On Mon, Jul 17, 2023 at 2:59 PM Jonathan Denose <jdenose@xxxxxxxxxxxx> wrote:
>
> Hello,
>
> I am on a Lenovo N24 laptop.
>
> When this device resumes after closing the lid, the mouse freezes and
> is unusable. After right-clicking multiple times the touchpad resumes
> working. I am seeing the following in the logs:
>
> [ 1188.690138] psmouse serio1: Touchpad at isa0060/serio1/input0 lost
> sync at byte 6
> [ 1188.699636] psmouse serio1: Touchpad at isa0060/serio1/input0 lost
> sync at byte 6
> [ 1188.709124] psmouse serio1: Touchpad at isa0060/serio1/input0 lost
> sync at byte 6
> [ 1188.718557] psmouse serio1: Touchpad at isa0060/serio1/input0 lost
> sync at byte 6
> [ 1188.728110] psmouse serio1: Touchpad at isa0060/serio1/input0 lost
> sync at byte 6
> [ 1188.975964] psmouse serio1: Touchpad at isa0060/serio1/input0 lost
> sync at byte 6
> [ 1188.985456] psmouse serio1: Touchpad at isa0060/serio1/input0 lost
> sync at byte 6
> [ 1188.994954] psmouse serio1: Touchpad at isa0060/serio1/input0 lost
> sync at byte 6
> [ 1189.004443] psmouse serio1: Touchpad at isa0060/serio1/input0 lost
> sync at byte 6
> [ 1189.013930] psmouse serio1: Touchpad at isa0060/serio1/input0 lost
> sync at byte 6
>
> This device has an ETPS/2 Elantech Touchpad. I am on kernel version:
> 5.15.117-19629-gf1eb3139d206.
>
> Greg KH suggested that I try later kernel versions, and I've tried 6.4
> and 6.1 and the issue is present on both of those versions. This issue
> is also present on 5.10.
>
> Currently the device suspends to ram when the lid closes. When the
> device idles without the lid closing, the touchpad works fine on
> resume.
>
> I have tried adding various i8042 and psmouse kernel parameters from
> searching different forums related to these error messages, but none
> of them fix the issue. I have tried
> - psmouse.resetafter=0
> - psmouse.resetafter=1
> - i8042.nomux=1
> - i8042.resetafter=1/0
> - i8042.reset=1 i8042.nomux=1
> - i8042.noloop=1 i8042.nopnp=1 i8042.nomux=1 i8042.reset=1
>
> I was able to resolve this issue by doing `modprobe -r psmouse &&
> modprobe.psmouse proto=imps`. proto=bare and proto=exps also resolve
> the issue. However, with those options enabled I can no longer use
> gestures like two-finger scroll.
>
> This issue reproduces on ChromeOS Flex and Ubuntu 22.04 but not on
> Windows. On Windows the touchpad resuming after closing the lid works
> fine.
>
> What can I do to resolve this issue while also keeping touchpad gestures?
>
> Any help is greatly appreciated!
Hello,
As an update, this error is getting thrown from case 4 in elantech_process_byte:
```
static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
{
...
case 4:
packet_type = elantech_packet_check_v4(psmouse);
switch (packet_type) {
case PACKET_UNKNOWN:
return PSMOUSE_BAD_DATA;
case PACKET_TRACKPOINT:
elantech_report_trackpoint(psmouse, packet_type);
break;
default:
elantech_report_absolute_v4(psmouse, packet_type);
break;
}
break;
}
return PSMOUSE_FULL_PACKET;
}
```
The issue is fixed by running `rmmod psmouse && modprobe psmouse` but
I haven't found a good way to replicate that in code for the failure
case.
