Re: [PATCH 7.1 00/21] 7.1.2-rc1 review

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

On Fri, Jun 26, 2026 at 01:41:38PM -0700, Barry K. Nathan wrote:
> On 6/26/26 12:56 PM, Dmitry Torokhov wrote:
> > Hi Barry,
> > 
> > On Fri, Jun 26, 2026 at 10:56:21AM -0700, Barry K. Nathan wrote:
> > > (cc Dmitry Torokhov because this is related to two of your commits)
> > > 
> > > On 6/25/26 6:03 AM, Greg Kroah-Hartman wrote:
> > > > This is the start of the stable review cycle for the 7.1.2 release.
> > > > There are 21 patches in this series, all will be posted as a response
> > > > to this one.  If anyone has any issues with these being applied, please
> > > > let me know.
> > > > 
> > > > Responses should be made by Sat, 27 Jun 2026 12:54:50 +0000.
> > > > Anything received after that time might be too late.
> > > > 
> > > > The whole patch series can be found in one patch at:
> > > > 	https://www.kernel.org/pub/linux/kernel/v7.x/stable-review/patch-7.1.2-rc1.gz
> > > > or in the git tree and branch at:
> > > > 	git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-7.1.y
> > > > and the diffstat can be found below.
> > > > 
> > > > thanks,
> > > > 
> > > > greg k-h
> > > > 
> > > Unfortunately, 7.1.2-rc1 breaks the Synaptics touchpad on my Lenovo
> > > ThinkPad T14 Gen 1 -- the pointer no longer moves when I touch the
> > > touchpad. Potentially relevant line from dmesg:
> > > 
> > > rmi4_f01 rmi4-00.fn01: found RMI device, manufacturer: Synaptics, product: TM3471-020, fw id: 3972349
> > > 
> > > > Dmitry Torokhov<dmitry.torokhov@gmail.com>
> > > >       Input: rmi4 - refactor register descriptor parsing
> > > > 
> > > > Dmitry Torokhov<dmitry.torokhov@gmail.com>
> > > >       Input: rmi4 - fix register descriptor address calculation
> > > > > Both of these patches seem bad in my testing. Either one, individually,
> > > causes the pointer to no longer move when I touch the touchpad. If I
> > > revert both of them, then my touchpad works again.
> > > 
> > > I have not yet tested 7.0.14-rc1 or 6.18.37-rc1. However, the problem
> > > also reproduces on current mainline as of this writing (commit
> > > 51cb1aa1250c36269474b8b6ca6b6319e170f5a5).
> > 
> > Could you please try applying this debug patch and send me dmesg?
> 
> Sure, I applied the patch on top of mainline, and the dmesg output is
> below.

Thank you! So I messed up and "Input: rmi4 - fix register descriptor
address calculation" is totally wrong.

Can you please revert it (keeping the debug patch) and try booting again
and if the touchpad still does not work post the dmesg again.

Thanks!

-- 
Dmitry