VESA display resume support (Re: cvs commit: src/sys/dev/fb vgareg.h src/sys/isa vga_isa.c)

From: Ian Dowse (iedowse_at_maths.tcd.ie)
Date: 02/28/05

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    To: current@freebsd.org, freebsd-mobile@freebsd.org
Date: Mon, 28 Feb 2005 21:17:06 +0000

    FYI, this and the previous commit to sys/i386/isa vesa.c may help
    notebooks displays that don't recover from a suspend/resume. You
    probably need to enable VESA support for it to make a difference,
    and may need to set hw.acpi.reset_video=0 also.

    Let me know if this causes any problems - due to the variety of
    VESA implementations out there, this may need a sysctl knob to
    disable it on problem hardware.

    Ian

    In message <200502282106.j1SL6EjM066161@repoman.freebsd.org>, Ian Dowse writes:
    >iedowse 2005-02-28 21:06:14 UTC
    >
    > FreeBSD src repository
    >
    > Modified files:
    > sys/dev/fb vgareg.h
    > sys/isa vga_isa.c
    > Log:
    > Save and restore the VGA state across a suspend-resume cycle. This
    > is particularly useful when VESA is available (either `options VESA'
    > or load the vesa module), as BIOSes in some notebooks may correctly
    > save and restore LCD panel settings using VESA in cases where calling
    > the video BIOS POST is not effective. On some systems it may also
    > be necessary to set the hw.acpi.reset_video sysctl to 0.
    >
    > Revision Changes Path
    > 1.8 +1 -0 src/sys/dev/fb/vgareg.h
    > 1.33 +55 -0 src/sys/isa/vga_isa.c
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