Re: [REGRESSION][BISECTED] Lenovo IdeaPad touchpad does not work when idma64 is present in initramfs

[Mika Westerberg <mika.westerberg@linux.intel.com>]

On Tue, Jan 27, 2026 at 01:52:01AM -0500, correctmost wrote:
> On Mon, Jan 26, 2026, at 8:53 AM, Mika Westerberg wrote:
> > On Sat, Jan 24, 2026 at 10:38:14PM -0500, correctmost wrote:
> >> I am seeing mixed results with those i2c config changes, depending on which modules are included in the initramfs image.
> >> 
> >> Build info for both tests:
> >> - Commit c072629f05d7
> >> - CONFIG_I2C_DESIGNWARE_CORE=m
> >> - CONFIG_I2C_DESIGNWARE_PLATFORM=m
> >> 
> >> --> Test 1 - Various i2c modules absent from initramfs
> >> 
> >> Modules:
> >> - drivers/dma/idma64.ko.zst present in initramfs
> >> - drivers/hid/i2c-hid/{i2c-hid-acpi.ko.zst,i2c-hid.ko.zst} absent from initramfs
> >> - drivers/i2c/busses/{i2c-designware-core.ko.zst,i2c-designware-platform.ko.zst,i2c-i801.ko.zst} absent from initramfs
> >> - drivers/i2c/{i2c-mux.ko.zst,i2c-smbus.ko.zst} absent from initramfs
> >> 
> >> Result: The touchpad works, but there are still IRQ #27 messages:
> >
> > And the touchpad is working fine after boot too?
> 
> Yep, the touchpad seems to work fine in my desktop environment after booting and logging in.

Can you do one more experiment?

Add "modprobe.blacklist=idma64" in the command line too (keep everything
else as they are now). Does the touchpad still work and do you still get
the warning? Please share full dmesg.