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I've been very happy with Lenovo's conservation mode on my Yoga c940. But this time when I went to activate it I got the following error:

[kyle@leibniz ~]$ sudoedit /sys/bus/platform/drivers/ideapad_acpi/VPC2004\:00/conservation_mode 
sudoedit: unable to write to /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode: Input/output error
sudoedit: contents of edit session left in /var/tmp/conservation_mode.XX0nhtvi

I am on Manjaro, following the instructions available on the ArchWiki.

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Looks like it's not working on 5.12, I have same problem with my Lenovo 14IIL05. I'm on arch and I installed linux-lts (which is 5.10 currently) and it works on that one all right.

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I had same problem on Lenovo G580 linux 5.12.2 openSUSE tumbleweed

Also, I found another solution on Arch wiki via acpi calls. But it didnt work for me too Error: AE_NOT_FOUND

So, I booted into ubuntu 20.10 with 5.8.0 kernel and successfully writen 0 to /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode

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  • So you're saying you booted with a different OS and were able to write to the file from there? Did that make it so you could edit the file again in Tumbleweed? – Kyle May 19 at 3:34
  • I'ts not like it is a real file, its just how linux presents this features. It seams to be broken in kernel 5.12, for me it works on 5.10 (archlinux lts kernel) – pbogut May 21 at 12:30

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