Samsung SyncMaster 720N working only @60Hz

[Laszlo Kustan]

Hi Matthias,
Thanks for your reply.
Unfortunately none of the two modelines you provided work correctly. With
the first one I have 69 Hz and with the second one 75 Hz.
No matter what modeline I use, I have 60 Hz at startup and I can change with
xrandr to 75 Hz, which actually is only 69 Hz and this ain't confortable for
the eyes at all.
This is my xrandr -q output:
Screen 0: minimum 320 x 240, current 1280 x 1024, maximum 1280 x 1024
default connected 1280x1024+0+0 0mm x 0mm
   1280x1024      60.0     75.0*
   1280x960       60.0     63.0
   1152x864       75.0     70.0     65.0     60.0
   1024x768       75.0     70.0     60.0     65.0
   800x600        75.0     72.0     60.0     56.0     70.0     65.0
   1152x768       55.0
   832x624        75.0
   700x525        75.0     60.0
   640x512        75.0     60.0
   640x480        75.0     73.0     67.0     60.0
   720x400        70.0
   576x432        75.0
   576x384        55.0
   512x384        75.0     70.0     60.0
   416x312        75.0
   400x300        75.0     72.0     60.0     56.0
   320x240        75.0     73.0     60.0

The 75 Hz listed for 1024x768 is not 75 Hz in reality either. :(
Anything else I could try?
Thanks!

On Tue, Apr 8, 2008 at 1:56 PM, Matthias Hopf <mhopf at suse.de> wrote:

> On Apr 08, 08 13:42:12 +0300, Laszlo Kustan wrote:
> > This model isn't in the list of monitors,  I tried to set the horizontal
> and
> > vertical refresh ranges according to the monitor's manual:
> > Synchronization
> > Horizontal 30 ~ 81 kHz
> > Vertical 56 ~ 75 Hz
> > Resolution
> > Optimum resolution 1280 x 1024 at 60 Hz
> > Maximum resolution 1280 x 1024 at 75 Hz
> > Maximum Pixel Clock
> > 140 MHz
> >
> > I tried to generate modeline with the proper settings, but the generator
> > gives me only bad data (pixel clock too big)
> > This is the vesa preset from the manual:
> > VESA, 1280 x 1024 79.976 75.025 135.00 +/+
> > this is the modeline I tried:
> > Modeline "1280x1024" 135.00 1280 1296 1440 1688 1024 1025 1028 1066
> +HSync
> > +VSync
> > but it does not work.
>
> Where did you get this modeline from? This is neither conformant to GTF,
> nor to CVT. You should use the 'gtf' and 'cvt' tools to calculate
> modelines. E.g. you should try this one:
>
>  # 1280x1024 @ 75.00 Hz (GTF) hsync: 80.17 kHz; pclk: 138.54 MHz
>  Modeline "1280x1024"  138.54  1280 1368 1504 1728  1024 1025 1028 1069
>  -HSync +Vsync
>
> If that doesn't work, try a 72Hz one:
>
>  # 1280x1024 @ 72.00 Hz (GTF) hsync: 76.82 kHz; pclk: 132.75 MHz
>  Modeline "1280x1024"  132.75  1280 1368 1504 1728  1024 1025 1028 1067
>  -HSync +Vsync
>
>
> Also, if your driver is RandR capable, chances are high that your
> monitor section isn't used at all.
>
> Matthias
>
> --
> Matthias Hopf <mhopf at suse.de>      __        __   __
> Maxfeldstr. 5 / 90409 Nuernberg   (_   | |  (_   |__
> mat at mshopf.de
> Phone +49-911-74053-715           __)  |_|  __)  |__  R & D
> www.mshopf.de
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