[Bug 220246] Dell Latitude 5400: Mic Mute key stopped to work in v6.15

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220246

--- Comment #9 from Kurt Borja (kuurtb@gmail.com) ---
On Wed Jun 18, 2025 at 4:42 PM -03, bugzilla-daemon wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=220246
>
> --- Comment #6 from Dmytro Bagrii (dimich.dmb@gmail.com) ---
> Full dmesg output attached:
> https://bugzilla.kernel.org/attachment.cgi?id=308287
>
> dmesg output after single Mic Mute key press in 6.15:
>
> dell_wmi: Received WMI event (00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00)

Yep, this is the problem. Can you please bisect the WMI core commits
from this cycle? This should do the trick:

$ git bisect start v6.15 v6.14 -- drivers/platform/x86/wmi.c

You are using Arch so you can use

$ make localmodconfig
$ make -j$(nproc) pacman-pkg

to compile.

Maybe (Cc+) Armin Wolf can give us some insight too.

>
> Compare to 6.14.10:
>
> dell_wmi: Received WMI event (02 00 10 00 50 01 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00)
> dell_wmi: Process buffer (02 00 10 00 50 01)
> dell_wmi: Key with type 0x0010 and code 0x0150 pressed

@Armin JFYI:

I have this exact event in my system (Alienware x15 r1) but I can't
reproduce the bug. The WMI event is received just fine.

I also tried upstream v6.15 and v6.16 and this event still works fine.

>
> Also I noted difference in loaded modules. `lsmod | grep dell` In 6.15:
>
> dell_pc                12288  0
> platform_profile       16384  1 dell_pc
> dell_rbtn              20480  0
> dell_laptop            45056  0
> dell_smm_hwmon         28672  0
> dell_wmi               28672  1 dell_laptop
> dell_smbios            36864  3 dell_wmi,dell_pc,dell_laptop
> dell_wmi_sysman        61440  0
> firmware_attributes_class    12288  1 dell_wmi_sysman
> dcdbas                 20480  1 dell_smbios
> dell_wmi_descriptor    20480  2 dell_wmi,dell_smbios
> dell_lis3lv02d         16384  0
> dell_smo8800           16384  0
> rfkill                 45056  9
> iwlmvm,bluetooth,dell_laptop,dell_rbtn,cfg80211
> sparse_keymap          12288  2 intel_hid,dell_wmi
> video                  81920  3 dell_wmi,dell_laptop,i915
> wmi                    32768  7
>
> dell_wmi_sysman,video,dell_wmi,wmi_bmof,dell_smm_hwmon,dell_smbios,dell_wmi_descriptor
>
> Compare to 6.14.10:
>
> dell_pc                12288  0
> platform_profile       16384  1 dell_pc
> dell_rbtn              20480  0
> dell_laptop            45056  0
> dell_smm_hwmon         28672  0
> dell_wmi               28672  1 dell_laptop
> dell_smbios            36864  3 dell_wmi,dell_pc,dell_laptop
> dcdbas                 20480  1 dell_smbios
> dell_wmi_sysman        61440  0
> dell_lis3lv02d         16384  0
> firmware_attributes_class    12288  1 dell_wmi_sysman
> dell_wmi_descriptor    20480  2 dell_wmi,dell_smbios
> rfkill                 40960  9
> iwlmvm,bluetooth,dell_laptop,dell_rbtn,cfg80211
> dell_smo8800           16384  0
> sparse_keymap          12288  2 intel_hid,dell_wmi
> video                  81920  3 dell_wmi,dell_laptop,i915
> i8042                  57344  1 dell_laptop
> wmi                    32768  7
>
> dell_wmi_sysman,video,dell_wmi,wmi_bmof,dell_smm_hwmon,dell_smbios,dell_wmi_descriptor
>
> Note in "good" case i8042 is loaded and used by dell_laptop module, in "bad"
> case it isn't.
> I modprobed i8042 in 6.15 just in case. Expectedly, it had no effect.

Yes, as you already mentioned the i8042 module is unrelated to this bug.

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