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Date:	Thu, 03 Apr 2014 14:30:50 +0800
From:	"Li, Aubrey" <aubrey.li@...ux.intel.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: FW: [BUG] x86: reboot doesn't reboot

> From: Steven Rostedt [mailto:rostedt@...dmis.org]
> Sent: Thursday, April 03, 2014 2:14 PM
> To: Linus Torvalds; LKML
> Cc: Ingo Molnar; H. Peter Anvin; Thomas Gleixner; Li, Aubrey; Matthew Garrett
> Subject: [BUG] x86: reboot doesn't reboot
>
> I noticed that one of my test boxes no longer does a reboot with the latest
> kernel. It goes down and shows:
>
> [   51.589896] reboot: Restarting system
> [   51.593567] reboot: machine restart
>
>
> And the system sounds like it turns off (the fans stop), but then I just sit there
> and wait, and wait and wait. The system never starts up again.
>
> I did a bisect and it landed on: a4f1987e4c54 "x86, reboot: Add EFI and
> CF9 reboot methods into the default list" which looks like a very likely suspect. I
> removed that and fb3bd7b19b2b, as the second commit was just a fix up of the
> first, recompiled, installed and rebooted to that kernel. I tried to reboot again
> and sure enough after posting the "machine restart" I started getting those
> "Press any key to continue."
> messages again. That's a good sign.
>
> Linus mentioned to me to use "reboot=pci" on the kernel command line, but no
> dice. That doesn't seem to make a difference.

May I know if "reboot=t" make any difference on your system with the change?

Thanks,
-Aubrey
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