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

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

[Chuanwen Wu]

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?

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.

Thanks in advanced!
-- 
wcw
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Re: [gentoo-user] how to bring down the sync range of your monitor?

[Iain Buchanan]

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.

> 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.

HTH!
-- 
Iain Buchanan <iaindb at netspace dot net dot au>

We question most of the mantras around here periodically, in case
you hadn't noticed.  :-)
             -- Larry Wall in <199705101952.MAA00756@wall.org>

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

[Chuanwen Wu]

2007/1/18, Iain Buchanan <iaindb@netspace.net.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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RE: [gentoo-user] how to bring down the sync range of your monitor?

[Nelson, David (ED, PAR&D)]

>-----Original Message-----
>From: Chuanwen Wu [mailto:wcw8410@gmail.com]
>Sent: 18 January 2007 14:37
>To: gentoo-user@lists.gentoo.org
>Subject: Re: [gentoo-user] how to bring down the sync range of your
>monitor?
>
>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

I'm not sure about for i810 but I know nVidia drivers can use this:

Option "IgnoreEDID" "True"

This ignores what the device says and uses your settings. You may want to look at the documentation and see if this (or something similar) is available for i810 chips.

djn


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

[Chuanwen Wu]

2007/1/18, Nelson, David (ED, PAR&D) <David.Nelson2@astrazeneca.com>:
> >-----Original Message-----
> >From: Chuanwen Wu [mailto:wcw8410@gmail.com]
> >Sent: 18 January 2007 14:37
> >To: gentoo-user@lists.gentoo.org
> >Subject: Re: [gentoo-user] how to bring down the sync range of your
> >monitor?
> >
> >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
>
> I'm not sure about for i810 but I know nVidia drivers can use this:
>
> Option "IgnoreEDID" "True"
You mean add this line to where?
I add it as below:

Section "Monitor"
    Option "IgnoreEDID" "True"
    Identifier  "My Monitor"
    HorizSync   30 - 60
    VertRefresh 75
EndSection

But still can't set to 75Hz...
> This ignores what the device says and uses your settings. You may want to look at the documentation and see if this (or something similar) is available for i810 chips.
>
> djn
>
>
> --
> gentoo-user@gentoo.org mailing list
>
>


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

[Etaoin Shrdlu]

On Friday 19 January 2007 05:16, Chuanwen Wu wrote:

> You mean add this line to where?

To your video driver options in the appropriate "Device" section.

> I add it as below:
>
> Section "Monitor"
>     Option "IgnoreEDID" "True"
>     Identifier  "My Monitor"
>     HorizSync   30 - 60
>     VertRefresh 75
> EndSection

No, see above. I'm not an expert, but maybe you can try putting

Option "DDC" "false"

in your video driver's "Device" section and see what happens.

However, for more info read the man page for the i810 driver:

http://ftp.x.org/pub/X11R7.0/doc/html/i810.4.html
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Re: [gentoo-user] how to bring down the sync range of your monitor?

[Chuanwen Wu]

2007/1/19, Etaoin Shrdlu <shrdlu@unlimitedmail.org>:
> On Friday 19 January 2007 05:16, Chuanwen Wu wrote:
>
> > You mean add this line to where?
>
> To your video driver options in the appropriate "Device" section.
>
> > I add it as below:
> >
> > Section "Monitor"
> >     Option "IgnoreEDID" "True"
> >     Identifier  "My Monitor"
> >     HorizSync   30 - 60
> >     VertRefresh 75
> > EndSection
>
> No, see above. I'm not an expert, but maybe you can try putting
>
> Option "DDC" "false"
Thank you!But from the man page,I know that this option is only for
i810 and i815 chips.
>
> in your video driver's "Device" section and see what happens.
>
> However, for more info read the man page for the i810 driver:
>
> http://ftp.x.org/pub/X11R7.0/doc/html/i810.4.html
> --
> gentoo-user@gentoo.org mailing list
>
>
My video card is 845G.In another machine which also has the 845G card
,everything is Ok!
I don't know  why?

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