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Old 02-11-2019, 07:12 AM   #1
Cesare
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touchpad dead with kernel 4.4.172


With kernel 4.4.172 the Elan touchpad in my Acer notebook goes dead. It's still detected but doesn't react to touching or pressing the buttons. After downgrading to 4.4.157 everything is working again.

Anybody else suffering from the same problem? Have you already invested the time in figuring out which kernel version broke it and how to fix it?
 
Old 02-11-2019, 09:15 PM   #2
Ztcoracat
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I don't think the kernel broke it.

What most likely happened is that kernel 4.4.172 doesn't yet support that touchpad.

No, I haven't invested time to fix it as I don't have an Acer:- Sorry.
 
Old 02-11-2019, 09:17 PM   #3
willysr
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did you use generic kernel and forget to rebuild initrd?
 
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Old 02-15-2019, 07:42 PM   #4
Cesare
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@Ztcoracat: Did you even read the question?

@willysr: Nope, installing a new kernel, generating the initrd and updating the boot loader is scripted. AFAIK forgetting to update the initrd renders the generic kernel unbootable.

This seems to be a regression in the i2c drivers of more recent kernels, affecting some Acer laptops with Elan touchpads, possibly others.

Luckily there's a simple workaround, at least for some laptops: change the touchpad setting in the BIOS from "advanced" to "generic". This will make the touchpad appear as a PS/2- rather than a i2c input device and thus make the touchpad work again in kernels newer than 4.4.157.
 
  


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