From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Matthew Garrett <mgarrett@chiark.greenend.org.uk>
Cc: Dave Airlie <airlied@linux.ie>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] reset VGA adapters via BIOS on resume... (non-fbdev/con)
Date: Sat, 23 Jul 2005 20:55:37 +0100 [thread overview]
Message-ID: <1122148537.27629.8.camel@localhost.localdomain> (raw)
In-Reply-To: <E1Dw6lc-0007IU-00@chiark.greenend.org.uk>
On Sad, 2005-07-23 at 00:17 +0100, Matthew Garrett wrote:
> Dave Airlie <airlied@linux.ie> wrote:
>
> > At OLS at lot of people were giving out about cards not resuming,
> > so using a patch from Michael Marineau and help from lots of people
> > sitting around in a circle at OLS I've gotten a patch that restores video
> > on my laptop by going into real mode and re-posting the BIOS during
> > resume,
>
> On laptops, the code at c000:0003 may jump to BIOS code that isn't
> present after system boot. In userspace, this isn't too much of a
> problem - the userspace code tends to just fall over rather than hanging
> the machine. What happens if the kernel hits illegal or inappropriate
> code on resume?
For Intel at least the recommendation is to use the BIOS "save
mode"/"restore mode" interface.
next prev parent reply other threads:[~2005-07-23 19:33 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-22 18:52 [PATCH] reset VGA adapters via BIOS on resume... (non-fbdev/con) Dave Airlie
2005-07-22 23:17 ` Matthew Garrett
2005-07-23 0:31 ` Pavel Machek
2005-07-23 0:36 ` Matthew Garrett
2005-07-23 0:47 ` Pavel Machek
2005-07-23 6:53 ` Stefan Smietanowski
2005-07-24 6:08 ` Keith Owens
2005-07-25 6:39 ` Stefan Seyfried
2005-07-25 7:43 ` Dave Airlie
2005-07-25 7:48 ` Stefan Seyfried
2005-07-23 19:55 ` Alan Cox [this message]
2005-07-23 22:37 ` Dave Airlie
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