http://bugzilla.kernel.org/show_bug.cgi?id=13745
Summary: HP G7000 battery disappears after suspend
Product: ACPI
Version: 2.5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Sleep-Wake
AssignedTo: acpi_power-sleep-wake@...
ReportedBy: alan-jenkins@...
Regression: Yes
I've borrowed this laptop for a few days. Linux works pretty well, but I found
a problem on newer kernels. After suspend it claims the battery has been
removed. E.g. /proc/acpi/battery/BAT0/state claims the battery is not present
(but it is).
I bisected it to the commit below. Manually reverting the patch fixes the
problem (in both 2.6.30 and 2.6.31-rc2).
commit d0c71fe7ebc180f1b7bc7da1d39a07fc19eec768
Author: Rafael J. Wysocki <rjw@...>
Date: Sat Oct 4 00:05:05 2008 +0200
ACPI Suspend: Enable ACPI during resume if SCI_EN is not set
On some machines, like for example MSI Wind U100, the BIOS doesn't
enable ACPI before returning control to the OS, which sometimes
causes resume to fail. This is against the ACPI specification,
which clearly states that "When the platform is waking from an S1, S2
or S3 state, OSPM assumes the hardware is already in the ACPI mode
and will not issue an ACPI_ENABLE", but it won't hurt to check the
SCI_EN bit and enable ACPI during resume from S3 if this bit is not
set.
Fortunately, we already have acpi_enable() for that, so use it in the
resume code path, before executing _BFS, in analogy with the
resume-from-hibernation code path.
NOTE: We aren't supposed to set SCI_EN directly, because it's owned
by the hardware.
Signed-off-by: Rafael J. Wysocki <rjw@...>
Pavel Machek <pavel@...>
Signed-off-by: Len Brown <len.brown@...>
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