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    SubjectRe: [PATCH] reset VGA adapters via BIOS on resume... (non-fbdev/con)
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    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.

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