Wrong DDC information for external monitor with i810

[Christoph Burghardt]

> If you try hard enough you can get the i810 driver to notice a 1280x768 mode
> that you setup with 915resolution. But the refresh rate will be wrong so the
> display will not lock. What I found was that X thinks the refresh rate 
> is 60Hz
> but the signal was really 52Hz.
> 
> You have to use the intel driver's modesetting branch from GIT  to allow
> 1280x768 mode to be used.

I've checked out the modesetting branch from git and after commenting out
the i830DumpBIOSToFile(ScrnInfoPtr pScrn) i could compile it successfully.

But it stopped with

Executing (ax == 0x5f01) BIOS call at i830_driver.c:617
(II) I810(0): BIOS Build: 2878
(==) I810(0): Device Presence: disabled.
(II) I810(0): Currently active displays on Pipe A:
(II) I810(0): 	CRT
(II) I810(0): No active displays on Pipe B.
(==) I810(0): Display is using Pipe A
(--) I810(0): Maximum frambuffer space: 61272 kByte
(--) I810(0): Maximum space available for video modes: 8000 kByte
(II) I810(0): I2C device "CRTDDC_A:ddc2" registered at address 0xA0.
(II) I810(0): I2C device "CRTDDC_A:ddc2" removed.
(II) I810(0): Printing probed modes for pipe 0

Fatal server error:
No modes found on either pipe