> Some monitors support DDC1 but not DDC2 and vice-versa.
> For our mga driver there are actually three DDC implementations: DDC1,
> DDC2 and DDCvbe. Each can be turned off separately in the "Monitor"
> Section of the config file, with one of:
> Option "noDDC1"
> Option "noDDC2"
> Option "noDDCvbe"
This is fascinating, I had always wondered why my Matrox G400 can't read any
DDC information from my Sony G500 (this gets confusing fast:).
The ATI card can read it fine, but the Matrox card doesn't see it at all.
Which of these three is the default? Which is likely to work if the default
isn't working?
Given the excerpts from the log below it looks like like it's using DDC2?
Should I try noDDC2 then?
(II) LoadModule: "ddc"
(II) Loading /usr/X11R6/lib/modules/libddc.a
(II) Module ddc: vendor="The XFree86 Project"
compiled for 4.2.1, module version = 1.0.0
ABI class: XFree86 Video Driver, version 0.5
...
(II) Loading sub module "ddc"
(II) LoadModule: "ddc"
(II) Reloading /usr/X11R6/lib/modules/libddc.a
(II) Loading sub module "i2c"
(II) LoadModule: "i2c"
(II) Loading /usr/X11R6/lib/modules/libi2c.a
(II) Module i2c: vendor="The XFree86 Project"
compiled for 4.2.1, module version = 1.2.0
ABI class: XFree86 Video Driver, version 0.5
(==) MGA(0): Write-combining range (0xe8000000,0x1000000)
(II) MGA(0): vgaHWGetIOBase: hwp->IOBase is 0x03d0, hwp->PIOOffset is 0x0000
(II) MGA(0): I2C bus "DDC" initialized.
(II) MGA(0): I2C device "DDC:ddc2" registered.
(II) MGA(0): I2C device "DDC:ddc2" removed.
(II) MGA(0): I2C Monitor info: (nil)
(II) MGA(0): end of I2C Monitor info
(--) MGA(0): No DDC signal
(II) MGA(0): DDC Monitor info: (nil)
(II) MGA(0): end of DDC Monitor info
--
greg
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