linux-kernel - Re: Regression: SYNA3602 I2C touchpad broken in Linux 6.17.7 (works in 6.17.6 and previous versions)

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Message-ID: <2c8d4baa-679f-4af7-a78d-41774410e9a6@leemhuis.info>
Date: Mon, 8 Dec 2025 14:54:20 +0100
From: Thorsten Leemhuis <regressions@...mhuis.info>
To: Vijay <vijayg0127@...il.com>
Cc: regressions@...ts.linux.dev, linux-kernel@...r.kernel.org,
 linux-input@...r.kernel.org, linux-pm@...r.kernel.org,
 linux-acpi@...r.kernel.org,
 Benjamin Tissoires <benjamin.tissoires@...hat.com>, jikos@...nel.org
Subject: Re: Regression: SYNA3602 I2C touchpad broken in Linux 6.17.7 (works
 in 6.17.6 and previous versions)

On 12/8/25 13:13, Vijay wrote:
> 
> Yes, the touchpad is not working in 6.18 also, getting the same errors
> as mentioned previously, 

That's really good to know, thx!

Thing is: I fear that nobody will look into this, unless you or somebody
else affected checks which change broke things. Benjamin mentioned three
you could try reverting in 6.17.y; alternatively, perform a bisection in
6.17.y. For details, see:
https://docs.kernel.org/admin-guide/verify-bugs-and-bisect-regressions.html

Ciao, Thorsten


> On Thu, 4 Dec 2025 at 20:40, Thorsten Leemhuis
> <regressions@...mhuis.info <mailto:regressions@...mhuis.info>> wrote:
> 
>     Lo!
> 
>     @AM Vijay: 6.17.y will be EOL in about ten days, so this is unlikely to
>     get fixed there. The big question is:
> 
>     Is 6.18 affected?
> 
>     If it is, we need your help identifying want went wrong; if not, then
>     it's likely not worth looking closer into this
> 
>     Ciao, Thorsten
> 
>     On 11/28/25 09:05, Benjamin Tissoires wrote:
>     > Hi,
>     >
>     > On Fri, Nov 28, 2025 at 7:40 AM Vijay <vijayg0127@...il.com
>     <mailto:vijayg0127@...il.com>> wrote:
>     >>
>     >> Hello,
>     >>
>     >> I would like to report a regression in the Linux kernel affecting
>     I2C-HID
>     >> touchpads that run through the Intel ISH + DesignWare I2C controller.
>     >>
>     >> Hardware:
>     >> - Laptop: Infinix Y4 Max
>     >> - CPU: Intel (13th gen core i5)
>     >> - Touchpad: SYNA3602:00 093A:35ED (I2C HID)
>     >> - Bus path: SYNA3602 → i2c_designware → Intel ISH → HID
>     >> - OS: Linux (Arch/CachyOS)
>     >> - Kernel config: Default distro config
>     >>
>     >> Regression summary:
>     >> - Touchpad works perfectly in Linux 6.17.6 and below versions
>     >> - Touchpad stops working in Linux 6.17.7 and all newer versions
>     (6.17.8, 6.17.9, etc.)
>     >> - Desktop environment does not matter (Hyprland/GNOME both fail)
>     >> - The failure happens before userspace loads
>     >> - Touchpad also works fine in Linux 6.12 LTS
>     >>
>     >> This is a kernel-level regression introduced between:
>     >>     Good: Linux 6.17.6
>     >>     Bad:  Linux 6.17.7
>     >>
>     >> **Dmesg logs from broken kernel (6.17.7 and newer):**
>     >>
>     >>     i2c-SYNA3602:00: can't add hid device: -110
>     >>     hid_sensor_hub: reading report descriptor failed
>     >>     intel-hid INTC1078:00: failed to enable HID power button
>     >
>     > Looks like i2c-hid can't even communicate with any I2C device, so this
>     > is slightly worrying.
>     >
>     >>
>     >> And the DesignWare I2C controller logs around the failure:
>     >>     i2c_designware 0000:00:15.0: controller timed out
>     >>     i2c_designware 0000:00:15.0: lost arbitration
>     >>     i2c_designware 0000:00:15.0: transfer aborted (status = -110)
>     >>
>     >> These errors appear only on 6.17.7+ and not on 6.17.6.
>     >>
>     >> On working versions (6.17.6 and 6.12 LTS), the touchpad
>     initializes normally:
>     >>
>     >>     input: SYNA3602:00 093A:35ED Touchpad as /devices/.../input/
>     inputX
>     >>     hid-multitouch: I2C HID v1.00 device initialized
>     >>     i2c_designware 0000:00:15.0: controller operating normally
>     >>
>     >> This narrow regression window should make it possible to identify
>     the offending
>     >> change in either:
>     >> - HID core
>     >> - I2C-HID
>     >> - Intel ISH HID
>     >> - DesignWare I2C controller
>     >> - ACPI timing changes
>     >>
>     >> I can provide:
>     >> - Full dmesg (working and broken)
>     >> - acpidump
>     >
>     > Are you running on a full vanilla kernel?
>     >
>     > The changelog between 6.17.6 and 6.17.7 is rather small, so it should
>     > be easy enough to bisect and get the offending commit.
>     >
>     > I have my suspicions on:
>     > f1971d5ba2ef ("genirq/manage: Add buslock back in to enable_irq()")
>     > b990b4c6ea6b ("genirq/manage: Add buslock back in to
>     __disable_irq_nosync()")
>     > 3c97437239df ("genirq/chip: Add buslock back in to irq_set_handler()")
>     >
>     > Because anything else is unrelated to any component involved in
>     i2c-hid.
>     > (But that's also assuming you are running vanilla kernels without any
>     > extra patches.)
>     >
>     > OTOH, I've booted a 6.17.8 and 6.17.7 shipped by Fedora and I don't
>     > see any issues related to i2c-hid, so those 3 commits might not be the
>     > culprits.
>     >
>     >
>     >>
>     >> Please let me know what additional data is needed.
>     >
>     > Can you do a bisect between v6.17.7 and v6.17.6?
>     >
>     > Cheers,
>     > Benjamin
>     >
>     >>
>     >> Thank you,
>     >> Vijay.
>     >
>     >
>     >
>