Fixing ThinkBook Trackpad On Fedora

I recently purchased a new Lenovo ThinkBook 14 and installed Fedora, unfortunately there is an issue with BIOS preventing the trackpad from working correctly.

Luckily I came across this bug report with a solution, however, since I was using Fedora a few tweaks had to be made. I also knew from another RedHat bug report it was possible for it to work on Fedora.

Below are the steps I took to accomplish this (assume all are sudo):

1. dnf install acpidump iasl cpio
2. acpidump -b
3. iasl -d dsdt.dat
4. vim dsdt.dsl

5. Locate TPVD == 0x45 and comment out block like below:

    Method (_STA, 0, NotSerialized)  // _STA: Status
      {
        //If ((TPVD == 0x45))
          //{
              Return (0x0F)
          //}
          //Return (Zero)
      }
   

6. On line 21, increment the version number like so: DefinitionBlock ("", "DSDT", 2, "LENOVO", "ICL ", 0x20170002)
7. iasl -sa dsdt.dsl
8. cp dsdt.aml /boot/acpi_fixed.aml
9. vim /boot/efi/EFI/fedora/custom.cfg and add to the file acpi /acpi_fixed.aml
10. grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

11. vim /etc/modprobe.d/blacklist.conf and add the following:

    #Allow module elan_i2c to control the touch pad
    blacklist i2c_hid
    

12. Reboot

Good luck!

2020-09-10 howto