https://bugzilla.kernel.org/show_bug.cgi?id=32862
Summary: acer_wmi partially crashes ACPI/EC (Aspire 8930G)
Product: ACPI
Version: 2.5
Kernel Version: 2.6.38-gentoo-r1
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Other
AssignedTo: acpi_ot...@kernel-bugs.osdl.org
ReportedBy: hec...@marcansoft.com
Regression: Yes
laptop model: Acer Aspire 8930G
When the acer-wmi module is loaded, parts of ACPI go haywire. The immediate
symptom is that backlight control stops working, logging messages like the
following:
kernel: ACPI Error: Method parse/execution failed
[\_SB_.PCI0.PEGP.EVGA.LCD_._BCM] (Node ffff88013fc2b820), AE_AML_INFINITE_LOOP
(20110112/psparse-536)
kernel: ACPI Error: Evaluating _BCM failed (20110112/video-365)
ACPI: Failed to switch the brightness
I suspect it's waiting for some kind of state from the EC which never arrives.
Not loading acer_wmi solves the issue and brightness control works since that
uses the ACPI video driver anyway (however, this might have other negative
consequences regarding e.g. rfkill as others have mentioned before).
However, the issue is more severe than this. After shutting down and restarting
the computer, or rebooting, the machine hangs during POST with no video and no
backlight. This persists even if more reboots are attempted. The only way to
clear this state is to disconnect AC power, and remove the battery. This is why
I suspect the EC is hanging.
acer-wmi on 2.6.37-gentoo didn't have these issues.
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