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

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

[Benjamin Tissoires]

Hi,

On Fri, Nov 28, 2025 at 7:40 AM Vijay <vijayg0127@gmail.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.

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

[Thorsten Leemhuis]

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@gmail.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.
> 
> 
> 

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

[Thorsten Leemhuis]

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@leemhuis.info <mailto:regressions@leemhuis.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@gmail.com
>     <mailto:vijayg0127@gmail.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.
>     >
>     >
>     >
>