Re: X woes - can't set the correct resolution no matter what...

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On 7/12/07, Phil Meyer <pmeyer@xxxxxxxxxxxxxxxx> wrote:
> Valent Turkovic wrote:
> > Hi.
> >
> > I have Fedora Core 6 and by default it choose i810 driver for X for my
> > Intel 915 chip.
> > With i810 driver I had no problem using only my laptop screen - but when
> > I connected external 19" screen all hell broke loose :) to be a bit
> > poetic. or more to the point:
> > https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=238747
> >
> > In my comment #8 you can see that I changed to intel driver, but even
> > that still doesn't work like I expect.
> >
> > I need my external monitor running at it's full resolution of
> > 1280x1024 and desktop also at that resolution. I got desktop running
> > with 1280x1024 but only on a 1024x768 screen resolution
>
> It is probably not the driver, but your external monitor that has a problem.
>
> One of the things that most of the current video drivers do is ask the
> monitor for its EDID.  In this data, the monitor reports its max
> Horizontal avd Vertical scan rates.  Look in /var/log/Xorg.0.log for
> EDID.  Here is an example:
>
> (II) VESA(0): Year: 2006  Week: 0
> (II) VESA(0): EDID Version: 1.3
> (II) VESA(0): Digital Display Input
> (II) VESA(0): Max H-Image Size [cm]: horiz.: 37  vert.: 23
> (II) VESA(0): Gamma: 2.20
> (II) VESA(0): No DPMS capabilities specified; RGB/Color Display
> (II) VESA(0): First detailed timing is preferred mode
> (II) VESA(0): redX: 0.614 redY: 0.353   greenX: 0.321 greenY: 0.561
> (II) VESA(0): blueX: 0.152 blueY: 0.124   whiteX: 0.313 whiteY: 0.329
> (II) VESA(0): Manufacturer's mask: 0
> (II) VESA(0): Supported additional Video Mode:
> (II) VESA(0): clock: 162.0 MHz   Image Size:  367 x 230 mm
> (II) VESA(0): h_active: 1920  h_sync: 1968  h_sync_end 2000 h_blank_end
> 2160 h_border: 0
> (II) VESA(0): v_active: 1200  v_sync: 1201  v_sync_end 1204 v_blanking:
> 1250 v_border: 0
>
> If you scroll down through the log, you can see where all possible
> resolutions are gone through and it may even tell you why it decided on
> 1024x768.
>
> There are monitors that give bad data in the EDID (DDC).  For instance,
> the old version of the DELL 24" display was .1 (yes point 1) off, and
> therefore by default no driver would go above 1600x1200.  With that
> monitor it was necessary to tell the video driver to ignore the EDID
> data and simply do what was asked. :)
>
> Here is how that is done:
>
> Add values to the Monitor section that are at least capable of the
> resolution you need.
>
> Section "Monitor"
> ...
>         HorizSync    31.5 - 90.0
>         VertRefresh  60.0 - 60.0
> ...
>
> Now, in the screen section, tell it to ignore that part of the the EDID.
>
> Section "Screen"
> ...
>         Option      "ModeValidation" "NoMaxPClkCheck"
> ...
>
> Hope this may help ya.
>
> Good luck!

Thank you very much! I will try this out as soon as I get to work on monday.
Few days ago I tried something else; I switched from i810 to intel
driver in Xorg.conf and now when I boot up my laptop I get 1024x768 on
both my 15" laptop screen and external 19" Samsung LCD.

How can I setup so that I have my laptop running at 1024x768 and my
Samsung running at 1280x1024 resolution?

I would like to make external screen my default desktop when both of
them are attached but when I boot with only laptop screen then I would
(obviously) like that my laptop screen doesn't freak out and that it
know that it is now the main screen.

It this possible?

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