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iaLPSS2_I2C and high CPU usage Intel(R) Serial IO I2C Host Controller - A0E9




I am facing issues from day one with this win11 laptop and its touchpad.


CPU consumming a square 10% of one core when the device is enabled, goes down below 1 % .

Fan always blowing air and laptop always warm. With a 11th Gen Intel(R) Core(TM) i7-1165G7  processor, this is a constant  waste that I find hard to live with.


The laptop vendor closed my ticket, "performs as designed" which in my view shows little respect for both designers and consumers.


When I disable the device "Intel(R) Serial IO I2C Host Controller - A0E9" from the device manager, I loose the touchpad function but CPU idle usage goes down to below 1 percent, fan stops and laptop gets cooler. 

I understand the driver for A0E9 is intel-serial-io-i2c-host-controller-a0e9, driver is up to date as per Intel Driver&support assistant, the laptop vendor's update program, and of course Windows update.


Please help me by providing me a way to use the touchpad without wasting resources. CPU is consuming ressources at an level I can not accept, being idle.

11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz, 2803 Mhz, 4 Core(s), 8 Logical Processor(s)



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3 Replies

CPU consumming a square 10% of one core when the device is enabled, goes down below 1 %  **when disabled**.

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Super User Retired Employee

Just my opinion, but this sounds like a problem with this touchpad's driver, not the i2c driver. Just because the i2c driver is used to support communications between the touchpad and its driver doesn't mean that it plays any role in this constant consumption - and if it did, there would be a lot more people here complaining about this kind of issue (whereas you are the first reporting an issue like this that I can remember and I am someone who is here looking at issues every day). The bottom line, I think you need to go back to the laptop manufacturer and complain about this touchpad driver.



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Thank you for your swift advice, I needed your view on it, so don't be sorry


System interrupt are high as soon as the device is enabled. Actually, this is an issue for years on a number of product lines, where the official 'fix' from support is .. to throttle down the CPU speed - hence fixing the fan noise - and reducing the electricity bill.


I am going back to them now , just as you recommend. Attached, the task manager screenshot, so you see why I am pursuing the issue .


Best regards , and thank you again


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