Bug 213109 - ideapad-laptop: Regression in 5.12.x for Battery conservation mode
Summary: ideapad-laptop: Regression in 5.12.x for Battery conservation mode
Alias: None
Product: Drivers
Classification: Unclassified
Component: Platform_x86 (show other bugs)
Hardware: x86-64 Linux
: P1 normal
Assignee: drivers_platform_x86@kernel-bugs.osdl.org
Depends on:
Reported: 2021-05-17 16:05 UTC by Fouad
Modified: 2021-05-19 13:46 UTC (History)
2 users (show)

See Also:
Kernel Version: 5.12.4
Tree: Mainline
Regression: Yes


Description Fouad 2021-05-17 16:05:01 UTC
Enabling battery conservation mode no longer works on Linux 5.12.x for Lenovo Legion 5 15ARH05.

It works with kernel versions 5.11 and 5.10 on Arch Linux.

Modifying `/sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode` fails with message : `Input/output error`
Comment 1 Barnabás Pőcze 2021-05-17 16:21:59 UTC
Thanks for bringing this up. The issue has already been reported in https://bugzilla.kernel.org/show_bug.cgi?id=212985 and a patch has been sent to fix it ( https://lore.kernel.org/platform-driver-x86/20210507235333.286505-1-pobrn@protonmail.com/ ).
Comment 2 Hans de Goede 2021-05-19 13:46:35 UTC
I've added the patch fixing this to the fixes branch of the pdx86 kernel tree:

The contents of this branch will be in the next pdx86-fixes pull-req which I send to Linus for 5.13. Since the patch has a fixes tag it will get added automatically to the 5.12 kernels once Linus has merged it, so this bug can be closed now.

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