[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 #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)

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

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.

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