> > Why is the server changing my modeline?
> The ATI driver purposely does not allow changing the panel's dot clock.
> In addition, in a dual output situation (i.e. DFP and CRT), both outputs
> will always see the same timings (and image). Among other things, this
> means the CRT should sync to the same timings as the panel. If it
> doesn't, as is likely the case for 1400x1050 panels, you are limited to
> using only one output per X server invocation. And, for CRT-only, you
> need to specify Option "CRTScreen" in your XF86Config.
> The driver enforces these restrictions to avoid system lockups.
OK, I can live with the LCD and the CRT having the same timing. I'll
just set the resolution to 1280x1024, which both LCD and CRT can handle.
However, you say that the ATI driver doesn't allow changing the panel's
dot clock.
According to the XFree86.log:
(--) ATI(0): Panel clock is 107.859 MHz.
Fine, if it wants a dot clock of 107.859, I'll give it that dot clock in
XF86Config-4:
Modeline "1280x1024va" 107.859
1280 1328 1440 1688
1024 1025 1028 1066
+hsync +vsync
However, the driver still changes the timing parameters of the modeline:
(**) ATI(0): Mode "1280x1024va": 107.9 MHz, 58.4 kHz, 53.9 Hz
(II) ATI(0): Modeline "1280x1024va" 107.86 1280 1328 1456 1728 1024
1024 1027 1056 +hsync +vsync
I doublechecked the horizontal and vertical rates that my modeline
specifies to make sure it doesn't exceed the capabilities of the monitor:
107859 kHz / 1688 = 63.90 kHz
63900 Hz / 1066 = 59.94 Hz
This is within range of the monitor:
HorizSync 30-82
VertRefresh 50-75
So why is the ATI driver changing my modeline?
Thanks,
--Rob
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