Bug 216977

Summary:	asus t100 touchpad registered but not working
Product:	Drivers	Reporter:	jessegodfroy (jessegodfroy)
Component:	Input Devices	Assignee:	drivers_input-devices
Status:	RESOLVED CODE_FIX
Severity:	normal	CC:	jwrdegoede
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	6.1 and newer	Subsystem:
Regression:	No	Bisected commit-id:

Description jessegodfroy@gmail.com 2023-01-29 15:44:34 UTC

After upgrading the kernel from 6.0 series to the 6.1 the touchpad on my asus t100 no longer works. 

The device is registered in dmesg. I believe hid_asus is responsible for the keyboard and touchpad.  The keyboard continues to function, but the touchpad does not. 

Jan 29 09:29:53 t100ta-white kernel: asus 0003:0B05:17E0.0001: input,hidraw0: USB HID v1.11 Keyboard [ASUSTek COMPUTER INC. ASUS Base Station(T100)] on usb-0000:00:14.0-3/input0
Jan 29 09:29:53 t100ta-white kernel: asus 0003:0B05:17E0.0002: Fixing up Asus T100 keyb report descriptor
Jan 29 09:29:53 t100ta-white kernel: asus 0003:0B05:17E0.0002: input,hiddev96,hidraw1: USB HID v1.11 Device [ASUSTek COMPUTER INC. ASUS Base Station(T100)] on usb-0000:00:14.0-3/input1
Jan 29 09:29:53 t100ta-white kernel: asus 0003:0B05:17E0.0003: input,hiddev97,hidraw2: USB HID v1.11 Mouse [ASUSTek COMPUTER INC. ASUS Base Station(T100)] on usb-0000:00:14.0-3/input2

I do not see any changes to hid_asus that should be responsible for the change in performance.

Comment 1 Hans de Goede 2023-01-30 10:18:39 UTC

This is my bad, I accidentally broke SW_TABLET_MODE reporting on the Asus T100* and T101* series and it is now reporting that it is in tablet mode while it is actually docked and thus in laptop mode.

This is causing libinput to suppress touchpad events, as it would for a 360° hinges style 2 in 1 with the keyboard + touchpad folded behind the display (so in tablet mode).

I recently hit this myself on a T101HA and a fix for this has already been merged for 6.2-rc6:

"platform/x86: asus-wmi: Fix kbd_dock_devid tablet-switch reporting"

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fdcc0602d64f22185f61c70747214b630049cc33

And the fix is also queued for the next 6.1.y stable series release:

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/log/?h=queue/6.1