Re: [PATCH] Input: atkbd - skip deactivate for Xiaomi Redmi Book Pro 16 2026

[Dmitry Torokhov]

On Fri, Aug 28, 2026 at 02:22:39PM +0300, Alexei Turtanov wrote:
> The internal keyboard of the Xiaomi Redmi Book Pro 16 2026 (board TM2425)
> does not work: atkbd_probe() succeeds and every command is ACKed, but no
> scancodes ever arrive afterwards.
> 
> Testing on the hardware through serio_raw shows that ATKBD_CMD_RESET_DIS
> (0xF5) is the culprit. After 0xF5 the embedded controller keeps ACKing
> commands but stops delivering scancodes, and neither ATKBD_CMD_ENABLE
> (0xF4) nor ATKBD_CMD_RESET_BAT (0xFF) bring them back. Only re-enabling
> the keyboard interface at the controller level (i8042 command 0xAE, or
> rewriting the command byte as i8042_port_close() does) revives it.
> Running the init sequence without 0xF5 (0xED 0x00, 0xF3 0x00, 0xF4)
> keeps the keyboard working.
> 
> 'i8042.dumbkbd=1' also works around this, but then the driver never
> writes to the keyboard and the LEDs cannot be controlled. Use the
> existing atkbd_deactivate_fixup quirk instead, as done for the sibling
> TM2424 by commit 3a046db33bb9 ("Input: atkbd - skip deactivate for
> Xiaomi Book Pro 14's internal keyboard"). Tested on v7.2: keyboard,
> Caps Lock LED and s2idle suspend/resume all work.
> 
> DMI: XIAOMI REDMI Book Pro 16 2026/TM2425, BIOS RMAPT6B0P0909 05/22/2026
> 
> Fixes: 9cf6e24c9fbf ("Input: atkbd - do not skip atkbd_deactivate() when skipping ATKBD_CMD_GETID")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Alexei Turtanov <9alexei9@xxxxxxxxx>

Applied, thank you.

-- 
Dmitry