unblanking (A|D)-DVI order...

Alex Deucher alexdeucher at gmail.com
Fri Dec 22 13:44:42 PST 2006

On 12/22/06, Andrew Lunn <andrew at lunn.ch> wrote:
> Hi Folks
> X Window System Version 7.1.1
> (II) ATI: ATI driver (version 6.6.3) for chipsets: ati, ativga
> Its a Debian system using the debian Xorg packages.
> I have a Radeon 9200 PRO bases card which has a DVI and a VGA port. Im
> using it in mergedFB mode. That all works fine :-)
> On the DVI port i have a Philips 180P2 LCD monitor which supports DVI.
> On the VGA port i have a Philips 180B2, which is just plain old VGA.
> The DVI works great until the screen save kicks in and blanks the
> screens and then turns off the monitors. When i move the mouse, the
> monitor come back to life. The VGA screen is fine. The DVI screen
> however is not. It is showing a clone of the VGA screen. Using the
> menu's of the monitor i find it is showing the Analogue DVI input. If
> i change this to the Digital-DVI input i get the correct screen
> displayed.

Probably the monitor syncs to the DAC which is left active by the
bios.  If you try the radeon driver from git, you may have more luck
since it disables all outputs before enabling the active ones.


> My uneducated guess is that during unblanking the analogue DVI signal
> comes back to life first and the monitor sync to that. For some reason
> this is setup as a clone of the VGA signal. A little later the Digital
> DVI signal comes back to life, but the monitor already has a signal it
> likes and does not change to the digital one.
> There does not appear to be a way to configure the monitor to always
> use the Digital DVI. So, is it possible to disable the analogue DVI
> output from the card? I don't see anything about this in the radeon
> man page.
> Logs and configuration can be found at:
> http://www.lunn.ch/X11/xorg.conf
> http://www.lunn.ch/X11/Xorg.0.log
>         Thanks
>                 Andrew
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