Re: [Regression] Bug 216360 - No power to DVD drive

From: "Rafael J. Wysocki" <rafael@kernel.org>
To: Thorsten Leemhuis <regressions@leemhuis.info>
Cc: bhealey@live.co.uk,
	 "regressions@lists.linux.dev" <regressions@lists.linux.dev>,
	"Rafael J. Wysocki" <rafael@kernel.org>
Subject: Re: [Regression] Bug 216360 - No power to DVD drive
Date: Sat, 27 Aug 2022 15:56:57 +0200	[thread overview]
Message-ID: <CAJZ5v0ioAP9R=NcTS+m_i-vGtJfQd7vgLAa_Os6W=DvTf=8V3Q@mail.gmail.com> (raw)
In-Reply-To: <e9cf6b9e-df35-ab3a-4e9f-d73e2757a870@leemhuis.info>

On Sat, Aug 27, 2022 at 3:39 PM Thorsten Leemhuis
<regressions@leemhuis.info> wrote:
>
> On 27.08.22 13:54, Rafael J. Wysocki wrote:
> > On Fri, Aug 26, 2022 at 12:13 PM Thorsten Leemhuis
> > <regressions@leemhuis.info> wrote:
> >>
> >> Hi Rafael. Could you help me out if you have a minute? I noticed
> >> a regression report in bugzilla that nobody looked at yet. According to
> >> the reporter the DVD drive's drawer of a small form factor system won't
> >> open anymore since v5.16; the device is not even mentioned anymore in
> >> the dmesg output. For details see:
> >>
> >> https://bugzilla.kernel.org/show_bug.cgi?id=216360
> >>
> >> Is that an ACPI problem and thus something you would handle?
> > I honestly don't think so.
>
> Okay, already suspected that, thx.
>
> >> If not: in which direction would you shove this?
> >
> > See https://bugzilla.kernel.org/show_bug.cgi?id=216360#c6
> >
> > This issue is not reported against the mainline kernel, so it should
> > be handled by whoever provided the kernel the reporter is using.
>
> Well, you for sure have a point. But well, from what I can tell the
> Manjaro kernel is not heavily patched (see
> https://gitlab.manjaro.org/packages/core/linux519; but the RT in the
> kernel's name makes me suspicious).

Even so, it is not the mainline and that's what we work on.

> And from my experience quite a few
> developer seem to be interested in regression reports from such kernels.
> That's why I (for now) pick some of them up (I use my best judgement
> here) and let the developers decide what to do with them.

Well, if you are absolutely sure that the third-party modifications
cannot be involved in the observed failure and you have the time to
assist the reporter, it is fine.  Otherwise you may not be helping.

> In this case I just don't really know whom to ask to look into this. :-/

Me neither.

> Anyway, Bruce, things really look a bit odd in this case. You should try
> to seek help from Manjaro -- or check if it really happens with a
> vanilla kernel(¹).

Good advice.

> If you do the latter, ideally consider to use "git
> bisect" to find the change that is causing the different behavior. Then
> we know for sure who needs to look into this.

Right.

> See also:
>
> https://docs.kernel.org/admin-guide/reporting-issues.html
> https://docs.kernel.org/admin-guide/reporting-regressions.html
>
> Ciao, Thorsten
>
> (¹) e.g. try a vanilla 5.15 kernel to see if your DVD works; use the
> config from the Manjaro 5.15 kernel (consider running "make
> localmodconfig" to reduce build times). Then compile a 5.16 vanilla
> kernel with the config from your 5.15 kernel processed by 'make
> olddefconfig'