how to debug a kernel that does not power off?

how to debug a kernel that does not power off?

[Ákos Maróy]

Hi,

This might be a lame question, but: how would I debug a kernel that
simply does not power off a machine? When powering off, on the console I
get to the message: [...] Poweroff.

but then, the machine actually does not power off. This is an HP Envy 15
laptop using an intel i7 CPU, and kernel 2.6.32.8..10.

I tried to read up on all sorts of documentation, but could not get more
debug info out of the kernel :(

any pointers would be welcome..


Akos

Re: how to debug a kernel that does not power off?

[Alexey Starikovskiy]

Hi,

Most probably, you have ACPI disabled either in the BIOS or in the
kernel (command line or compiled out). Please check if it is enabled.

Regards,
Alex.

Ákos Maróy пишет:
> Hi,
>
> This might be a lame question, but: how would I debug a kernel that
> simply does not power off a machine? When powering off, on the console I
> get to the message: [...] Poweroff.
>
> but then, the machine actually does not power off. This is an HP Envy 15
> laptop using an intel i7 CPU, and kernel 2.6.32.8..10.
>
> I tried to read up on all sorts of documentation, but could not get more
> debug info out of the kernel :(
>
> any pointers would be welcome..
>
>
> Akos
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
> the body of a message to majordomo@vger.kernel.org
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>   

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Re: how to debug a kernel that does not power off?

[Ákos Maróy]

Alexey,

> Most probably, you have ACPI disabled either in the BIOS or in the
> kernel (command line or compiled out). Please check if it is enabled.

I seem to have ACPI enabled in the kernel:

# grep ACPI /boot/config-2.6.32.10-custom
CONFIG_X86_64_ACPI_NUMA=y
# Power management and ACPI options
CONFIG_ACPI=y
CONFIG_ACPI_SLEEP=y
CONFIG_ACPI_PROCFS=y
CONFIG_ACPI_PROCFS_POWER=y
# CONFIG_ACPI_POWER_METER is not set
CONFIG_ACPI_SYSFS_POWER=y
CONFIG_ACPI_PROC_EVENT=y
CONFIG_ACPI_AC=y
CONFIG_ACPI_BATTERY=y
CONFIG_ACPI_BUTTON=y
CONFIG_ACPI_VIDEO=m
CONFIG_ACPI_FAN=y
CONFIG_ACPI_DOCK=y
CONFIG_ACPI_PROCESSOR=y
CONFIG_ACPI_HOTPLUG_CPU=y
# CONFIG_ACPI_PROCESSOR_AGGREGATOR is not set
CONFIG_ACPI_THERMAL=y
CONFIG_ACPI_NUMA=y
CONFIG_ACPI_CUSTOM_DSDT_FILE=""
# CONFIG_ACPI_CUSTOM_DSDT is not set
CONFIG_ACPI_BLACKLIST_YEAR=0
CONFIG_ACPI_DEBUG=y
# CONFIG_ACPI_DEBUG_FUNC_TRACE is not set
CONFIG_ACPI_PCI_SLOT=y
CONFIG_ACPI_CONTAINER=y
CONFIG_ACPI_SBS=y
CONFIG_X86_ACPI_CPUFREQ=y
CONFIG_HOTPLUG_PCI_ACPI=m
CONFIG_HOTPLUG_PCI_ACPI_IBM=m
CONFIG_PNPACPI=y
CONFIG_ATA_ACPI=y
CONFIG_PATA_ACPI=y
# ACPI drivers
# ACPI drivers
CONFIG_THINKPAD_ACPI=m
CONFIG_THINKPAD_ACPI_DEBUGFACILITIES=y
# CONFIG_THINKPAD_ACPI_DEBUG is not set
# CONFIG_THINKPAD_ACPI_UNSAFE_LEDS is not set
CONFIG_THINKPAD_ACPI_VIDEO=y
CONFIG_THINKPAD_ACPI_HOTKEY_POLL=y
CONFIG_ACPI_WMI=y
# CONFIG_ACPI_ASUS is not set
CONFIG_ACPI_TOSHIBA=m


but, interestingly, the ACPI states are not listed in /proc/acpi/info:

# cat /proc/acpi/info
version:                 20090903


what could be wrong?

dmesg does report ACPI messages:

