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Date: Tue, 18 Mar 2008 10:23:07 -0700
From: "Tim Elliott" <tle@...ymonkey.com>
To: "Alexey Starikovskiy" <astarikovskiy@...e.de>
Cc: "Guillaume Chazarain" <guichaz@...il.com>,
linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
lenb@...nel.org
Subject: Re: ACPI regression in 2.6.25-rc6 (function keys stop working)
I am seeing the same problem on my Lenovo 3000 v100. The function keys
stopped working.
tim@...-len:~$ cat /proc/interrupts
CPU0 CPU1
0: 164105 0 IO-APIC-edge timer
1: 12560 0 IO-APIC-edge i8042
9: 6 0 IO-APIC-fasteoi acpi
12: 117534 0 IO-APIC-edge i8042
14: 51 0 IO-APIC-edge ide0
16: 31 0 IO-APIC-fasteoi uhci_hcd:usb4,
i915@pci:0000:00:02.0
18: 121892 0 IO-APIC-fasteoi uhci_hcd:usb3, iwl3945
19: 36197 0 IO-APIC-fasteoi uhci_hcd:usb2, ahci
20: 7931 0 IO-APIC-fasteoi eth0
22: 11071 0 IO-APIC-fasteoi sdhc0:slot0, HDA Intel
23: 5 0 IO-APIC-fasteoi uhci_hcd:usb1, ehci_hcd:usb5
NMI: 0 0 Non-maskable interrupts
LOC: 11296 73879 Local timer interrupts
RES: 23199 49164 Rescheduling interrupts
CAL: 297 27033 function call interrupts
TLB: 838 1286 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
SPU: 0 0 Spurious interrupts
ERR: 0
The problem goes away when reverting 2c81ce4c9c37b910210f2640c28e98a0c398dc26
Reverting the above and applying the patch in comment #38 of bug #9998
also works (http://bugzilla.kernel.org/show_bug.cgi?id=9998).
Cheers,
Tim
On 3/18/08, Alexey Starikovskiy <astarikovskiy@...e.de> wrote:
> Hi Guillaume,
>
> Please check if the patch to call _PSW methods, attached to bug #9998
> helps to reduce number of ACPI interrupts if you revert the 2c81ce4c9c3
>
> Thanks,
> Alex.
>
>
> Guillaume Chazarain wrote:
> > Hi,
> >
> > There is an ACPI regression in 2.6.25-rc6, which causes the ACPI keys
> > to stop working on my laptop, an Asus V6VA. git bisect identified the
> > appended commit as guilty, and reverting it indeed fixes the problem
> > for me. Attached are my .config, a good dmesg and a bad one. The diff
> > between both dmesg reveals this interesting hunk:
> >
> > @@ -121,8 +121,9 @@
> > ACPI: (supports S0 S1 S3 S4 S5)
> > ACPI: Using IOAPIC for interrupt routing
> > ACPI: EC: non-query interrupt received, switching to interrupt mode
> > +ACPI: EC: GPE storm detected, disabling EC GPE
> > ACPI: EC: GPE = 0x1c, I/O: command/status = 0x66, data = 0x62
> > -ACPI: EC: driver started in interrupt mode
> > +ACPI: EC: driver started in poll mode
> > ACPI: PCI Root Bridge [PCI0] (0000:00)
> > pci 0000:00:1f.0: Enabled ICH6/i801 SMBus device
> > pci 0000:00:1f.0: quirk: region 0800-087f claimed by ICH6 ACPI/GPIO/TCO
> >
> >
> > Thanks.
> >
> >
> > commit 2c81ce4c9c37b910210f2640c28e98a0c398dc26
> > Author: Alexey Starikovskiy <astarikovskiy@...e.de>
> > Date: Tue Mar 11 13:30:00 2008 -0400
> >
> > ACPI: EC: Handle IRQ storm on Acer laptops
> >
> > On some Acer systems, the HW fails to clear the GPE source,
> > causing an interrupt storm.
> >
> > So in EC interrupt mode, we count how many interrupts we
> > receive when waiting. If we get more than 5, we give
> > up on interrupt mode and revert to polling mode.
> >
> > Also, for polling mode to work on Acers, we need
> > to insert a delay.
> >
> > Signed-off-by: Alexey Starikovskiy <astarikovskiy@...e.de>
> > Signed-off-by: Len Brown <len.brown@...el.com>
> >
> > diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
> > index caf873c..2c77359 100644
> > --- a/drivers/acpi/ec.c
> > +++ b/drivers/acpi/ec.c
> > @@ -129,6 +129,7 @@ static struct acpi_ec {
> > struct mutex lock;
> > wait_queue_head_t wait;
> > struct list_head list;
> > + atomic_t irq_count;
> > u8 handlers_installed;
> > } *boot_ec, *first_ec;
> >
> > @@ -181,6 +182,8 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum
> > ec_event event, int force_poll)
> > {
> > int ret = 0;
> >
> > + atomic_set(&ec->irq_count, 0);
> > +
> > if (unlikely(event == ACPI_EC_EVENT_OBF_1 &&
> > test_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags)))
> > force_poll = 1;
> > @@ -227,6 +230,7 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum
> > ec_event event, int force_poll)
> > while (time_before(jiffies, delay)) {
> > if (acpi_ec_check_status(ec, event))
> > goto end;
> > + msleep(5);
> > }
> > }
> > pr_err(PREFIX "acpi_ec_wait timeout,"
> > @@ -529,6 +533,13 @@ static u32 acpi_ec_gpe_handler(void *data)
> > struct acpi_ec *ec = data;
> >
> > pr_debug(PREFIX "~~~> interrupt\n");
> > + atomic_inc(&ec->irq_count);
> > + if (atomic_read(&ec->irq_count) > 5) {
> > + pr_err(PREFIX "GPE storm detected, disabling EC GPE\n");
> > + acpi_disable_gpe(NULL, ec->gpe, ACPI_ISR);
> > + clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
> > + return ACPI_INTERRUPT_HANDLED;
> > + }
> > clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
> > if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))
> > wake_up(&ec->wait);
> >
> >
>
>
> --
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