linux-kernel - Re: ACPI regression? Was Re: Ethernet chip disappeared from lspci

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Message-ID: <20150620074506.GA4000@rhlx01.hs-esslingen.de>
Date:	Sat, 20 Jun 2015 09:45:06 +0200
From:	Andreas Mohr <andi@...as.de>
To:	zb@...ertec.at
Cc:	linux-kernel@...r.kernel.org
Subject: Re: ACPI regression? Was Re: Ethernet chip disappeared from lspci

Hi,

[lkml.org still broken --> no accurate mail header info possible...]

Just to ask the obvious:
I assume using /sys/bus/pci/rescan does not help once it's broken?
(since the machine comes up empty at initial-boot scan, too)

Also, you could try diffing lspci -vvxxx -s.... output
of working vs. "distorting" kernel version - perhaps some register setup
has been changed (e.g. due to power management improvements or some such),
which may encourage the card
to get a problematic/corrupt state.

> Upon powering off the system,
> the r8169 driver compained about "rtl_eriar_cond = 1 loop 100"

Yup, that seems to be
rtl_eri_read() in ethernet/realtek/r8169.c
waiting on low condition of
    RTL_R32(ERIAR) & ERIAR_FLAG;

Andreas Mohr
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