Good day everyone,

Since linux 5.8 I'm experiencing a problem related to power source
detection on my laptop. My machine is equipped with 2 typec ports, one
of them has power delivery and is used for charging, another one has
only data transfer capability. The issue is, when I unplug the power
cable, the OS is reporting something like "Battery at 100%, plugged in
but still discharging" (KDE Plasma notification) - whether another
port is used or not. I checked with upower, you can see the output for
kernel 5.4 and 5.10 attached. In brief, on 5.8 onwards I have some
"line_power_ucsi_source_psy_USBC000o001" device which is considered a
power supply and that prevents OS to switch to "battery mode" when
unplugging the cable, instead it thinks there's a power source but not
powerful enough to charge the battery, upower says this: "on-battery:
    no", but actually no ac power source is connected.
I did some research with git bisect up to the merge commit
`e611c0fe318c6d6827ee2bba660fbc23cf73f7dc` ("Merge tag 'usb-5.8-rc1'
of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb"), and
looked through its content. My wild guess based on upower output is
that a new driver introduced there, /drivers/usb/typec/ucsi/psy.c, is
responsible for this wrong behavior.

Could you please look into that based on info I'm providing?
Thank you!

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Best regards,
Vladimir Yerilov