You have been subscribed to a public bug:
Lenovo Thinkbook 14 G7 ARP laptop.
Model: 21MV
Ryzen 5 7535HS.
Internal factory laptop keyboard.
Ubuntu 25.10.
What happened instead:
Simple pressing/releasing single Fn key produces the below in dmesg
(every single time):
[ +4.340795] atkbd serio0: Unknown key pressed (translated set 2, code 0xf8 on
isa0060/serio0).
[ +0.000019] atkbd serio0: Use 'setkeycodes e078 <keycode>' to make it known.
[ +0.009265] atkbd serio0: Unknown key released (translated set 2, code 0xf8
on isa0060/serio0).
[ +0.000013] atkbd serio0: Use 'setkeycodes e078 <keycode>' to make it known.
This is likely messing up of Volume up/down keys (Fn+F2,Fn+F3) and clogs
dmesg.
What expected to happen:
Fn key should be well defined (for Thinkbook 14 G7 ARP at least) and should not
produce "Unknown key pressed" messages in dmesg.
===============================================
sudo dmesg |grep i8042:
[ 0.566676] i8042: PNP: PS/2 Controller [PNP0303:KBD0] at 0x60,0x64 irq 1
[ 0.566681] i8042: PNP: PS/2 appears to have AUX port disabled, if this is
incorrect please boot with i8042.nopnp
[ 0.568551] serio: i8042 KBD port at 0x60,0x64 irq 1
[ 0.587423] input: AT Translated Set 2 keyboard as
/devices/platform/i8042/serio0/input/input2
00:14.3 ISA bridge [0601]: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge
[1022:790e] (rev 51)
No issues with keyboard in Win 11 (even with default generic keyboard driver).
Let me know if more info needed.
Thank you.
** Affects: linux-hwe-6.14 (Ubuntu)
Importance: Undecided
Status: New
** Tags: atkbd bot-comment fn keyboard setkeycodes
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Single Fn key press: atkbd serio0: Unknown key pressed (Thinkbook 14 G7 ARP,
Ubuntu 25.10, Ryzen)
https://bugs.launchpad.net/bugs/2129650
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