linux-kernel - RE: Keyboard regression by intel-vbtn

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Message-ID: <DM6PR19MB2636FFC274423BB564A7532CFA320@DM6PR19MB2636.namprd19.prod.outlook.com>
Date:   Tue, 29 Sep 2020 14:25:12 +0000
From:   "Limonciello, Mario" <Mario.Limonciello@...l.com>
To:     Hans de Goede <hdegoede@...hat.com>,
        Barnabás Pőcze <pobrn@...tonmail.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.de>
Subject: RE: Keyboard regression by intel-vbtn

> -----Original Message-----
> From: Hans de Goede <hdegoede@...hat.com>
> Sent: Tuesday, September 29, 2020 7:54
> To: Limonciello, Mario; Barnabás Pőcze; Takashi Iwai
> Cc: Andy Shevchenko; platform-driver-x86@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: Keyboard regression by intel-vbtn
> 
> 
> [EXTERNAL EMAIL]
> 
> Hi,
> 
> On 9/29/20 2:27 PM, Limonciello, Mario wrote:
> >> I'm afraid that the only answer which I have to these questions
> >> is not helpful, but in my experience it is true: "firmware sucks".
> >
> > So FWIW there is a Dell 2-in-1 that has been conflated into this same issue.
> > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1822394
> 
> That is what a somewhat old kernel (5.0.0) which I guess may
> lack your fix to check the chassis-type.
> 
> Interesting that this actually is a 2-in-1 though.
> 
> Also interesting that according to the reporter this was
> triggered by a BIOS update.
> 
> If you by any chance can provide an acpidump with both the
> 1.2.0 and 1.4.0 BIOS versions that would be very interesting.

I requested on the Ubuntu bug for someone to provide these.

> 
> > Something that is confusing to me is that on the Windows side all these
> > machines use the same Intel driver for this infrastructure no matter the
> > OEM.
> > So they can't possibly be putting in quirk specific stuff in the driver side
> > can they?
> >
> > It has to make you wonder if some baseline assumptions made in the
> > driver early on around tablet mode support are completely false.
> 
> I'm not saying your wrong. If you can get Intel to provide
> us with some documentation, or Windows driver source code
> for this, then that would be great.
> 
> AFAICT the Linux driver currently is entirely based on
> reverse engineering.

That's correct it was originally reverse engineered.

Andy,

As there is no publicly available documentation, could you see if it would it be
possible to get someone internal to Intel to compare private documentation to the
driver to see if something basic is missing or done wrong?