# dmesg | grep ACPI
[    0.000000]  BIOS-e820: 00000000bf75c000 - 00000000bf7bf000 (ACPI NVS)
[    0.000000]  BIOS-e820: 00000000bf7e4000 - 00000000bf7ff000 (ACPI data)
[    0.000000]  modified: 00000000bf75c000 - 00000000bf7bf000 (ACPI NVS)
[    0.000000]  modified: 00000000bf7e4000 - 00000000bf7ff000 (ACPI data)
[    0.000000] ACPI: RSDP 00000000000fe020 00024 (v02 HP    )
[    0.000000] ACPI: XSDT 00000000bf7fe120 0009C (v01 HPQOEM SLIC-MPC
00000001      01000013)
[    0.000000] ACPI: FACP 00000000bf7fc000 000F4 (v04 HP     SLIC-MPC
00000001 MSFT 01000013)
[    0.000000] ACPI: DSDT 00000000bf7ee000 0ABEA (v02 HP     SLIC-MPC
00000001 MSFT 01000013)
[    0.000000] ACPI: FACS 00000000bf76e000 00040
[    0.000000] ACPI: ASF! 00000000bf7fd000 000A5 (v32 HPQOEM SLIC-MPC
00000001 MSFT 01000013)
[    0.000000] ACPI: HPET 00000000bf7fb000 00038 (v01 HPQOEM SLIC-MPC
00000001 MSFT 01000013)
[    0.000000] ACPI: APIC 00000000bf7fa000 0008C (v02 HPQOEM SLIC-MPC
00000001 MSFT 01000013)
[    0.000000] ACPI: MCFG 00000000bf7f9000 0003C (v01 HPQOEM SLIC-MPC
00000001 MSFT 01000013)
[    0.000000] ACPI: SLIC 00000000bf7ed000 00176 (v01 HPQOEM SLIC-MPC
00000001 MSFT 01000013)
[    0.000000] ACPI: SSDT 00000000bf7ec000 0073D (v01 TrmRef PtidDevc
00001000 INTL 20051117)
[    0.000000] ACPI: SSDT 00000000bf7eb000 00172 (v01  VaRef  Va_Acpi
00003000 INTL 20051117)
[    0.000000] ACPI: BOOT 00000000bf7ea000 00028 (v01 HPQOEM SLIC-MPC
00000001 MSFT 01000013)
[    0.000000] ACPI: SSDT 00000000bf7e9000 00C39 (v01 INTEL   SataPri
00001000 INTL 20051117)
[    0.000000] ACPI: SSDT 00000000bf7e8000 006C5 (v01 INTEL   SataSec
00001000 INTL 20051117)
[    0.000000] ACPI: SPCR 00000000bf7e7000 00050 (v01 HPQOEM SLIC-MPC
00000000 MSFT 01000013)
[    0.000000] ACPI: ASPT 00000000bf7e6000 00034 (v04 HPQOEM SLIC-MPC
00000001 MSFT 01000013)
[    0.000000] ACPI: WDAT 00000000bf7e5000 00224 (v01 HPQOEM SLIC-MPC
00000001 MSFT 01000013)
[    0.000000] ACPI: SSDT 00000000bf7e4000 009F1 (v01  PmRef    CpuPm
00003000 INTL 20051117)
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] ACPI: PM-Timer IO Port: 0x408
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x03] lapic_id[0x04] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x04] lapic_id[0x06] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x05] lapic_id[0x01] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x06] lapic_id[0x03] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x07] lapic_id[0x05] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x08] lapic_id[0x07] enabled)
[    0.000000] ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0])
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
[    0.000000] ACPI: IRQ0 used by override.
[    0.000000] ACPI: IRQ2 used by override.
[    0.000000] ACPI: IRQ9 used by override.
[    0.000000] Using ACPI (MADT) for SMP configuration information
[    0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000
[    0.011966] ACPI: Core revision 20090903
[    1.973050] ACPI FADT declares the system doesn't support PCIe ASPM,
so disable it
[    1.973055] ACPI: bus type pci registered
[    1.997538] ACPI: EC: Look up EC in DSDT
[    2.001806] ACPI: Executed 1 blocks of module-level executable AML code
[    2.010823] ACPI: BIOS _OSI(Linux) query ignored
[    2.027144] ACPI Error (psargs-0359): [\_PR_.CPU0._PPC] Namespace
lookup failure, AE_NOT_FOUND
[    2.027157] ACPI Error (psparse-0537): Method parse/execution failed
[\CPUT] (Node ffff8802370570a0), AE_NOT_FOUND
[    2.027245] ACPI Error (psparse-0537): Method parse/execution failed
[\PSSC] (Node ffff8802370570c0), AE_NOT_FOUND
[    2.027329] ACPI Error (psparse-0537): Method parse/execution failed
[\_SB_.PCI0.LPCB.EC0_._REG] (Node ffff88023703fa60), AE_NOT_FOUND
[    2.027553] ACPI: Interpreter enabled
[    2.027562] ACPI: (supports S0 S3 S4 S5)
[    2.027653] ACPI: Using IOAPIC for interrupt routing
[    2.029186] PM: Adding info for acpi:ACPI0003:00
