https://bugzilla.kernel.org/show_bug.cgi?id=100421
Bug ID: 100421
Summary: Huge delay when pressing Fn keys and (un)plugging
power on a Lenovo U530 Laptop
Product: ACPI
Version: 2.5
Kernel Version: v4.0+
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: EC
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 180741
--> https://bugzilla.kernel.org/attachment.cgi?id=180741&action=edit
dmesg with first bad commit
I reported this bug several weeks ago, but I think in the wrong section and
without much information.
https://bugzilla.kernel.org/show_bug.cgi?id=99291
The problem is that since linux 4.0 the recognition of the power supply state
has a huge delay (seconds up to minutes) on a Lenovo U530 Laptop.
cat /sys/class/power_supply/BAT1/status hangs and won't print any output after
I plug or unplug the power.
Also some Fn keys are hit by this delay (Brightness and Monitor off).
This issue was not present before.
Nevertheless I bisected the issue to
commit 74443bbed72ab22ee005ecb6ecdc657a8018e1db
Author: Lv Zheng <[email protected]>
Date: Wed Jan 14 19:28:47 2015 +0800
I also tried to boot with a lot of combinations of "acpi_osi", but nothing
helped.
So linux is almost not usable for me since version 4.0.
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