I had some problems with some newer thin clients using ATI's X1200.
Xrandr didn't work, I got the same frequency error. The monitor sent
it's modeline correctly via DDC, but somehow it didn't work. For those
machines I disabled xrandr and used
[s550-09]
X_OPTION_01 = "\"DisplayPriority\" \"HIGH\""
(for radeon driver)
XRANDR_DISABLE = True
P24W5HACK = True
X_MODE_0 = 1920x1200
Btw, check out if you have a second monitor. Just login via ldm and
use xrandr -q. That's why I have sth like P24W5Hack in here.
2009/9/4 Gideon Romm <[email protected]>
>
> It is not uncommon, especially for monitors that do not reply to DDC
> probe requests from the driver, to end up causing the driver to pick a
> mode that is not well suited. In this case, the fix is usually to tell
> Xorg what horizontal and vertical sync frequencies are appropriate for
> that monitor.
>
> This is done in lts.conf with:
>
> X_HORZSYNC
> X_VERTREFRESH
>
> and example would be:
>
> X_HORZSYNC = 30-80
> X_VERTREFRESH = 55-75
>
> The exact appropriate values can be found on the data sheet for the
> monitor. However, if you are into guessing, you can try the values
> above and play with them. Alternatively, you can get a shell on the
> client and red the Xorg log file in /var/log on the client to find out
> what modes it rejected and why and what mode it put the driver into. If
> you know you want 60 Hz, you can also restrict the X_VERTREFRESH = 60 or
> 55-65 or some such.
>
> WARNING: With old CRT monitors, forcing incorrect sync frequencies
> could damage the monitor.
>
> With that said, the default/preferred means of setting *resolutions* and
> desired refresh rate and rotations, etc are with xrandr. The
> XRANDR_SIZE_0 is for drivers that do not support Xrandr1.2, and
> XRANDR_MODE_0 is for drivers that support Xrandr1.2.
> Xrandr will try to set the mode you specify and fall back on one of the
> known modes if it cannot.
>
> To absolutely, positively force Xorg to ONLY be aware of a SINGLE mode,
> you can use:
>
> XRANDR_DISABLE=True
> X_MODE_0 = <mode>
>
> where <mode> is a valid mode name that the driver knows.
>
> HTH,
>
> -Gadi
>
> On Fri, 2009-09-04 at 15:01 -0600, David Burgess wrote:
> > I've been reading through some recent threads on xranadr versus older
> > methods of setting screen resolution, but I can't seem to make any of
> > the recorded methods work on a cerain monitor.
> >
> > Ubuntu 9.04 x86_64
> > HP thin client
> > HP L1506 LCD monitor
> >
> > When I boot the tc with a vanilla lts.conf, all appears to go well
> > right up to the point where X should start. The screen goes black and
> > the monitor's OSD says "Input signal out of range. Change resolution
> > to 1024x...@60hz".
> >
> > So I tried combinations of the following in lts.conf:
> >
> > XRANDR_SIZE_0 = "1024x768"
> >
> > XRANDR_MODE_0 = "1024X768"
> >
> > XRANDR_DISABLE="True"
> > X_MODE_0="1024X768"
> >
> > I think I threw in some thing like VERTREFRESH=60 or something like
> > that at one point, but I lost track of that reference.
> >
> > So with any of the above, my 15" monitor still complains that the
> > signal is out of range. When I force those settings on a different 17"
> > monitor they are effective in an ldm or rdesktop login.
> >
> > I'm confused. Is the monitor telling xorg something that makes it
> > override my settings? Any thoughts?
> >
> > db
> >
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