https://bugzilla.kernel.org/show_bug.cgi?id=42870
Summary: acpi_processor fails to recognize C4 after
NOTIFY_POWER
Product: ACPI
Version: 2.5
Kernel Version: 3.2.9
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Processor
AssignedTo: acpi_power-proces...@kernel-bugs.osdl.org
ReportedBy: g...@stapelspeicher.org
Regression: No
Created an attachment (id=72542)
--> (https://bugzilla.kernel.org/attachment.cgi?id=72542)
dmesg with attached /proc/cpuinfo
I observed that acpi_idle won't utilize the C4-state after unplugging the
laptop from power. However, after sending it into standby, it will be able to
use it properly.
Maybe the state-data is not properly initialized by the processor, as it
doesn't seem to fiddle with (only reads) the data after the notification
ACPI_PROCESSOR_NOTIFY_POWER has been received. (But I have not expertise here,
I have no idea where to look further.)
Still, linux recognizes that there is another state, but cannot make use of it.
Some information from /sys/devices/system/cpu/cpu0/cpuidle/state4/*:
Before unplugging, there is no "state4".
after unplugging:
desc: <null>
latency: 185
name: <null>
power: 0
after standby while unplugged (or booted up while unplugged):
desc: ACPI IOPORT 0x1016
latency: 185
name: C4
power: 0
I am using a IBM Thinkpad T43 (2669Y3N) with a Pentium-M (Donthan 740) running
a vanilla kernel 3.2.9, I attached /proc/cpuinfo and a dmesg.
Please let me know what else information I could supply or try out.
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