[Bug 220945] New: ASUS Q405UA requires tablet_mode_sw=2 for proper tablet mode detection

[Bug 220945] New: ASUS Q405UA requires tablet_mode_sw=2 for proper tablet mode detection

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220945

            Bug ID: 220945
           Summary: ASUS Q405UA requires tablet_mode_sw=2 for proper
                    tablet mode detection
           Product: Drivers
           Version: 2.5
    Kernel Version: 6.17.12-300.fc43.x86_64
          Hardware: Intel
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Platform_x86
          Assignee: drivers_platform_x86@kernel-bugs.osdl.org
          Reporter: andy.r.blank@gmail.com
        Regression: No

Created attachment 309126
  --> https://bugzilla.kernel.org/attachment.cgi?id=309126&action=edit
Terminal output for uname, dmidecode, dmesg, input devices, & evtest

The ASUS Q405UA 2-in-1 convertible laptop does not properly expose the
SW_TABLET_MODE switch with the default tablet_mode_sw=-1 (auto-detect) setting
in the asus-nb-wmi driver.
DMI Information: Product Q405UA, Board Q405UA, BIOS Q405UA.308, Chassis Type 31
(Convertible)
CURRENT BEHAVIOR: With default settings (tablet_mode_sw=-1), no SW_TABLET_MODE
switch is exposed. The Embedded Controller (EC) correctly disables the keyboard
when folding past 180 degrees. KEY_PROG2 events are generated on hinge
transitions via /dev/input/event14 (Asus WMI hotkeys). Touchpad remains active
in tablet mode because no tablet mode switch is available for userspace.
EXPECTED BEHAVIOR: SW_TABLET_MODE switch should be automatically exposed.
Tablet mode state should change when laptop is folded past 180 degrees.
Userspace (libinput/KDE/GNOME) should be able to automatically disable touchpad
in tablet mode.
WORKAROUND: Setting tablet_mode_sw=2 (lid-flip detection) in the asus-nb-wmi
module parameters properly exposes the SW_TABLET_MODE switch and resolves the
issue. Create /etc/modprobe.d/asus-nb-wmi.conf with: options asus_nb_wmi
tablet_mode_sw=2
PROPOSED SOLUTION: Add a DMI quirk for the ASUS Q405UA to automatically set
tablet_mode_sw=2, similar to other models in the asus-nb-wmi driver
(drivers/platform/x86/asus-nb-wmi.c).
SYSTEM INFORMATION: Model ASUS Q405UA, Kernel 6.17.12-300.fc43.x86_64,
Distribution Fedora 43
DRIVER MESSAGES (from dmesg): asus_wmi: ASUS WMI generic driver loaded,
asus_wmi: Initialization: 0x1, asus_wmi: BIOS WMI version: 9.0, asus_wmi: SFUN
value: 0x21, asus-nb-wmi asus-nb-wmi: Detected ATK, not ASUSWMI, use DSTS,
input: Asus WMI hotkeys as /devices/platform/asus-nb-wmi/input/input20
TESTING RESULTS: With tablet_mode_sw=2 configured, evtest shows Event code 1
(SW_TABLET_MODE) is present. Switch state correctly toggles between 0 (laptop)
and 1 (tablet) when folding. libinput debug-events shows proper SWITCH_TOGGLE
events. Touchpad automatically disables in tablet mode as expected.
ADDITIONAL NOTES: The EC already tracks hinge position (evidenced by automatic
keyboard disabling). KEY_PROG2 events fire on hinge transitions but are
insufficient for userspace to properly detect tablet mode. Other ASUS 2-in-1
models with similar behavior may also benefit from this quirk.

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[Bug 220945] ASUS Q405UA requires tablet_mode_sw=2 for proper tablet mode detection

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220945

Andrew (andy.r.blank@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Andrew (andy.r.blank@gmail.com) ---
I didn't read the landing page that this is not for kernels in existing
distros.

"If you did not compile your own kernel from scratch, you are probably in the
wrong place.
Please use the following links to report a bug to your distribution instead"

Closing this to file with Fedora.

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