FireMV 2200 vs CustomEDID

Csillag Kristof csillag.kristof at
Mon Oct 5 18:38:14 PDT 2009

Alex Deucher wrote:
> One problem is that the custom EDID you are using is grabbed from the
> analog vga cable from your monitor.
That was the only way, since DDC seems to be broken via DVI.

> As such it has the analog input set in the EDID:
> (II) RADEON(0): EDID data from the display on output: DVI-1
> ----------------------
> (II) RADEON(0): Manufacturer: SAM  Model: 1cf  Serial#: 1112683057
> (II) RADEON(0): Year: 2006  Week: 41
> (II) RADEON(0): EDID Version: 1.3
> (II) RADEON(0): Analog Display Input,  Input Voltage Level: 0.700/0.300 V
>                          ^^^^^^^^^^^^
> The driver uses this bit to decide whether to drive the monitor on A
> DVI-I port with the analog or digital transmitter.
Thank you for the explanation; I did not know the input
specification is inside the scope of the EDID info.
> To work properly using the digital transmitter you need to edit the
> EDID so it specifies a digital input.
I could probably do that, but if the user has to to this manually each time
to drive a DVI monitor using an analog-originated CustomEDID,
then this is way harder then it should be.
(This would kind of defeat the purpose of the CustomEDID option.)

Therefore, I have extended the syntax of the CustomEDID option to accept
commands after the EDID file name, and implemented one command ("digital")
to override this information in the EDID.

Then I have modified my  xorg.conf, so now it says this:

    Option    "CustomEDID"    "DVI-1:/etc/Samsung_214T.edid:digital"

According to the X log, this works as expected (the analog note disappeared)
 - but the display still stays blank.

Do you have any idea what am I doing wrong?
I am attaching the patch and the X log.

Thank you for your help, again:

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