Elantech - 从 18.04 升级到 18.10 后触摸板不工作(ThinkPad L480)

Elantech - 从 18.04 升级到 18.10 后触摸板不工作(ThinkPad L480)

在 ThinkPad L480 上从 18.04 更新到 18.10 时,Elantech 触摸板停止工作。这意味着它根本无法识别。此问题在 18.10 首次启动后出现

dmesg | grep -i elantech显示以下错误:

[    3.409043] psmouse serio1: elantech: assuming hardware version 4 (with firmware version 0x5f3001)
[    3.427372] psmouse serio1: elantech: Synaptics capabilities query result 0x90, 0x18, 0x10.
[    3.447275] psmouse serio1: elantech: Elan sample query result 00, 23, c8
[    3.464905] psmouse serio1: elantech: Trying to set up SMBus access
[    5.576149] elan_i2c 0-0015: 0-0015 supply vcc not found, using dummy regulator
[    5.586505] elan_i2c 0-0015: failed to get resolution: -71
[    5.586527] elan_i2c: probe of 0-0015 failed with error -71

名称:

$ uname -a
Linux test 4.18.0-10-generic #11-Ubuntu SMP Thu Oct 11 15:13:55 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

我发现以下线程可以暂时解决问题(并在 Arch 中报告了同样的问题): https://bugs.archlinux.org/task/59714

运行以下命令为当前会话再次启用它:

sudo sh -c 'echo -n "elantech"> /sys/bus/serio/devices/serio1/protocol'

之后的 dmesg:

[  569.522490] psmouse serio1: elantech: assuming hardware version 4 (with firmware version 0x5f3001)
[  569.544584] psmouse serio1: elantech: Synaptics capabilities query result 0x90, 0x18, 0x10.
[  569.565939] psmouse serio1: elantech: Elan sample query result 00, 23, c8

运行修复之前:

$ cat /sys/bus/serio/devices/serio1/protocol
ETSMBus

之后:

$ cat /sys/bus/serio/devices/serio1/protocol
ETPS/2

当然,重启后必须再次运行该命令。

这是 4.18 内核的一个错误吗?

答案1

根据https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1803600 将内核参数添加psmouse.elantech_smbus=0到启动选项可以解决重启后的问题。

是的,这是 Linux 内核的一个错误。

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