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Home > Archive > Cheap Linux Hardware > September 2007 > force video refresh
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force video refresh
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| I have some old 800mhz compaq machines with intel video cards set up for
publice access at the local library. I find after installing Ubuntu 7.04
and the new intel driver, that there are several light vertical lines in
the display at 1152x864 75hz, but that the display is rock solid at
1152x864 85hz. The login screen always comes up at 75hz, and I've added
'xrandr -r 85' to the .profile of the users so it comes up clean for them
once logged in.
Can anyone tell me how to force 85 hz for the login screen?
thanks
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| Martin Klar 2007-08-20, 1:39 pm |
| ray wrote:
> I have some old 800mhz compaq machines with intel video cards set up for
> publice access at the local library. I find after installing Ubuntu 7.04
> and the new intel driver, that there are several light vertical lines in
> the display at 1152x864 75hz, but that the display is rock solid at
> 1152x864 85hz. The login screen always comes up at 75hz, and I've added
> 'xrandr -r 85' to the .profile of the users so it comes up clean for them
> once logged in.
>
> Can anyone tell me how to force 85 hz for the login screen?
Add the output of
xvidtune -show (of a correct setup)
on top to your
/etc/X11/xorg.conf as Modeline in Section "Modes"
e.g,
[...]
Section "Modes"
Modeline "1152x864" 116.33 1152 1168 1384 1568 864 864 877 90
+hsync +vsync
[...]
your values may be different.
you also can comment out unwanted modes with #
HTH Martin
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| On Mon, 20 Aug 2007 19:13:06 +0200, Martin Klar wrote:
> ray wrote:
>
>
> Add the output of
> xvidtune -show (of a correct setup)
> on top to your
> /etc/X11/xorg.conf as Modeline in Section "Modes"
>
> e.g,
> [...]
> Section "Modes"
> Modeline "1152x864" 116.33 1152 1168 1384 1568 864 864 877 90
> +hsync +vsync
> [...]
>
> your values may be different.
>
> you also can comment out unwanted modes with #
>
> HTH Martin
Thanks, I'll give that a shot as soon as I can get over there again.
ray
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| On Mon, 20 Aug 2007 19:13:06 +0200, Martin Klar wrote:
> ray wrote:
>
>
> Add the output of
> xvidtune -show (of a correct setup)
> on top to your
> /etc/X11/xorg.conf as Modeline in Section "Modes"
>
> e.g,
> [...]
> Section "Modes"
> Modeline "1152x864" 116.33 1152 1168 1384 1568 864 864 877 90
> +hsync +vsync
> [...]
>
> your values may be different.
>
> you also can comment out unwanted modes with #
>
> HTH Martin
Solution turned out to be quite simple. I tried the modeline 'fix' but
could not get it to work. Simply set VertRefresh.
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