The ACPI Global Lock is in fact intended to provide exclusion between the BIOS and the OS. Bob > -----Original Message----- > From: Tang, Feng > Sent: Friday, November 09, 2012 1:29 AM > To: Rafael J. Wysocki > Cc: Greg KH; Azat Khuzhin; linux-acpi@xxxxxxxxxxxxxxx; Linux Kernel > Mailing List; Zheng, Lv; Len Brown; Moore, Robert > Subject: Re: ACPI errors with 3.7-rc3 > > On Thu, Nov 08, 2012 at 05:49:40AM +0800, Rafael J. Wysocki wrote: > > On Tuesday, November 06, 2012 01:48:26 PM Greg KH wrote: > > > On Tue, Nov 06, 2012 at 04:42:24PM +0400, Azat Khuzhin wrote: > > > > I'v also have such errors on my macbook pro. > > > > > > > > $ dmesg | tail > > > > [17056.008564] ACPI Error: Method parse/execution failed > > > > [\_SB_.PCI0.LPCB.EC__.SMB0.SBRW] (Node ffff88026547ea10), AE_TIME > > > > (20120711/psparse-536) > > > > [17056.011194] ACPI Error: Method parse/execution failed > > > > [\_SB_.BAT0.UBST] (Node ffff88026547e678), AE_TIME > > > > (20120711/psparse-536) > > > > [17056.013793] ACPI Error: Method parse/execution failed > > > > [\_SB_.BAT0._BST] (Node ffff88026547e740), AE_TIME > > > > (20120711/psparse-536) > > > > [17056.016383] ACPI Exception: AE_TIME, Evaluating _BST > > > > (20120711/battery-464) [17056.511373] ACPI: EC: input buffer is > > > > not empty, aborting transaction [17056.512672] ACPI Exception: > > > > AE_TIME, Returned by Handler for [EmbeddedControl] > > > > (20120711/evregion-501) [17056.515256] ACPI Error: Method > > > > parse/execution failed [\_SB_.PCI0.LPCB.EC__.SMB0.SBRW] (Node > > > > ffff88026547ea10), AE_TIME > > > > (20120711/psparse-536) > > > > [17056.517886] ACPI Error: Method parse/execution failed > > > > [\_SB_.BAT0.UBST] (Node ffff88026547e678), AE_TIME > > > > (20120711/psparse-536) > > > > [17056.520479] ACPI Error: Method parse/execution failed > > > > [\_SB_.BAT0._BST] (Node ffff88026547e740), AE_TIME > > > > (20120711/psparse-536) > > > > [17056.523070] ACPI Exception: AE_TIME, Evaluating _BST > > > > (20120711/battery-464) > > > > > > I'm seeing this again right now. I'm wondering if it's because I'm > > > running on battery power at the moment: > > > > > > [41694.309264] ACPI Exception: AE_TIME, Returned by Handler for > > > [EmbeddedControl] (20120913/evregion-501) [41694.309282] ACPI Error: > > > Method parse/execution failed [\_SB_.PCI0.LPCB.EC__.SMB0.SBRW] (Node > > > ffff88045cc64618), AE_TIME (20120913/psparse-536) [41694.309300] > > > ACPI Error: Method parse/execution failed [\_SB_.BAT0.UBST] (Node > > > ffff88045cc64988), AE_TIME (20120913/psparse-536) [41694.309310] > > > ACPI Error: Method parse/execution failed [\_SB_.BAT0._BST] (Node > > > ffff88045cc648c0), AE_TIME (20120913/psparse-536) [41694.309324] > > > ACPI Exception: AE_TIME, Evaluating _BST (20120913/battery-464) > > > [41694.809093] ACPI: EC: input buffer is not empty, aborting > > > transaction > > > > > > ec_storm_threshold is still set to 8 in /sys/module/acpi/parameters/ > > > so that's not the issue here. > > > > > > > And also loadavg is too high ~ 10 > > > > While there is no process that load CPU up to 100% or like that. > > > > I think that this because of processes that is done in kernel space. > > > > (basically that one who write such errors) > > > > > > > > $ uname -a > > > > Linux macbook-pro-sq 3.6.5macbook-pro-custom-v0.1 #4 SMP Sun Nov 4 > > > > 12:39:03 UTC 2012 x86_64 GNU/Linux > > > > > > Ah, ok, that means it's not something new in 3.7-rc, so maybe it's > > > just never worked properly for this hardware :) > > > > > > So it's not a regression, just an ACPI issue, any ACPI developer > > > have an idea about this? > > > > Can you please send the output of acpidump from the affected machine(s)? > > I doubt this problem is sometimes inevitable for some machines, because > AFAIK most modern machines have the race problem for EC HW controller, as > both OS side and the BIOS may access the EC HW at the same time > without any race control. > > For this case, usually the battery and thermal modules (which may be > controlled through EC) are always monitored by BIOS, when OS also > frequently visit them too, the EC's own state machine may be broken and > not responsive due to the race, then cause the timeout error. > And how severe the problem will be depends on the EC HW, the quality of > BIOS code and OS/driver code. > > Myself have seen the similar "ACPI: EC: input buffer is not empty, > aborting transaction" error message on one laptop when its EC is busy > visited by OS. > > btw, in EC driver I see a "ec->global_lock", don't know if it was designed > to control the race between OS and BIOS. > > Thanks, > Feng -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
