linux-kernel - Dell laptop function keys stopped working between 5.10.46 and 5.13.9

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Message-ID: <b8ff8f68-4d5a-7ec6-4c4f-9f5be6e70ab5@molgen.mpg.de>
Date:   Mon, 16 Aug 2021 11:48:17 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Dell.Client.Kernel@...l.com, Matthew Garrett <mjg59@...f.ucam.org>,
        Pali Rohár <pali@...nel.org>
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Dell laptop function keys stopped working between 5.10.46 and 5.13.9

Dear Linux folks,


On a Dell Latitude E7250, updating Linux from 5.10.46 to 5.13.9 (Debian 
sid/unstable) the two function keys to (un-)mute the microphone, and 
enable/disable Wifi stopped working. The other function keys continue to 
work. The `evtest` output did not change.

     Linux version 5.10.0-8-amd64 (debian-kernel@...ts.debian.org) 
(gcc-10 (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for 
Debian) 2.35.2) #1 SMP Debian 5.10.46-4 (2021-08-03)

     Event: time 1629104514.184947, type 4 (EV_MSC), code 4 (MSC_SCAN), 
value 88
     Event: time 1629104514.184947, type 1 (EV_KEY), code 240 
(KEY_UNKNOWN), value 2

     Linux version 5.13.0-trunk-amd64 (debian-kernel@...ts.debian.org) 
(gcc-10 (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for 
Debian) 2.35.2) #1 SMP Debian 5.13.9-1~exp2 (2021-08-10)

     Event: time 1629103829.341409, type 4 (EV_MSC), code 4 (MSC_SCAN), 
value 88
     Event: time 1629103829.341409, type 1 (EV_KEY), code 240 
(KEY_UNKNOWN), value 2

The output of `acpi_listen` also did not change.

     $ acpi_listen
      9DBB5994-A997- 000000d0 00000000

Are you aware of such reports?


Kind regards,

Paul