At last I have a working touchpad on my Lenovo ThinkBook 15 IIL!! :)
Ubuntu 20.04
Kernel: 5.4.0-42-generic
Steps to fix:
Do it as root:
$ sudo su
# apt update
# apt install acpidump iasl cpio
# cd /tmp
Get and disassemble the original acpi table:
# acpidump -b
# iasl -d dsdt.dat
Edit /tmp/dsdt.dsl:
- Search the HID of the touch pad: ELAN0634
- Search the next _STA method declaration (line 38922 in my case) and comment
out these four lines:
Method (_STA, 0, NotSerialized) // _STA: Status
{
//If ((TPVD == 0x45))
//{
Return (0x0F)
//}
//Return (Zero)
}
Probably the kernel calls the _STA method before the _REG method, so the
TPVD not yet initialized here.
Increment the version number. It’s the last parameter of the DefinitionBlock
(line 21 for me):
DefinitionBlock ("", "DSDT", 2, "LENOVO", "ICL ", 0x20170002)
Compile the dsl file:
# iasl -sa dsdt.dsl
Create initrd archive:
# mkdir -p kernel/firmware/acpi
# mv dsdt.aml kernel/firmware/acpi
# find kernel | cpio -H newc --create > /boot/acpi_fixed.cpio
Unfortunately the GRUB_EARLY_INITRD_LINUX_CUSTOM parameter in the
/etc/default/grub config file results in a messy output and non booting
system, so we need to create a custom script in /etc/grub.d directory
instead.
create and edit: /etc/grub.d/50_acpi_patch
copy these lines into it:
#!/bin/sh
sed -i -E 's/^(\s+initrd\s+)(.*)$/\1\/acpi_fixed.cpio \2/g'
/boot/grub/grub.cfg.new
Make it executable:
# chmod +x /etc/grub.d/50_acpi_patch
Update grub config:
# update-grub
Edit /etc/modprobe.d/blacklist.conf. Add these lines to the end of the
file:
#Allow module elan_i2c to control the touch pad
blacklist i2c_hid
Reboot:
# reboot
Be happy!
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1861610
Title:
'Elan touchpad' not detected on 'Lenovo ThinkBook 15 IIL'
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1861610/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
