Re: Synaptics RMI4 touchpad regression in 4.11-rc1

From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
To: Thorsten Leemhuis <linux@leemhuis.info>
Cc: Cameron Gutman <aicommander@gmail.com>,
	aduggan@synaptics.com, nick@shmanahar.org, cheiny@synaptics.com,
	linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Synaptics RMI4 touchpad regression in 4.11-rc1
Date: Mon, 13 Mar 2017 14:13:56 +0100	[thread overview]
Message-ID: <20170313131356.GH4378@mail.corp.redhat.com> (raw)
In-Reply-To: <7964888d-05dd-b109-973a-e0503884e2e2@leemhuis.info>

On Mar 13 2017 or thereabouts, Thorsten Leemhuis wrote:
> Lo! On 12.03.2017 02:55, Cameron Gutman wrote:
> >
> > Beginning in 4.11-rc1, it looks like RMI4 is binding to my XPS 13 9343's
> > Synaptics touchpad and dropping some errors into dmesg. Here are the
> > messages that seem RMI-related:
> > 
> > rmi4_f34 rmi4-00.fn34: rmi_f34v7_probe: Unrecognized bootloader version
> > rmi4_f34: probe of rmi4-00.fn34 failed with error -22
> > rmi4_f01 rmi4-00.fn01: found RMI device, manufacturer: Synaptics, product: TM3038-001, fw id: 1832324
> > input: Synaptics TM3038-001 as /devices/pci0000:00/INT3433:00/i2c-7/i2c-DLL0665:01/0018:06CB:76AD.0001/input/input19
> > hid-rmi 0018:06CB:76AD.0001: input,hidraw0: I2C HID v1.00 Mouse [DLL0665:01 06CB:76AD] on i2c-DLL0665:01
> 
> FWIW, I get this on my XPS 13 DE (9360) with 4.11-rc1:
> 
> input: SynPS/2 Synaptics TouchPad as
> /devices/platform/i8042/serio1/input/input6
> rmi4_f34 rmi4-00.fn34: rmi_f34v7_probe: Unrecognized bootloader version
> rmi4_f34: probe of rmi4-00.fn34 failed with error -22
> rmi4_f01 rmi4-00.fn01: found RMI device, manufacturer: Synaptics,
> product: TM3038-003, fw id: 2375007
> input: Synaptics TM3038-003 as
> /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-8/i2c-DLL075B:01/0018:06CB:76AF.0001/input/input20
> hid-rmi 0018:06CB:76AF.0001: input,hidraw0: I2C HID v1.00 Mouse
> [DLL075B:01 06CB:76AF] on i2c-DLL075B:01
> 
> > […] 
> > Compared to hid-multitouch, the RMI stack seems to have completely broken
> > palm rejection and introduced some random jumpiness during fine pointing
> > motions. I don't know if these issues are caused by the above errors or
> > are a separate issue.
> 
> Just to confirm: I noticed "jumpiness during fine pointing motions" as
> well since switching to 4.11-rc.

Thanks both of you for the reports.
Andrew, Jiri, I think switching everybody to rmi4-core was maybe not the
best move. Could we add a module parameter somewhere to force switching
back to hid-multitouch? (Or the other way around more likely).

We might need to have users testing rmi4-core and report libinput bugs,
but introducing such regressions for everybody is IMO not the right way.

Note that I do not see any differences besides bug fixes when switching
from PS/2 to RMI4-core on my Lenovo T450s, so maybe the hid-multitouch
capable firmware does some more filtering (the Lenovos are not using HID
for the touchpads).

> 
> @benjamin: Just wondering: Could that have something to do with the
> ps2->rmi handover? I noticed that patches to improve things in this area
> are still circulating, which lead me to wonder if that might have
> anything to do with this. But it's just a wild guess.

This has nothing to do. ps2->rmi is not used at all by hid-rmi as the
enumeration is done in the ACPI. The series you are mentioning are for
touchpads that do not enumerate. Once enumerated (either through PS/2 or
HID), the code should be the same.

Cheers,
Benjamin

> 
> > The affected machine is an XPS 13 9343 running Fedora 25 with 4.11-rc1 
> > and libinput 1.6.3-3.fc25 (latest in F25).
> 
> Same setup here. In case it matters: I'm running Gnome-Shell in Wayland
> mode.
> 
> Ciao, Thorsten
> 
> P.S.: I fixed the model number in above quotes from Cameron to avoid
> confusion (he has a 9343, and not a 9443, as initially stated; see a
> different mail in this thread for details)