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From: "H. Peter Anvin" <hpa@zytor.com>
To: David Fries <david@fries.net>
Cc: Ingo Molnar <mingo@elte.hu>,
	linux-kernel@vger.kernel.org, "Rafael J. Wysocki" <rjw@sisk.pl>,
	Pavel Machek <pavel@ucw.cz>, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH] i486 CR4 oops, no_console_suspend
Date: Wed, 20 Aug 2008 22:37:15 -0700	[thread overview]
Message-ID: <48ACFF0B.6090008@zytor.com> (raw)
In-Reply-To: <20080821041721.GE17528@spacedout.fries.net>

David Fries wrote:
> On Tue, Aug 19, 2008 at 09:07:26AM -0700, H. Peter Anvin wrote:
>> Ingo Molnar wrote:
>>> i've had trouble no end with getting even kernel messages out to the 
>>> serial console during critical phases of suspend/resume. (especially in 
>>> combination with earlyprintk=ttyS0 - not surprisingly)
>>>
>>> Especially during resume the UART is initialized back to something 
>>> really slow - 300 bauds or 9600 bauds. (depends on the chipset i guess) 
>>> So even though it works, it will only worked reliably when i 
>>> standardized all my baud settings to that very low setting.
>>>
>> Probably depends on the BIOS, actually; I suspect you end up with the 
>> standard BIOS setting, which is *usually* 9600 bps.
> 
> I have grub, the kernel, and a getty all set to 115200, for suspend,
> resume, or reboot it's always 115200.  With grub there's no BIOS
> guessing, it sets it to a configured state.
> 

Most likely it never gets reinitialized during resume.  This is a bug, 
obviously.

	-hpa

      reply	other threads:[~2008-08-21  5:41 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-08-18  4:03 [PATCH] Fix i486 suspend to disk CR4 oops David Fries
2008-08-18  4:14 ` Maciej W. Rozycki
2008-08-18  4:35   ` H. Peter Anvin
2008-08-18  6:04     ` Andi Kleen
2008-08-18  6:34       ` H. Peter Anvin
2008-08-18  6:42         ` Andi Kleen
2008-08-18  6:41 ` Ingo Molnar
2008-08-18  6:45   ` H. Peter Anvin
2008-08-18  9:15   ` Pavel Machek
2008-08-18 10:16   ` Rafael J. Wysocki
2008-08-18 12:58   ` David Fries
2008-08-18 13:25     ` Ingo Molnar
2008-08-18 14:41       ` Maciej W. Rozycki
2008-08-18 14:38     ` Maciej W. Rozycki
2008-08-18 22:04     ` Pavel Machek
2008-08-18 22:10       ` H. Peter Anvin
2008-08-18 15:24   ` Dave Jones
2008-08-18 16:04     ` Lennart Sorensen
2008-08-18 17:17       ` Dave Jones
2008-08-18 17:32     ` H. Peter Anvin
2008-08-18 22:02       ` Pavel Machek
2008-08-19  3:37   ` [PATCH] i486 CR4 oops, no_console_suspend David Fries
2008-08-19  9:34     ` Ingo Molnar
2008-08-19 16:07       ` H. Peter Anvin
2008-08-21  4:17         ` David Fries
2008-08-21  5:37           ` H. Peter Anvin [this message]

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