linux-kernel - Re: ThinkPad T480s & thinkpad

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Message-ID: <20180608102910.24c2l43ffgwxalgq@pali>
Date:   Fri, 8 Jun 2018 12:29:10 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Henrique de Moraes Holschuh <ibm-acpi@....eng.br>,
        ibm-acpi-devel@...ts.sourceforge.net,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: ThinkPad T480s & thinkpad_acpi.ko

On Friday 08 June 2018 12:40:32 Andy Shevchenko wrote:
> On Fri, Jun 8, 2018 at 11:12 AM, Pali Rohár <pali.rohar@...il.com> wrote:
> > Hi! I just found out that thinkpad_acpi.ko is not automatically loaded
> > on new ThinkPad T480s. Is there any reason for it? Manually calling
> > modprobe thinkpad_acpi is working fine, but I would expect that it
> > should be loaded automatically.
> >
> > Here is dmesg output after loading it manually:
> >
> > thinkpad_acpi: ThinkPad ACPI Extras v0.25
> > thinkpad_acpi: http://ibm-acpi.sf.net/
> > thinkpad_acpi: ThinkPad BIOS N22ET34W (1.11 ), EC unknown
> > thinkpad_acpi: Lenovo ThinkPad T480s, model 20L7S03000
> > thinkpad_acpi: radio switch found; radios are enabled
> > thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
> > thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...
> > thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is unblocked
> > thinkpad_acpi: Standard ACPI backlight interface available, not loading native one
> 
> Did you run depmod -a?
> Is it present in the output?
> 
> There are three ways of enumeration as far as I can see from the driver's code:
> - by short driver name "tpacpi" (not likely our case)
> - by DMI matching (only for old BIOS'es)
> - by ACPI ID
> 
> So, does the ACPI contain one of the listed IDs?
> 
> #define TPACPI_ACPI_IBM_HKEY_HID        "IBM0068"
> #define TPACPI_ACPI_LENOVO_HKEY_HID     "LEN0068"
> #define TPACPI_ACPI_LENOVO_HKEY_V2_HID  "LEN0268"
> ?

DSDT contains only LEN0268. And so I found reason. I'm using Debian
which has only 4.9 kernel and LEN0268 identifier was added in git commit
a3c42a467a254a17236ab817d5c7c6bc054e4f84 for 4.10.

-- 
Pali Rohár
pali.rohar@...il.com