[solved]How to make my laptop support touchpad?

[hc1997]

My touch pad can not work. I can not find my touchpad info in dmesg or xinput list.
However, when I use a ubuntu live cd, the touchpad works.
it's dmesg shows:

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[1.423040]input：SYNA2BA6:00 06CB:CE78 Touchpad as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-1/i2c-SYNA2BA6:00/0018:06CB:CE78.0001/input/input5.
[1.490159]input: SYNA2BA6:00 06CB:CE78 Touchpad as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-1/i2c-SYNA2BA6:00/0018:06CB:CE78.0001/input/input8.

I also aimed at the output of lsmod in ubuntu to compile kernel in Gentoo, but still doesn't work.
I have tried to compile too many kernel options into builtin(*) or module(M) and make my kernel so heavy, but the touchpad still doesn't work.

Thanks, I have solved this problem with your help.

[NeddySeagoon]

hc1997,

You need pinctrl support for your hardware.
You need i2c support for your handware.
Last but not least, i2c_designware support is required.

For further help please post the output of

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lspci -nnk

which will tell us about your hardware and put your kernel .config file onto a pastebin. wgetpaste will help there.

[hc1997]

hc1997,

You need pinctrl support for your hardware.
You need i2c support for your handware.
Last but not least, i2c_designware support is required.

For further help please post the output of

Code: Select all

lspci -nnk

which will tell us about your hardware and put your kernel .config file onto a pastebin. wgetpaste will help there.

Here are the output in my gentoo:
kernel config:https://pastebin.com/Gps7e1cA
lspci -nnk:https://pastebin.com/d8sgS7Rd

The touchpad in my ubuntu live cd works.
So I am glad to post the same information in my ubuntu live cd as below:
kernel config:https://pastebin.com/3zNqp3kp
lspci -nnk:https://pastebin.com/6byBfWmq

Thanks!

[NeddySeagoon]

From your gentoo,

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00:15.0 Serial bus controller [0c80]: Intel Corporation Raptor Lake Serial IO I2C Host Controller #0 [8086:7a4c] (rev 11)
	Subsystem: Lenovo Device [17aa:3d60]

Notice that there is no kernel driver listed.

From your ubunu,

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00:15.0 Serial bus controller [0c80]: Intel Corporation Raptor Lake Serial IO I2C Host Controller #0 [8086:7a4c] (rev 11)
	Subsystem: Lenovo Device [17aa:3d60]
	Kernel driver in use: intel-lpss
	Kernel modules: intel_lpss_pci

Your gentoo kernel is missing at least one of those options.
They may hide other things that you need, like designware.

The kernel config is too big to read on my phone, I'll post more from a PC in a few hours.

[pietinger]

hc1997,

1. You need i2c for your touchpad ... and i2c needs pinctrl. For an Intel system this is one of these:

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# CONFIG_PINCTRL_BAYTRAIL is not set
# CONFIG_PINCTRL_CHERRYVIEW is not set
# CONFIG_PINCTRL_LYNXPOINT is not set
# CONFIG_PINCTRL_INTEL_PLATFORM is not set
# CONFIG_PINCTRL_ALDERLAKE is not set
# CONFIG_PINCTRL_BROXTON is not set
# CONFIG_PINCTRL_CANNONLAKE is not set
# CONFIG_PINCTRL_CEDARFORK is not set
# CONFIG_PINCTRL_DENVERTON is not set
# CONFIG_PINCTRL_ELKHARTLAKE is not set
# CONFIG_PINCTRL_EMMITSBURG is not set
# CONFIG_PINCTRL_GEMINILAKE is not set
# CONFIG_PINCTRL_ICELAKE is not set
# CONFIG_PINCTRL_JASPERLAKE is not set
# CONFIG_PINCTRL_LAKEFIELD is not set
# CONFIG_PINCTRL_LEWISBURG is not set
# CONFIG_PINCTRL_METEORLAKE is not set
# CONFIG_PINCTRL_METEORPOINT is not set
# CONFIG_PINCTRL_SUNRISEPOINT is not set
# CONFIG_PINCTRL_TIGERLAKE is not set

I guess you will need AlderLake (because you have a RaptorLake system) ... but you can find out very easy: Boot your Ubuntu and do a "lsmod" (Ubuntu have all of them enabled as <M>odule)

2. You need LPSS. The main module (CONFIG_X86_INTEL_LPSS) you have already enabled .... but you miss LPSS_ACPI and LPSS_PCI. LPC_SCH is usually only necessary in old XEON machines. You have this and should change all three:

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CONFIG_LPC_SCH=y
# CONFIG_MFD_INTEL_LPSS_ACPI is not set
# CONFIG_MFD_INTEL_LPSS_PCI is not set

3. You need only I801 and can disable the others:

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CONFIG_I2C_CCGX_UCSI=y
CONFIG_I2C_I801=y
CONFIG_I2C_ISCH=y
CONFIG_I2C_PIIX4=y

See also: https://wiki.gentoo.org/wiki/User:Pieti ... C_Touchpad