http://bugzilla.kernel.org/show_bug.cgi?id=11930
Summary: Battery not detected when EC switches to poll mode
Product: ACPI
Version: 2.5
KernelVersion: 2.6.27-r2
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Battery
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Latest working kernel version: < 2.6.26
Earliest failing kernel version: 2.6.26
Distribution: Gentoo
Hardware Environment: Benq S41 notebook with Core2Duo T7100 and Nvidia GM 8600
Software Environment: Gentoo ~X86
Problem Description:
After upgrade to gentoo-sources-2.6.27-r2, which corresponds to vanilla kernel
2.6.27.4, my battery can no longer be detected.
There do exists a /proc/acpi/battery/BAT1 entry, but when I issue the command
"cat info", it says no, so does the "cat state" command. Obviously, my battery
is not detected by the new kernel.
I remember it is working correctly with tuxonice-sources-2.6.25-r7 which
corresponding to vanilla kernel 2.6.25.11.
Thanks to dmesg, i could see the difference between the two kernels, and found
that :
1. in tuxonice-2.6.25-r7, it says
[quote]
ACPI: EC: Look up EC in DSDT
ACPI: BIOS _OSI(Linux) query ignored via DMI
ACPI: Interpreter enabled
ACPI: (supports S0 S3 S4 S5)
ACPI: Using IOAPIC for interrupt routing
ACPI: EC: GPE = 0x17, I/O: command/status = 0x66, data = 0x62
ACPI: EC: driver started in poll mode
....
ACPI: EC: non-query interrupt received, switching to interrupt mode
[/quote]
2. in 2.6.27-r2, it says
[quote]
ACPI: Using IOAPIC for interrupt routing
ACPI: EC: GPE storm detected, disabling EC GPE
ACPI: EC: GPE = 0x17, I/O: command/status = 0x66, data = 0x62
ACPI: EC: driver started in poll mode
[/quote]
Comparing the two, I suspect the problems lies that the new kernel makes my
computer started in poll mode while the old kernel makes my computer started in
interrupt mode, and my computer works in interrupt mode.
So I make an experiment: i copyed acpi/drivers/ec.c from
tuxoince-sources-2.6.25-r7 and replace the same file in 2.6.27-r2, recompiled
the kernel and boot， this time using 2.6.27-r2 kernel with ec.c borrowed from
2.6.25-r7, my battery is back.
So i am wondering if you could patch the ec.c in 2.6.27-r2 a little so that it
could work with my computer. Thank you very much.
Below is a list of related debug information.
Steps to reproduce:
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