[    2.034019] PM: Adding info for acpi:ACPI0008:00
[    2.052588] ACPI: EC: GPE = 0x16, I/O: command/status = 0x66, data = 0x62
[    2.054369] ACPI: ACPI Dock Station Driver: 1 docks/bays found
[    2.056466] ACPI: PCI Root Bridge [PCI0] (0000:00)
[    2.063919] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT]
[    2.064472] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.P0P1._PRT]
[    2.064908] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.RP01._PRT]
[    2.065171] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.RP02._PRT]
[    2.065529] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEG3._PRT]
[    2.065791] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEG5._PRT]
[    2.092630] ACPI: PCI Root Bridge [CPBG] (0000:ff)
[    2.094790] ACPI: PCI Interrupt Link [LNKA] (IRQs 1 3 4 5 6 7 10 12
14 15) *11
[    2.095129] ACPI: PCI Interrupt Link [LNKB] (IRQs 1 3 4 5 6 7 *11 12
14 15)
[    2.095480] ACPI: PCI Interrupt Link [LNKC] (IRQs 1 3 4 5 6 7 10 12
14 15) *0, disabled.
[    2.095818] ACPI: PCI Interrupt Link [LNKD] (IRQs 1 3 4 5 6 7 11 12
14 15) *10
[    2.096154] ACPI: PCI Interrupt Link [LNKE] (IRQs 1 3 4 5 6 7 10 12
14 15) *11
[    2.096485] ACPI: PCI Interrupt Link [LNKF] (IRQs 1 3 4 5 6 7 11 12
14 15) *0, disabled.
[    2.096822] ACPI: PCI Interrupt Link [LNKG] (IRQs 1 3 4 5 6 7 10 12
14 15) *11
[    2.097157] ACPI: PCI Interrupt Link [LNKH] (IRQs 1 3 4 5 6 7 11 12
14 15) *0, disabled.
[    2.098237] ACPI: WMI: Mapper loaded
[    2.098240] PCI: Using ACPI for IRQ routing
[    2.158194] pnp: PnP ACPI init
[    2.158217] ACPI: bus type pnp registered
[    2.167627] pnp: PnP ACPI: found 12 devices
[    2.167631] ACPI: ACPI bus type pnp unregistered
[    5.030257] ACPI: AC Adapter [ACAD] (on-line)
[    5.030342] ACPI: Power Button [PWRB]
[    5.030756] ACPI: Lid Switch [LID0]
[    5.030820] ACPI: Power Button [PWRF]
[    5.032711] ACPI: SSDT 00000000bf691a98 002DA (v01  PmRef  Cpu0Ist
00003000 INTL 20051117)
[    5.033611] ACPI: SSDT 00000000bf690618 005CD (v01  PmRef  Cpu0Cst
00003001 INTL 20051117)
[    5.035264] ACPI: SSDT 00000000bf691718 00303 (v01  PmRef    ApIst
00003000 INTL 20051117)
[    5.036219] ACPI: SSDT 00000000bf68fd98 00119 (v01  PmRef    ApCst
00003000 INTL 20051117)
[    5.053104] ACPI: Thermal Zone [TZ01] (64 C)
[    5.060449] ACPI: Battery Slot [BAT0] (battery present)
[    5.060818] ACPI: Battery Slot [BAT1] (battery absent)
[    6.736640] ACPI: Video Device [VGA1] (multi-head: yes  rom: no
post: no)
[    7.933379] pci 0000:01:00.0: power state changed by ACPI to D0



as for in the BIOS, I don't see an option to enable / disable ACPI.
also, the same laptop powers down fine on Windows - this might be an
indication that things should be OK on the BIOS side?

is there anywhere else I could look for the cause of this problem?


Akos

Re: how to debug a kernel that does not power off?

[Robert Hancock]

On 03/26/2010 01:56 PM, Arnout Vandecappelle wrote:
>   Take a look at the pm_power_off functions in arch/x86/kernel/apm_32.c
>
>   Regards,
>   Arnout

Any modern machine will be using ACPI functions to power off, not APM.. 
CCing the linux-acpi list.

>
> On Wednesday 24 March 2010 00:44:30, Ákos Maróy wrote:
>> Hi,
>>
>> This might be a lame question, but: how would I debug a kernel that
>> simply does not power off a machine? When powering off, on the console I
>> get to the message: [...] Poweroff.
>>
>> but then, the machine actually does not power off. This is an HP Envy 15
>> laptop using an intel i7 CPU, and kernel 2.6.32.9.
>>
>> I tried to read up on all sorts of documentation, but could not get more
>> debug info out of the kernel :(
>>
>> any pointers would be welcome..
>>
>>
>> Akos
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel"
>> in the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at  http://www.tux.org/lkml/
>

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