[ISSUE] thinkpad_acpi kernel module not picking up parameters from /etc/modprobe.d/*

[ISSUE] thinkpad_acpi kernel module not picking up parameters from /etc/modprobe.d/*

[runrin]

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New issue by runrin on void-packages repository

https://github.com/void-linux/void-packages/issues/43120

Description:
### Is this a new report?

Yes

### System Info

Void 6.1.21_1 x86_64 AuthenticAMD uptodate rrrmFFFFFFF

### Package(s) Affected

linux6.1-6.1.21_1

### Does a report exist for this bug with the project's home (upstream) and/or another distro?

_No response_

### Expected behaviour

should be able to send commands to `/proc/acpi/ibm/fan`. for example: `echo 'level auto' > /proc/acpi/ibm/fan`

### Actual behaviour

cannot send commands to `/proc/acpi/ibm/fan` because `thinkpad_acpi.fan_control=1` is not being set correctly at boot.

Immediately after a reboot:
```
# cat /etc/modprobe.d/thinkpad_acpi.conf
options thinkpad_acpi fan_control=1

# cat /sys/module/thinkpad_acpi/parameters/fan_control
N

# echo 'level auto' > /proc/acpi/ibm/fan
echo: write error: invalid argument  
```

### Steps to reproduce

1. add the kernel module thinkpad-acpi by running: `modprobe thinkpad_acpi`
2. create a file in modprobe.d that contains the line `options thinkpad_acpi fan_control=1`
3. reboot
4. run `cat /sys/module/thinkpad_acpi/parameters/fan_control`. it will be incorrectly set to `N`

---

running `rmmod thinkpad_acpi`, then `modprobe thinkpad_acpi` to remove and add the module fixes the issue. when re-added the module gets the parameter from any file in `/etc/modprobe.d/*` like this:

```
# cat /etc/modprobe.d/thinkpad_acpi.conf
options thinkpad_acpi fan_control=1

# cat /sys/module/thinkpad_acpi/parameters/fan_control
N

# cat /proc/acpi/ibm/fan
status:         enabled
speed:          3900
level:          auto

# rmmod thinkpad_acpi
# modprobe thinkpad_acpi

# cat /sys/module/thinkpad_acpi/parameters/fan_control
Y

# cat /proc/acpi/ibm/fan
status:         enabled
speed:          3900
level:          auto
commands:       level <level> (<level> is 0-7, auto, disengaged, full-speed)
commands:       enable, disable
commands:       watchdog <timeout> (<timeout> is 0 (off), 1-120 (seconds))
```

adding `thinkpad_acpi.fan_control=1` to the kernel command line also fixes the problem and it will be set correctly on boot.

---

i first noticed this issue with 6.1.20_1 and initially reported it [here](https://bugzilla.kernel.org/show_bug.cgi?id=217225).