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    SubjectRe: OpenGL-based framebuffer concepts
    Ondrej Zajicek wrote:
    > On Wed, May 31, 2006 at 07:21:11AM +0800, Antonino A. Daplas wrote:
    >>> 2) To modify appropriate fbdev drivers to not do mode change at startup.
    >>> Fill fb_*_screeninfo with appropriate values for text mode instead.
    >> Most drivers do not change the mode at startup. Do not load fbcon, and
    >> you will retain your text mode even if a framebuffer is loaded.
    >
    > Yes, but i wrote about _using_ fbcon and fbdev without mode change.

    boot with fbcon=map:9 /* or any number greater than the number of fbdev's loaded */

    >
    >>> 3) (optional) To modify appropriate fbdev drivers to be able to switch
    >>> back from graphics mode to text mode.
    >> And a few drivers already do that, i810fb and rivafb. Load rivafb or i810fb,
    >> switch to graphics mode, unload, and you're back to text mode.
    >
    > I though about being able to explicitly change mode from graphics to text
    > (for example when fbdev-only X switch to fbcon) while using fbdev.

    This will require the following:

    1. a generic text mode framebuffer driver, ie, an fbdev version of vgacon
    2. a chipset driver that can fully restore VGA text mode.

    The framebuffer layer already has helper functions that will save and restore
    the standard VGA registers. It's the save/restore of extended registers that
    only the chipset driver know about which is lacking.

    Once the above 2 are satisfied, the infrastructure is already present that
    will do what you want.

    Tony
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