linux-kernel - Re: kernel panic when plugging in USB device and closing lid

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20080616123623.GA21609@srcf.ucam.org>
Date:	Mon, 16 Jun 2008 13:36:23 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Martin Michlmayr <tbm@...ius.com>
Cc:	linux-kernel@...r.kernel.org, keithp@...thp.com,
	linux-acpi@...r.kernel.org
Subject: Re: kernel panic when plugging in USB device and closing lid

On Mon, Jun 16, 2008 at 02:32:38PM +0200, Martin Michlmayr wrote:

> I briefly talked to Matthew Garrett on IRC who said this "looks like
> state corruption".  He asked me to set /proc/acpi/video/blah/DOS to 7
> and see whether I could still reproduce the problem.  After setting
> this value, I no longer see the kernel panic.  Matthew: "Right.  The
> lid-close SMM seems to blow things up some of the time."

If DOS is set to 1, the BIOS seems to do something that makes the kernel 
massively unhappy. Disabling the automatic display switch control avoids 
this, which makes me think it's a BIOS bug of some description.

-- 
Matthew Garrett | mjg59@...f.ucam.org
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/