linux-kernel - Re: Hibernate resume bug around 3,18-rc2

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Message-ID: <30cf6b91068d178445adac701fe49c79.squirrel@webmail.iit.demokritos.gr>
Date:	Fri, 20 Nov 2015 12:04:34 +0200
From:	vasvir@....demokritos.gr
To:	"Juergen Gross" <jgross@...e.com>
Cc:	linux-kernel@...r.kernel.org, "Toshi Kani" <toshi.kani@...com>,
	"Luis R. Rodriguez" <mcgrof@...e.com>
Subject: Re: Hibernate resume bug around 3,18-rc2 - Full PAT support

> I've just found a potential issue: In case MTRR is disabled by the BIOS
> the PAT register of the boot processor won't be restored after resume.
>
> Can you check whether pr_info("MTRR: Disabled\n") has been executed in
> early boot? If yes, this might be a BIOS option.
>

I don't have access right now. I will test it later tonight (This is my
home machine).

Would $dmesg | grep -i mtrr suffice or I need to look for the mtrr
somewere else e.g. /proc /sys etc?


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