linux-kernel - Re: [regression] Bug 216426 - USB-C port is incorrectly reporting that it's powered when Dell XPS 15-9500 is unplugged

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Date:   Mon, 26 Sep 2022 16:25:47 +0200
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [regression] Bug 216426 - USB-C port is incorrectly reporting
 that it's powered when Dell XPS 15-9500 is unplugged

On 01.09.22 11:07, Thorsten Leemhuis wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=216426
> 
>>  Mattia Orlandi 2022-08-29 17:04:21 UTC
>>
>> System
>> ------
>> - Dell XPS 15 9500
>> - 5.19.4 kernel
>>
>> Problem description
>> -------------------
>> Whenever I plug and then unplug my laptop from AC power using the USB-C port, the system thinks it is still plugged in (i.e., the KDE applet reports "Plugged in but still discharging").
>> If I check in Dell's BIOS, it correctly reports when the power supply is plugged/unplugged; `acpi -V` also correctly shows `Adapter 0: off-line`.
>>
>> On the other hand, `upower -d` incorrectly reports `/org/freedesktop/UPower/devices/line_power_ucsi_source_psy_USBC000o002` as `online: yes`.
>> Moreover, `journalctl` reports `ucsi_acpi USBC000:00: ucsi_handle_connector_change: GET_CONNECTOR_STATUS failed (-110)`.
>>
>> I'm testing the LTS kernel (5.15.63) and the issue does not occur, so I assume it's a regression bug, possibly introduced in kernel 5.18 (I tried downgrading the kernel to version 5.18.16 and the issue was already present).
> 
> See the ticket for more details. Apologies if I forwarded it to the
> wrong folks, I cover a lot of ground and thus sometimes get things
> wrong. :-/
> 
> BTW, I'd also like to add the report to the list of tracked regressions
> to ensure it's doesn't fall through the cracks in the end:
> 
> #regzbot introduced: v5.15..v5.18
> https://bugzilla.kernel.org/show_bug.cgi?id=216426
> #regzbot ignore-activity

#regzbot introduced: f7090e0ef360d674f0

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)

P.S.: As the Linux kernel's regression tracker I deal with a lot of
reports and sometimes miss something important when writing mails like
this. If that's the case here, don't hesitate to tell me in a public
reply, it's in everyone's interest to set the public record straight.