Laptop touchpad powersaving headroom?
Posted: 2025-01-17 11:34
Dear Community,
powertop is reporting quite the powerdraw due to interrupts compared to idle when I touch the touch pad (XPS 13 9315 with an Intel 12th gen CPU). Is there headroom to save power on the touch pad without loosing (much) responsiveness?
Some speculation (with a noticeable lack of knowledge on my part):
I've seen that the IRQs for the touchpad and the controller have different core affinities. Could there be power saved by not waking two cores and maybe the ringbus?
Edit: After taking more of a look myself, apparently this is an at least somewhat wider concern:
https://bugzilla.kernel.org/show_bug.cgi?id=218169
powertop is reporting quite the powerdraw due to interrupts compared to idle when I touch the touch pad (XPS 13 9315 with an Intel 12th gen CPU). Is there headroom to save power on the touch pad without loosing (much) responsiveness?
Some speculation (with a noticeable lack of knowledge on my part):
I've seen that the IRQs for the touchpad and the controller have different core affinities. Could there be power saved by not waking two cores and maybe the ringbus?
Edit: After taking more of a look myself, apparently this is an at least somewhat wider concern:
https://bugzilla.kernel.org/show_bug.cgi?id=218169