Video driver seems to ignore modeline

[Philip Prindeville]

phong at phong.org wrote:

>I've got a Dell 2001FP LCD flat panel (native resolution 1600x1200) hooked up to
>a Radeon 7000 series card via DVI (lspci sez "0000:01:00.0 VGA compatible
>controller: ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE]").  After X
>has been started for a while (random amount of time), the image shifts to the
>right about half an inch, leaving a black space on the left and part of the
>image cut off on the right.  The problem only happens in Linux - never in
>Windows.  I investigated what timings were used by the Windows driver and found
>that they were indeed different than what the X driver was using.  So I added
>the following modeline, which is identical to the Windows timings, to the
>Monitor section of my xorg.conf:
>
>ModeLine "1600x1200-Dell"  162.00  1600 1672 1864 2160  1200 1201 1204 1250
>
>The problem is, when I start X, it seems to ignore that modeline and do its own
>thing.  Snippet from the log:
>
>-------------------------------------------------------------
>...
>(II) RADEON(0): DFP table revision: 3
>(II) RADEON(0): Panel infos found from DDC detailed: 1600x1200
>(II) RADEON(0): Valid Mode from Detailed timing table: 1600x1200
>(II) RADEON(0): Valid Mode from standard timing table: 1600x1200-Dell
>(II) RADEON(0): Total of 2 mode(s) found.
>(II) RADEON(0): Total number of valid DDC mode(s) found: 2
>(II) RADEON(0): Valid mode using on-chip RMX: 1600x1200-Dell
>(II) RADEON(0): Valid mode using on-chip RMX: 1400x1050
>(II) RADEON(0): Valid mode using on-chip RMX: 1280x1024
>(II) RADEON(0): Valid mode using on-chip RMX: 1152x864
>(II) RADEON(0): Valid mode using on-chip RMX: 1024x768
>(II) RADEON(0): Valid mode using on-chip RMX: 800x600
>(II) RADEON(0): Valid mode using on-chip RMX: 640x480
>(II) RADEON(0): Total number of valid FP mode(s) found: 7
>(--) RADEON(0): Virtual size is 1600x1200 (pitch 1600)
>(**) RADEON(0): *Mode "1600x1200-Dell": 162.0 MHz (scaled from 0.0 MHz), 75.0
>kHz, 60.0 Hz
>(II) RADEON(0): Modeline "1600x1200-Dell"  162.00  1600 1664 1856 2160  1200
>1201 1204 1250
>(**) RADEON(0): *Mode "1400x1050": 162.0 MHz (scaled from 0.0 MHz), 75.0 kHz,
>60.0 Hz
>(II) RADEON(0): Modeline "1400x1050"  162.00  1400 1664 1856 2160  1050 1201
>1204 1250
>...
>-------------------------------------------------------------
>
>I've tried both the "radeon" and "ati" drivers with the same effect.  I was able
>to confirm that my modeline fixes the problem by using xvidtune to tweak the
>timings after X has started.
>
>Is there any way to get it to honor my modeline?
>
>  
>

What happens if you add:

    Option "NoDDC"

to the Screen section of the config?

-Philip