On Mon, 2003-03-10 at 16:46, Benjamin Herrenschmidt wrote:

> The problem is that this "IVAD" cirtuit also controls the geometry
> and brightness of the screen, and should be configured properly after
> each mode setting. It has a EEPROM containing geometry settings for
> each of the supported modes, and upon mode change, we are supposed
> to "apply" the proper sets of geometry settings.

Just to make things clear, this "IVAD" chip is not the video chip,
it's controlling the CRT itself, but the machine uses a normal
video card (r128 of GeForceII MX in iMac's and eMacs respectively),
so the problem isn't hacking a video driver for that chip, but
havign a way to drive that motherboard-specific chip when the
video mode changes in one of those 2 drivers

Implementing a "hack" directly in the driver code is easy, ugly,
and not something that would be accepted upstream I beleive. However
I don't know XFree infrastructure well enough to find out a "clean"
way to hook on the mode change.

Ben.

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