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    SubjectRe: [RFC] Reliable video POSTing on resume (was: Re: [ACPI] Samsung P35, S3, black screen (radeon))
    Reseting a video card from suspend is essentially the same problem as
    reseting secondary video cards on boot. The same code can address both

    Some things to consider....

    1) With multiple video cards you have to ensure only a single VGA gets
    enabled. Running video reset on a card is going to turn on it's VGA
    emulation. So you have to ensure that VGA emulation on other cards is
    disabled first.

    2) I add the 'rom' parameter in sysfs so that you can get to the rom
    contents from a user space app. It's there to support running video
    reset code. "echo 1 >rom" to see the contents, it is not enabled by

    3) The user space reset programs have to be serialized because of the
    rule about only a single VGA at a time. Calling vm86 from kernel mode
    is not a good idea. Doing this in user space lets you have two reset
    programs, vm86 and emu86 for non-x86 machines.

    A starting place for a user space reset program:

    This thread talks about the VGA routing code:

    Jon Smirl
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      Last update: 2005-03-22 14:10    [W:0.020 / U:6.576 seconds]
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