linux-kernel - Re: [2.6.28-rc2] EeePC ACPI errors & exceptions

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Date:	Tue, 28 Oct 2008 17:42:46 +0800
From:	Zhao Yakui <yakui.zhao@...el.com>
To:	Darren Salt <linux@...mustbejoking.demon.co.uk>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [2.6.28-rc2] EeePC ACPI errors & exceptions

On Mon, 2008-10-27 at 15:52 -0700, Darren Salt wrote:
> EeePC 901, BIOS revision 1603, current Debian lenny; running on AC.
> 
> I've noticed the following errors & exceptions, apparently coinciding with
> the startup of xfce4-sensors-plugin:
> 
> ACPI: EC: missing confirmations, switch off interrupt mode.
> ACPI Exception (evregion-0419): AE_TIME, Returned by Handler for [EmbeddedControl] [20080926]
> ACPI Error (psparse-0524): Method parse/execution failed [\_SB_.PCI0.SBRG.EC0_.BST2] (Node f7030d38), AE_TIME
> ACPI Error (psparse-0524): Method parse/execution failed [\_SB_.PCI0.CBST] (Node f70336f8), AE_TIME
> ACPI Error (psparse-0524): Method parse/execution failed [\_SB_.PCI0.BAT0._BST] (Node f7031c48), AE_TIME
> ACPI Exception (battery-0360): AE_TIME, Evaluating _BST [20080926]
Will you please try the attached patch on the 2.6.28-rc2 and see whether
the issue still exists?
    After the test, please attach the output of dmesg.
    

The following is included by the attached patch.
   a. EC transaction is divided into several phases.
        For example: EC write transaction
        a. issue EC write command
        b. wait until the input is empty and then write the internal
address
        c. wait until the input is empty and write the data
        d. wait until the input is empty. If it is empty, it indicates
        that EC transaction is finished.
   At the same time EC driver will be started in EC GEP mode. And when
there is no EC GPE confirmation for some EC transaction on some broken
laptops,the EC driver will be switched to polling mode. But EC GPE is
still enabled.

b. Some delay is added in the EC GPE handler on some broken BIOS.
   The delay won't be added for most laptops.Only when more than five
interrupts happen in the same jiffies and EC status are the same, OS
will add some delay in the EC GPE handler. If the same issue still
happens after adding delay,the delay time will be increased.But the max
delay time is ten microseconds.

Thanks.

> 
> Also, this (which, unlike the above, is also present with 2.6.27.*):
> 
> ACPI: I/O resource 0000:00:1f.3 [0x400-0x41f] conflicts with ACPI region SMRG [0x400-0x40f]
> ACPI: Device needs an ACPI driver
> 
> Full dmesg & config are attached.
> 
> (The Elantech touchpad patch from http://arjan.opmeer.net/elantech/ is
> applied to this kernel.)
> 

View attachment "ec_all.patch" of type "text/x-patch" (16359 bytes)