Hi Jonathan,

On 8/9/24 5:35 PM, Jonathan Denose wrote:

Hello Hans and Dmitry,

Yes, as Dmitry described that's the issue that I was seeing but it was
on a Lenovo N24 and not an Ideapad Z570.

Ah ok, so the initial diagnosis that this was an issue with the
ideapad-laptop module turned out to not be true ?

And the a69ce592cbe0 ("Input: elantech - fix touchpad state on resume
for Lenovo N24") commit which Dmitry mentiones has resolved this,
correct ?

IOW no changes to the ideapad-laptop module are necessary ?

Regards,

Hans

On Mon, Aug 5, 2024 at 11:52 AM Dmitry Torokhov
[off-list ref] wrote:

quoted

Hi Hans,

On Mon, Aug 05, 2024 at 04:18:57PM +0200, Hans de Goede wrote:

quoted

Hi Dmitry,

On 3/7/24 7:29 PM, Dmitry Torokhov wrote:

quoted

On Mon, Mar 04, 2024 at 11:17:31AM -0600, Jonathan Denose wrote:

quoted

I disabled the ideapad driver by rebuilding the kernel without the
ideapad_laptop module. That does fix the suspend/resume issue!

Attached are the logs. Is there a way to make this permanent?

On Thu, Feb 29, 2024 at 12:23 PM Dmitry Torokhov
[off-list ref] wrote:

quoted

On Mon, Feb 12, 2024 at 02:57:08PM -0600, Jonathan Denose wrote:
...

quoted

[   50.241235] ideapad_acpi VPC2004:00: PM: calling acpi_subsys_resume+0x0/0x5d @ 4492, parent: PNP0C09:00
[   50.242055] snd_hda_intel 0000:00:0e.0: PM: pci_pm_resume+0x0/0xed returned 0 after 13511 usecs
[   50.242120] snd_hda_codec_realtek hdaudioC0D0: PM: calling hda_codec_pm_resume+0x0/0x19 [snd_hda_codec] @ 4518, parent: 0000:00:0e.0
[   50.247406] i8042: [49434] a8 -> i8042 (command)
[   50.247468] ideapad_acpi VPC2004:00: PM: acpi_subsys_resume+0x0/0x5d returned 0 after 6220 usecs

...

quoted

[   50.247883] i8042 kbd 00:01: PM: calling pnp_bus_resume+0x0/0x9d @ 4492, parent: pnp0
[   50.247894] i8042 kbd 00:01: PM: pnp_bus_resume+0x0/0x9d returned 0 after 0 usecs
[   50.247906] i8042 aux 00:02: PM: calling pnp_bus_resume+0x0/0x9d @ 4492, parent: pnp0
[   50.247916] i8042 aux 00:02: PM: pnp_bus_resume+0x0/0x9d returned 0 after 0 usecs

...

quoted

[   50.248301] i8042 i8042: PM: calling platform_pm_resume+0x0/0x41 @ 4492, parent: platform
[   50.248377] i8042: [49434] 55 <- i8042 (flush, kbd)
[   50.248407] i8042: [49435] aa -> i8042 (command)
[   50.248601] i8042: [49435] 00 <- i8042 (return)
[   50.248604] i8042: [49435] i8042 controller selftest: 0x0 != 0x55

So here I see the ideapad-laptop driver trying to access i8042 before it
even starts resuming. I wonder, does it help if you disable
(temporarily) the ideapad driver?

OK, so I tried to cook up a patch that would allow ideapad-laptop driver
to establish device link with i8042 so that the resume will be processed
after i8042 resumes, but the longer I think about it, the more I think
that ideapad driver should not be messing with the touchpad state
directly. The disable event may come up in a middle of the touchpad
resume transition, or when we decide to change touchpad mode for one
reason or another. It also does not respect inhibit/uninhibit controls
for input devices. I think that the proper way for ideapad driver to
handle this is to only send KEY_TOUCHPAD_OFF/KEY_TOUCHPAD_ON to
userspace and let userspace deal with toggling touchpad input (via
inhibit or by other means).

CC-ing ideapad maintainers for their thoughts.

Sorry for the very slow reply.

The interesting thing is that sometime ago I already removed the i8042_command()
command being done on most models now the ideapad driver already only
sends KEY_TOUCHPAD_OFF/KEY_TOUCHPAD_ON except on the ideapad Z570 for
which the i8042_command() call was initially added.

I agree that this should probably just be removed.

Jonathan, I presume that you are seeing this on an Ideapad Z570 ?
(since that is the only model where this is still done by default).

Since the i8042_command() call has already been disabled on all other
ideapad models I agree that it would be best to just remove it entirely
relying on userspace filtering out touchpad events after receiving
a KEY_TOUCHPAD_OFF.

I have submitted a patch to do just that:

https://lore.kernel.org/platform-driver-x86/20240805141608.170844-1-hdegoede@redhat.com/ (local)

Jonathan can you give this patch a try (with a kernel with
the ideapad-laptop module re-enabled) and then confirm that this
fixes things ?

IIRC Jonathan observed the touchpad being stuck on resume even after
disabling ideapad-laptop module. So we ended up with a69ce592cbe0
("Input: elantech - fix touchpad state on resume for Lenovo N24") that
sends disable and then enable command to the mouse/touchpad on resume
which makes touchpad work after resume.

Thanks.

--
Dmitry