> A register dump [1] would be the easiest way to find out the exact timings,
OK, I'll ask a colleague to give this a try. The problem is to set up a machine 
that both runs the proprietary driver and a recent enough Debian to have 
libpciaccess available.

> but any standard 1600x1200 reduced-blanking mode should do it.
Yes, but having the exact same timings on the FB console and X11 results a 
smoother switch between the two modes.

> You could just use the same CVT reduced-blanking mode on both X and the
> framebuffer console.
Sorry for the apperantly dumb question, but how do tell X to use the CVT mode?

> Well, that works for me, can I have a look at your kernel logs?
Hm. I tried to reproduce the problem I faced on friday, but it disappeared. Now 
I get the "reduced blanking" message in the 
drm_fb_helper_connector_parse_command_line debug output. Strange.

Now I tried to give the modeline the drm debug output to xorg.conf, but it 
doesn't pick it up. I must be doing something stupidly wrong again:

[...]
Section "Monitor"
        Identifier      "Bildschirm"
        Option          "DPMS"
        ModeLine        "reduced"       130 1600 1648 1680 1760 1200 1203 1207 
1235
EndSection

Section "Screen"
[...]
        Monitor         "Bildschirm"
        DefaultDepth    24
        SubSection      "Display"
                Depth   24
                Virtual 1600 1200
                Modes   "reduced"
        EndSubSection
EndSection

Section "ServerLayout"
        Identifier      "Server"
        Screen          "Schrirm"
[...]
EndSection
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