The post-install service to fix usb-c does not enable on my KANO

The post-install service to fix usb-c does not enable on my KANO chromebook.

What I did - created the file in /etc/systemd/system as instructed.

[Unit]
Description=Enable USB-C on chromebook

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStartPre=/sbin/modprobe -r -a cros-ec-typec intel-pmc-mux
ExecStart=/sbin/modprobe -a intel-pmc-mux cros-ec-typec

[Install]
WantedBy=multi-user.target

I tried to enable it: sudo systemctl enable --now chromebook-usbc.service

It should have enabled without error, instead it failed to enable:

xyz@deb714:/etc/systemd/system$ sudo systemctl enable --now chromebook-usbc.service
Job for chromebook-usbc.service failed because the control process exited with error code.
See "systemctl status chromebook-usbc.service" and "journalctl -xeu chromebook-usbc.service" for details.

The recommended debugging steps yielded the following:

xyz@deb714:~$ systemctl status chromebook-usbc.service
× chromebook-usbc.service - Enable USB-C on chromebook
     Loaded: loaded (/etc/systemd/system/chromebook-usbc.service; enabled; preset: enabled)
     Active: failed (Result: exit-code) since Fri 2024-04-05 15:24:31 CDT; 2min 23s ago
    Process: 1942 ExecStartPre=/sbin/modprobe -r -a cros-ec-typec intel-pmc-mux (code=exited, status=1/FAILURE)
        CPU: 7ms

sudo journalctl -xeu chromebook-usbc.service
Apr 05 15:24:31 deb714 systemd[1]: Starting chromebook-usbc.service - Enable USB-C on chromebook...
░░ Subject: A start job for unit chromebook-usbc.service has begun execution
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░ 
░░ A start job for unit chromebook-usbc.service has begun execution.
░░ 
░░ The job identifier is 1981.
Apr 05 15:24:31 deb714 modprobe[1942]: modprobe: WARNING: Module intel_pmc_mux is in use.
Apr 05 15:24:31 deb714 systemd[1]: chromebook-usbc.service: Control process exited, code=exited, status=1/FAILURE
░░ Subject: Unit process exited
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░ 
░░ An ExecStartPre= process belonging to unit chromebook-usbc.service has exited.
░░ 
░░ The process' exit code is 'exited' and its exit status is 1.
Apr 05 15:24:31 deb714 systemd[1]: chromebook-usbc.service: Failed with result 'exit-code'.
░░ Subject: Unit failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░ 
░░ The unit chromebook-usbc.service has entered the 'failed' state with result 'exit-code'.
Apr 05 15:24:31 deb714 systemd[1]: Failed to start chromebook-usbc.service - Enable USB-C on chromebook.
░░ Subject: A start job for unit chromebook-usbc.service has failed
░░ Defined-By: systemd
░░ Support: https://www.debian.org/support
░░ 
░░ A start job for unit chromebook-usbc.service has finished with a failure.
░░ 
░░ The job identifier is 1981 and the job result is failed.

OS Linux deb714 6.6.10-chrultrabook #1 SMP PREEMPT_DYNAMIC Tue Jan 9 04:03:43 UTC 2024 x86_64 GNU/Linux Coreboot Firmware version: and Device:

Acer Chromebook Spin 714 [CP714-1WN] (Kano)
FW: MrChromebox-4.22.2-5-g822782a1001
13th Gen Intel (R) Core (TM) i5-1335U
(as reported during boot, although it's actually CP714-2W-56B2)

Additional context

Acer Chromebook Spin 714 (2023)
(details courtesy PcWorld)
* CPU: Intel Core i5-1335U
* Memory: 8GB LPDDR4X
* Graphics/GPU: Intel Iris Xe Graphics
* Display: 1,920 x 1,200 60Hz LCD Touchscreen
* Storage: 256GB PCIe NVMe
* Webcam: 1440p
* Connectivity:  2x Thunderbolt 4 / USB-C, 1x USB-A, 1x HDMI, 1x 3.5mm combo audio
* Networking: Wi-Fi 6E, Bluetooth 5.2
* Biometrics: None
* Battery capacity: 42 watt-hours
* Dimensions: 12.3 x 8.8 x 0.71 inches
* Weight: 3.02

on case:
Model No.: N22Q10
CP714-2W-5612
Mfg Date: 2023/10/28

reported at the command line:
architecture: x86_64
board name: KANO
Cpu Model: i5-1335U
Cpu Gen: 13th

KANO-VJXU
CP714-2W-56B2

chrultrabook / bugtracker

The post-install service to fix usb-c does not enable on my KANO #5