linux-kernel - Re: Regression between rc2 and rc6: ACPI EC problems

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Date:	Wed, 06 Jul 2016 23:28:55 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Lv Zheng <lv.zheng@...el.com>
Subject: Re: Regression between rc2 and rc6: ACPI EC problems

On Wednesday, July 06, 2016 11:14:11 PM Wolfram Sang wrote:
> Hi,
> 
> when upgrading from v4.7-rc2 to rc6 on my Dell Mini 9, battery and
> temperature status info got bogus. Here is the major change between the
> boot logs:
> 
> ACPI : EC: EC stopped
> ACPI Exception: AE_BAD_PARAMETER, Returned by Handler for [EmbeddedControl] (20160422/evregion-300)
> ACPI Error: Method parse/execution failed [\_SB.PCI0.LPCB.EC0._REG] (Node f5d09870), AE_BAD_PARAMETER (20160422/psparse-542)
> ACPI Exception: AE_BAD_PARAMETER, from region _REG, [EmbeddedControl] (20160422/evregion-397)
> ACPI Exception: AE_BAD_PARAMETER, Returned by Handler for [EmbeddedControl] (20160422/evregion-300)
> ACPI Error: Method parse/execution failed [\_SB.PCI0.LPCB.EC0._REG] (Node f5d09870), AE_BAD_PARAMETER (20160422/psparse-542)
> ACPI Exception: AE_BAD_PARAMETER, from region _REG, [EmbeddedControl] (20160422/evregion-397)
> ACPI : EC: GPE = 0x19, I/O: command/status = 0x66, data = 0x62
> ACPI : EC: EC started
> 
> The only config changes between the kernels were enabling MMC block
> devices and DM_CRYPT. Not likely to cause the above, I'd think.
> 
> Does that ring a bell for someone? This little machine has only an SSD
> without TRIM, so bisecting is not really an option. I can provide more
> info and test patches, though.

There is one commit related directly to EC between -rc2 and -rc6:

dcf15cbded65 ACPI / EC: Fix a boot EC regresion by restoring boot EC support for the DSDT EC

There also are two ACPICA commits in that frame that may be related to it

2f38b1b16d92 ACPICA: Namespace: Fix deadlock triggered by MLC support in dynamic table loading
da4e792550a8 Revert "ACPICA: ACPI 2.0, Hardware: Add access_width/bit_offset support for acpi_hw_write()"

but one of them is a revert, so can you please check dcf15cbded65 and 2f38b1b16d92?

Thanks,
Rafael

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