just reply
with:

    Tested-by: Alex Bartz <alex@alstergee.com>

Thanks again for the quick and thorough help!

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