https://bugzilla.kernel.org/show_bug.cgi?id=45151
Summary: [REGRESSION] [BISECTED] ACPI event stop to be detected
Product: ACPI
Version: 2.5
Kernel Version: 2.6.39
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ACPICA-Core
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: Yes
This report follow ubuntu bug from here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/908825
This is the resume of the launchpad report and the suspected problem:
I've a Clevo M720 notebook rebranded as Santech T45. All kernel from 2.6.38
and before support my laptop hotkey without extra set up. From 2.6.39 and
following acpi support is broken. For example, with newer kernel, there are not
recognized event like:
- the ac_adapter plug and unplug
- changing battery charging/discharging status event
- suspend button*
- backlight hotkey event*
- low power mode button*
- lid open/close
The bug is reproducible booting the laptop with a kernel from 2.6.38 and older
and affect all most diffused distribution (debian, fedora, ubuntu, etc.) when
using newer kernel. Using acpi_event command I've saved the output for low
power mode button, backlight up and down and suspend button:
#: acpi_listen
processor CPU0 00000080 00000003
processor CPU0 00000081 00000000
processor CPU1 00000080 00000003
processor CPU1 00000081 00000000
processor CPU0 00000080 00000000
processor CPU0 00000081 00000000
processor CPU1 00000080 00000000
processor CPU1 00000081 00000000
video LCD 00000087 00000000
video LCD 00000086 00000000
button/sleep SLPB 00000080 00000002
After kernel bisection, I've found the first commit that have caused the
regression:
6dfad339645247c9deb553e4d68e21211ddc61bd is the first bad commit
commit 6dfad339645247c9deb553e4d68e21211ddc61bd
Author: Lin Ming <email address hidden>
Date: Mon Feb 14 15:29:34 2011 +0800
ACPICA: GPE detect optimization - ignore unused GPE registers
This optimization will simply ignore GPE registers that contain
no enabled GPEs - there is no need to read the register.
ACPICA bugzilla 884.
http://www.acpica.org/bugzilla/show_bug.cgi?id=884
Signed-off-by: Lin Ming <email address hidden>
Signed-off-by: Bob Moore <email address hidden>
Signed-off-by: Len Brown <email address hidden>
:040000 040000 8c25abddf22c9740402624bd582f3c87bfe9fc4f
e40ed2fa28b82990cc8fb147f61841fd6400e711 M drivers
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