From mboxrd@z Thu Jan  1 00:00:00 1970
From: Francois Romieu <romieu@fr.zoreil.com>
Subject: Re: r8168 is needed to enter P-state: Package State 6 (pc6) on
 Haswell hardware
Date: Sun, 5 Oct 2014 18:59:20 +0200
Message-ID: <20141005165920.GA21926@electric-eye.fr.zoreil.com>
References: <542B3829.3010108@crashplan.pro>
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Cc: Realtek linux nic maintainers <nic_swsd@realtek.com>,
	netdev@vger.kernel.org
To: Ceriel Jacobs <linux-ide@crashplan.pro>
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Ceriel Jacobs <linux-ide@crashplan.pro> :
> With in-kernel r8169 module, only P-state package C3 (pc3) can be reached
> when enabling ASPM.
> 
> Only after installing r8168 driver (and enabling ASPM), a Haswell Celeron
> G1820/G1840 processer will enter package C6 state (pc6).

Vanilla kernel r8169 driver logs a message that contains an "XID" string.
Please grep for it in your dmesg so that I can narrow the search for 
meaningful differences in Realtek's r8168 driver.

Thanks.

-- 
Ueimor