Fedora 40 - IdeaPad Flex 5 14ALC05 - Touch screen not working

[james454g]

The touch screen on this device does not work on the latest Fedora with a recent kernel, which includes the patch that supposedly fixed the issue for everyone a few years back.

Linux fedora 6.8.10-300.fc40.x86_64

I am facing the exact same issue as in this thread #218, where the hardware is clearly present however not being picked up by the driver. I have tried various distros and same deal.

Output of sudo find /sys/ -iname "*wacf*"

/sys/devices/platform/AMDI0010:00/i2c-0/i2c-WACF2200:00
/sys/devices/LNXSYSTM:00/LNXSYBUS:00/AMDI0010:00/WACF2200:00
/sys/bus/acpi/devices/WACF2200:00
/sys/bus/i2c/devices/i2c-WACF2200:00

Output of xinput --input on Wayland:

⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ xwayland-pointer:10                       id=6    [slave  pointer  (2)]
⎜   ↳ xwayland-relative-pointer:10              id=7    [slave  pointer  (2)]
⎜   ↳ xwayland-pointer-gestures:10              id=8    [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ xwayland-keyboard:10                      id=9    [slave  keyboard (3)]

On X11:

⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ MSFT0001:00 06CB:CE2D Touchpad            id=15   [slave  pointer  (2)]
⎜   ↳ MSFT0001:00 06CB:CE2D Mouse               id=16   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ Power Button                              id=8    [slave  keyboard (3)]
    ↳ Sleep Button                              id=9    [slave  keyboard (3)]
    ↳   USB Keyboard                            id=10   [slave  keyboard (3)]
    ↳   USB Keyboard System Control             id=11   [slave  keyboard (3)]
    ↳ Ideapad extra buttons                     id=14   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=17   [slave  keyboard (3)]
    ↳   USB Keyboard Consumer Control           id=18   [slave  keyboard (3)]

From all the reading I've done, I believe that MSFT0001:00 06CB:CE2D Mouse is supposed to be the touch screen, but I have no idea how to force detection.