Comment # 6 on bug 1192181 from Andreas Nordal

> any error messages from hp-wmi module when you press brightness keys?

Nope. That would show in `dmesg --follow`, right? Nothing happens there when
pressing the brightness keys. Only some other keys, which "atkbd serio0"
complains about being unassigned. One of them is the WiFi key, which actually
works despite being unassigned.

> what happens if you blacklist hp_wmi module?

Same symptom: They still toggle the microphone instead.

To test that, I did `sudo rmmod hp_wmi` and watched with `lsmod | grep hp_wmi`,
both before and after, that the module was indeed loaded and got unloaded.

However, this appeared in `dmesg --follow` when I modprobed it back again:

[111350.270375] hp_wmi: query 0x4 returned error 0x5
[111350.276807] hp_wmi: query 0xd returned error 0x5
[111350.276931] input: HP WMI hotkeys as /devices/virtual/input/input87
[111350.292560] hp_wmi: query 0x1b returned error 0x5