On Wednesday 14 July 2004 18:30, Warren Paul wrote:
> >> My question then Is what is X doing when
> >> it works it out, that I'm not doing when I tell it manually?
I think here's the important part of the two logfiles:
Working:
> (==) fglrx(0): TMDS coherent mode is enabled
> (WW) fglrx(0): Mode 1600x1200 is out of range.
> Valid mode should be between 320x200-1680x1050
> (II) fglrx(0): Total 0 valid mode(s) found.
Not working:
> (==) fglrx(0): TMDS coherent mode is enabled
> (II) fglrx(0): Valid mode using on-chip RMX: 1680x1050
> (II) fglrx(0): Valid mode using on-chip RMX: 1400x1050
> (II) fglrx(0): Valid mode using on-chip RMX: 1280x1024
> (II) fglrx(0): Valid mode using on-chip RMX: 1280x960
> (II) fglrx(0): Valid mode using on-chip RMX: 1024x768
> (II) fglrx(0): Valid mode using on-chip RMX: 800x600
> (II) fglrx(0): Valid mode using on-chip RMX: 640x480
> (II) fglrx(0): Total 7 valid mode(s) found.
> (--) fglrx(0): Virtual size is 1680x1050 (pitch 1728)
It looks like the TMDS mode checks for available modelines. For 1600x1200 it
cannot find any, so it starts using the modelines you provided. In the 2nd
try it _does_ find a working mode in its BIOS, so it doesn't look any further
at your configuration. From what I gathered about TMDS, it's an automatic
setup for XFree86:
TMDS coherent
Internal TMDS transmitter can be programmed in 2 different ways to get
best signal qualities depending on connected transmitter chips in the
panel. This noise most appears in 1600x1200 mode, but can also come up in
1280x1024x75 Hz. Use Option "TMDSCoherentMode" to enable ("on") or
disable ("off") coherent mode. Default setting is "on".
You might want to give the 1680x1050 setup another try after turning
TMDSCoherentMode to off. I'm interested to hear what your results will be.
Regards,
Pieter Hulshoff
_______________________________________________
XFree86 mailing list
XFree86@xxxxxxxxxxx
http://XFree86.Org/mailman/listinfo/xfree86
