[Bug 13786] vga16fb broken on some hardware.

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Ubuntu (installer) | linux





------- Additional Comments From thomas at winischhofer.net  2005-09-06 12:59 UTC -------
Don't know about radeon hardware, but with sis this works as follows: The chip
has 2 CRTCs, one for traditional VGA, one to which - in case of laptops - the
lcd panel is connected. The primary CRTC is VGA compatible. If you connect a
monitor to the VGA plug of such machines, you will see that vga16fb is working.
Second, for LCD: Most laptop panels come without a built-in scaler. Such panels
need to be programmed to their native mode and the output must be scaled to this
resolution. If this isn't done and the mode timing is changed, the LCD will go
havoc.

No idea how Windows does it, but I would very much assume that they use int10.

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