神船 TX6 修复 ArchLinux 下触摸板问题

Part 1 背景

在 Arch Linux 刚刚安装好时，这台神船 TX6（蓝天 NK60SB 模具）的触摸板是正常的。然而，2021 年 2 月 26 日系统更新之后的重启改变了这一切——触摸板不能用了。我按照 wiki 上的各种方法，安装了 xf86-input-synaptics，调整了 /etc/X11/xorg.conf.d/70-synaptics.conf、/usr/share/X11/xorg.conf.d/70-synaptics.conf等配置文件 ，查了 journalctl、/var/log/Xorg.0.log 等各种日志，追踪了 /proc/bus/input/devices等，甚至安装了 GNOME、切换 wayland，无果。求助了一些大佬，仍然没有解决问题。由于当时更新了 nvidia 驱动，切换 nvidia 驱动仍然无果。后来，尝试禁用独显，仍然没用，说明可能不是 nvidia 的原因……

Part 2 解决

事发 6 个月后，通过在 Bing 上搜索 “dev/input/mouse touchpad” ，成功找到 archlinux 的 bbs，在 /etc/default/grub 中 GRUB_CMDLINE_LINUX_DEFAULT 条目加入 pci=nocrs，之后执行sudo grub-mkconfig -o /boot/grub/grub.cfg（根据自己 grub 安装情况调整，这里我在 /etc/default/grub 里加入了 GRUB_DISABLE_OS_PROBER=false 来检测到 Windows），重启，触摸板可以用了，并且执行 sudo dmesg | grep i2c 可以看到这样的输出：

[    3.028457] input: ELAN0413:00 04F3:3161 Mouse as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-0/i2c-ELAN0413:00/0018:04F3:3161.0001/input/input11
[    3.028517] input: ELAN0413:00 04F3:3161 Touchpad as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-0/i2c-ELAN0413:00/0018:04F3:3161.0001/input/input13
[    3.028561] hid-generic 0018:04F3:3161.0001: input,hidraw0: I2C HID v1.00 Mouse [ELAN0413:00 04F3:3161] on i2c-ELAN0413:00
[    3.033612] i2c i2c-2: 2/2 memory slots populated (from DMI)
[    3.034104] i2c i2c-2: Successfully instantiated SPD at 0x50
[    3.504030] input: ELAN0413:00 04F3:3161 Mouse as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-0/i2c-ELAN0413:00/0018:04F3:3161.0001/input/input18
[    3.504075] input: ELAN0413:00 04F3:3161 Touchpad as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-0/i2c-ELAN0413:00/0018:04F3:3161.0001/input/input20
[    3.504118] hid-multitouch 0018:04F3:3161.0001: input,hidraw0: I2C HID v1.00 Mouse [ELAN0413:00 04F3:3161] on i2c-ELAN0413:00

Part 3 更新

在 2024 年 1 月 24 日（Arch Linux 内核版本 6.6.10-arch1-1）时，不使用 pci=nocrs，也可以正常使用触控板了。此时 sudo dmesg | grep i2c 输出如下：

[    2.345878] i2c_dev: i2c /dev entries driver
[    3.138225] i2c i2c-7: 2/2 memory slots populated (from DMI)
[    3.141268] i2c i2c-7: Successfully instantiated SPD at 0x50
[    3.164540] input: ELAN0413:00 04F3:3161 Mouse as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-5/i2c-ELAN0413:00/0018:04F3:3161.0001/input/input46
[    3.164666] input: ELAN0413:00 04F3:3161 Touchpad as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-5/i2c-ELAN0413:00/0018:04F3:3161.0001/input/input48
[    3.164780] hid-generic 0018:04F3:3161.0001: input,hidraw0: I2C HID v1.00 Mouse [ELAN0413:00 04F3:3161] on i2c-ELAN0413:00
[    3.427124] input: ELAN0413:00 04F3:3161 Mouse as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-5/i2c-ELAN0413:00/0018:04F3:3161.0001/input/input50
[    3.427176] input: ELAN0413:00 04F3:3161 Touchpad as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-5/i2c-ELAN0413:00/0018:04F3:3161.0001/input/input52
[    3.427221] hid-multitouch 0018:04F3:3161.0001: input,hidraw0: I2C HID v1.00 Mouse [ELAN0413:00 04F3:3161] on i2c-ELAN0413:00

当然，由于更新过 BIOS，也可能与这些因素有关。