Re: [gentoo-user] how to bring down the sync range of your monitor?

[Chuanwen Wu]

2007/1/18, Iain Buchanan <iaindb@××××××××××××.au>:
> On Wed, 2007-01-17 at 22:46 +0800, Chuanwen Wu wrote:
> > I find my monitor work correctly in the 85Hz(the character is
> > vague).And in windows,I set the sync range to 75Hz and then it's OK.
> > But how to bring down the sync range to 75Hz in gentoo?
>
> the monitor frequency you see in windows is "VertRefresh" from
> xorg.conf.  You don't have to specify a range, you can also give a
> discrete value.
Thanks!I have tried.But still all the same.Here is a part of my xorg.conf:

  HorizSync   30 - 60
    VertRefresh 75 - 75

#add by myself
Section "Modes"
    Identifier   "Modes[0]"
    # 1024x768 @ 75.00 Hz (GTF) hsync: 60.15 kHz; pclk: 81.80 MHz
    Modeline "1024x768_75.00"  81.80  1024 1080 1192 1360  768 769 772
802  -HSync +Vsync
EndSection

Section "Screen"
    Identifier  "Screen 1"
    Device      "** Intel i810 (generic)               [i810]"
    Monitor     "My Monitor"
    DefaultDepth 24

    Subsection "Display"
        Depth       8
        Modes       "1024x768_75.00"
        ViewPort    0 0
    EndSubsection
    Subsection "Display"
        Depth       16
        Modes       "1024x768_75.00"
        ViewPort    0 0
    EndSubsection
    Subsection "Display"
        Depth       24
        Modes       "1024x768_75.00"
        ViewPort    0 0
    EndSubsection
EndSection

And I used gtf:

#gtf 1024 768 75
 # 1024x768 @ 75.00 Hz (GTF) hsync: 60.15 kHz; pclk: 81.80 MHz
  Modeline "1024x768_75.00"  81.80  1024 1080 1192 1360  768 769 772
802  -HSync +Vsync


>
> > Now in my xorg.conf:
> >
> >  HorizSync   31.5 - 57.0
> >  VertRefresh 50-90
> >
> > Even I change them to 20 - 40(HorizSync)  and 30 - 60(VertRefresh),the
> >  frequency is still 85Hz.
>
> be careful just randomly changing these values - you can sometimes to
> bad things to your monitor.
>
> To stop this, X probes your monitor (if it supports EDID) to get the
> refresh and sync values it can display, and it won't let you set the
> value outside this.
>
> I would troll through /var/log/Xorg.0.log and see if you can see
> anything interesting about EDID or sync, etc.
And I also found information in Xorg.0.log:

II) I810(0): Supported VESA Video Modes:
(II) I810(0): 720x400@70Hz
(II) I810(0): 720x400@88Hz
(II) I810(0): 640x480@60Hz
(II) I810(0): 640x480@67Hz
(II) I810(0): 640x480@72Hz
(II) I810(0): 640x480@75Hz
(II) I810(0): 800x600@56Hz
(II) I810(0): 800x600@60Hz
(II) I810(0): 800x600@72Hz
(II) I810(0): 800x600@75Hz
(II) I810(0): 832x624@75Hz
(II) I810(0): 1024x768@87Hz (interlaced)
(II) I810(0): 1024x768@60Hz
(II) I810(0): 1024x768@70Hz
(II) I810(0): 1024x768@75Hz
(II) I810(0): Manufacturer's mask: 0
(II) I810(0): Supported Future Video Modes:
(II) I810(0): #0: hsize: 800  vsize 600  refresh: 85  vid: 22853
(II) I810(0): #1: hsize: 640  vsize 480  refresh: 85  vid: 22833
(II) I810(0): #2: hsize: 1024  vsize 768  refresh: 85  vid: 22881
(II) I810(0): #3: hsize: 1280  vsize 1024  refresh: 60  vid: 32897
(II) I810(0): Ranges: V min: 50  V max: 130 Hz, H min: 30  H max: 72
kHz, PixClock max 110 MHz
(II) I810(0): Monitor name: 1772ED
(II) I810(0): Serial No: 1249407921234
(II) I810(0): Will use BIOS call 0x5f05 to set refresh rates for CRTs.
(--) I810(0): Maximum space available for video modes: 8000 kByte
(II) I810(0): Using detected DDC timings
(II) I810(0):   HorizSync 30-72
(II) I810(0):   VertRefresh 50-130

Obviously,the system detected the frequency itself and my setting of
HorizSync and VertRefresh have no effect.

So is there anything wrong with my xorg.conf?How to change it?
-- 
wcw
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