ThinkPad Multimedia Keys

J

jbo@

Developer
I have a Lenovo Thinkpad P2000 in front of me running FreeBSD 13.-0 RELEASE p4.
From previous Thinkpads (usually the Carbon series), I'm used that multimedia keys for volume & screen brightness just work out of the box.

On this Thinkpad P2000 the volume keys are working but the backlight keys are not doing anything.

I'd like to understand:
  • which component(s) of the system are responsible for handling these multimedia keys
  • where possible configuration(s) can happen
  • how to check whether this particular Thinkpad model is simply not supported
  • what the mechanism for adding support for this Thinkpad model would be
Any insights you guys are able & willing to share?
 
The problem with these keys is that every manufacturer implements them differently, even differently across different models of the same manufacturer. Have a look at acpi_video(4) and/or acpi_ibm(4) (there are a bunch of acpi_* modules).
 
Try adding Try adding
Code: 
hw.usb.usbhid.enable=1
to your /boot/loader.conf.local. if still doesn't work, try adding ig4 iicbus and iichid to your kld_list in rc.conf and see if helps.
 
Menelkir said:
Try adding Try adding
Code: 
hw.usb.usbhid.enable=1
to your /boot/loader.conf.local. if still doesn't work, try adding ig4 iicbus and iichid to your kld_list in rc.conf and see if helps.
Click to expand...
Thanks, I'll try that and report back!

Regarding iichid: If I am understanding the table at sysutils/iichid properly, there doesn't seem to be a version available for FreeBSD 13.0 amd64.
Or was this merged into the base system?
 
jbodenmann said:
Thanks, I'll try that and report back!

Regarding iichid: If I am understanding the table at sysutils/iichid properly, there doesn't seem to be a version available for FreeBSD 13.0 amd64.
Or was this merged into the base system?
Click to expand...
It's part of FreeBSD 13 now, you just need to load the modules.
 
Menelkir said:
Try adding Try adding
Code: 
hw.usb.usbhid.enable=1
to your /boot/loader.conf.local. if still doesn't work, try adding ig4 iicbus and iichid to your kld_list in rc.conf and see if helps.
Click to expand...
Unfortunately, neither of these approaches made the screen brightness keys work.

SirDice said:
The problem with these keys is that every manufacturer implements them differently, even differently across different models of the same manufacturer. Have a look at acpi_video(4) and/or acpi_ibm(4) (there are a bunch of acpi_* modules).
Click to expand...
I already had acpi_ibm(4) loaded. After loading acpi_video(4) the screen brightness keys are actually doing something: Pressing either the brightness-up or the brightness-down key will set they screen brightness to 100%.

Could somebody outline the process of adding support for this ThinkPad model? As I understand handling of these keys is done through ACPI kernel modules. Therefore, I should be able to locate the corresponding source code, modify it as necessary, compiling and loading the new kernel module, right? No need to mess with the kernel at all?
Would this be as easy as adding some mapping table in the corresponding acpi_* module given that all the interfaces already exist?
 
You must log in or register to reply here.
Back
Top