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

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Date:   Fri, 30 Sep 2022 13:20:42 +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 #forregzbot

TWIMC: this mail is primarily send for documentation purposes and for
regzbot, my Linux kernel regression tracking bot. These mails usually
contain '#forregzbot' in the subject, to make them easy to spot and filter.

On 26.09.22 16:25, Thorsten Leemhuis wrote:
> 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

Looks like nobody yet check if the problem happens with mainline, so
let's stick to the backport for now:

#regzbot introduced: 0fbb5ce2f4267

> 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.