HI Alex,

HP is working in publishing HP BIOS to LVFS and the team is making progress.  
There are several BIOS published and it appears BIOS for your Elite Dragonfly is one of them.   
See https://fwupd.org/lvfs/firmware/10948.

The BIOS is applicable to notebooks with T90 type BIOS.  If you decide to try flashing the firmware, please do it at your own risk.

BIOS-System Firmware (1)
HP BIOS and System Firmware (T90)
Version: 01.09.10 Rev.A	



Regards,

Jorge Lopez
Hewlett-Packard 

“Once you stop learning, you start dying”
Albert Einstein

-----Original Message-----
From: Alex Dewar <redacted> 
Sent: Wednesday, July 13, 2022 3:17 AM
To: Lopez, Jorge A (Security) <jorge.lopez2@hp.com>; Hans de Goede <redacted>; dmitry.torokhov@gmail.com; tiwai@suse.de; markgross@kernel.org
Cc: linux-input@vger.kernel.org; linux-kernel@vger.kernel.org; platform-driver-x86@vger.kernel.org
Subject: Re: input/i8042: Malfunctioning brightness keys on HP Elite Dragonfly G2

On Mon, 2022-07-11 at 14:59 +0000, Lopez, Jorge A (Security) wrote:

Hi Alex,

Thank you for the BIOS information.   The problem you are experiencing 
was fixed in BIOS version 01.07.02 Rev.A

        - Fixes an issue where Fn+F3/F4 do not change the brightness 
of the display panel when the Privacy Panel is enabled in the F10 
settings.

The latest BIOS version is 01.09.01 Rev.A so the problem will be 
resolved after BIOS upgrade.    BIOS is not available via LVFS, you 
will need to install it via Windows executable.
https://support.hp.com/us-en/drivers/laptops

Let me know if the problem is resolved.

That worked a treat. Thanks!

And if you have an internal ticked called "Support Elitebooks on LVFS"
or similar, feel free to add my +1 to it 😉

Best,
Alex