[Openchrome-users] problem with Syncmaster wide monitor

[Alex Roitman]

Jelle,

Thanks for the help, I appreciate it.

I will try your suggestions when I get home tonight.
However, I have a few questions that may be coming
from my ignorance in this matter:

On Thu, 2007-09-27 at 22:40 +0200, Jelle de Jong wrote:
> execute the following command:
> gtf 1680 1050 60 -x
> 
> result: (remove the _60 part)
> Modeline "1680x1050"  147.14  1680 1784 1968 2256  1050 1051 1054 1087
> -HSync +Vsync

This looks good, *but* it seems that the max clock on this monitor is
140 Mhz, is that right? See this excerpt from the X log file:

> > ==============
> > (II) VIA(0): Supported Future Video Modes:
> > (II) VIA(0): #0: hsize: 1680  vsize 1050  refresh: 60  vid: 179
> > (II) VIA(0): #1: hsize: 1280  vsize 1024  refresh: 60  vid: 32897
> > (II) VIA(0): #2: hsize: 1280  vsize 960  refresh: 60  vid: 16513
> > (II) VIA(0): #3: hsize: 1152  vsize 864  refresh: 75  vid: 20337
> > (II) VIA(0): Supported additional Video Mode:
> > (II) VIA(0): clock: 119.0 MHz   Image Size:  474 x 296 mm
> > (II) VIA(0): h_active: 1680  h_sync: 1728  h_sync_end 1760 h_blank_end
> > 1840 h_border: 0
> > (II) VIA(0): v_active: 1050  v_sync: 1053  v_sync_end 1059 v_blanking:
> > 1080 v_border: 0
> > (II) VIA(0): Ranges: V min: 56  V max: 75 Hz, H min: 30  H max: 81 kHz,
> > PixClock max 140 MHz
> > ==============

Doesn't this mean I cannot run the higher clock?
This is surprizing, as the monitor is advertized to
support 1680x1050 at 60Hz. What am I missing here?

> Use the result in your monitor section: (change it with your modline)
> 
> Section "Monitor"
>         Identifier              "Generic Monitor"
>         Option                  "DPMS"
>         Modeline                "1440x900"  106.47  1440 1520 1672 1904
>  900 901 904 932  -HSync +Vsync
>         #gtf 1440 900 60 -x
>         #DisplaySize            381 238
>         #1024/96*25.4 and 768/96*25.4 =
>         DisplaySize             270.93 195.2
>         HorizSync               28-81
>         VertRefresh             56-75
> EndSection
> 
> Some extra commands that can help you solve problems:
> xdpyinfo | grep resolution
> xrdb -q | grep Xft
> sudo xresprobe via
> sudo ddcprobe
> gtf 1440 900 60 -x
> sudo ddcprobe | egrep '^[cd]*timing:' | sed -e 's/^[cd]*timing:
> \([^x]*\)x\([^ @$]*\).*$/\1x\2/;'
> grep -i dpi  /var/log/Xorg.0.log
> 
> 
> I hope it works, i will wait for some feedback :-D

I will report how this goes when I have tried it.

Thanks,
Alex