Monitor Screen Keeps Shaking

[Soo-Hyun Choi]

Firstly, thanks for your reply. I use the screen setup like 1280x1024
with 60Hz under WinXP, and set the same resolution with 75Hz under
Ubuntu. But it is still wiggling and trembling. The following is part
of my xorg.conf file. Do you find any oddity here?

Thank you.

---------- <part of xorg.conf file> ---------- 

Section "Monitor"
        Identifier      "Philips 170S"
        HorizSync       30-82
        VertRefresh     56-76
        Option          "DPMS"
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Device          "ATI Technologies, Inc. Radeon 7000 VE (RV100 QY)"
        Monitor         "Philips 170S"
        DefaultDepth    24
        SubSection "Display"
                Depth           1
                Modes           "1280x1024" "1152x864" "1024x768"
"832x624" "800x600" "720x400" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           4
                Modes           "1280x1024" "1152x864" "1024x768"
"832x624" "800x600" "720x400" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           8
                Modes           "1280x1024" "1152x864" "1024x768"
"832x624" "800x600" "720x400" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           15
                Modes           "1280x1024" "1152x864" "1024x768"
"832x624" "800x600" "720x400" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           16
                Modes           "1280x1024" "1152x864" "1024x768"
"832x624" "800x600" "720x400" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           24
                Modes           "1280x1024" "1152x864" "1024x768"
"832x624" "800x600" "720x400" "640x480"
        EndSubSection
EndSection


On 9/7/05, Steve <bassix at gmail.com> wrote:
> On 9/7/05, Soo-Hyun Choi <shchoi at gmail.com> wrote:
> > Hi,
> >
> > I've got a machine for dual boot with WinXP and Ubuntu Hoary 5.04. If
> > I boot with WinXP, the screen just works perfect. My monitor is
> > Philips 170S (LCD screen), and VGA card is Radeon 7000 series.
> >
> > But if I boot with Ubuntu, the screen is keeping shaking and it's very
> > unstable. (i.e., the screen is keeping tiny trembling and flickering.)
> >
> > Because the screen just works perfect under WindowsXP with same screen
> > resolution, I don't think the problem is in the LCD monitor or the
> > graphic card.
> >
> > Did anyone have similar problem like me? and got any idea to sort this out?
> >
> > Thank you.
> 
> That is the refresh rate. It is probably a different frequency than
> when booting into XP. For me 75Hz "wiggles" slightly, but 85Hz is
> fine. Try changing Ubuntu to a resolution that uses a different
> (higher) refresh rate (mostly likely a lower resolution). If that
> fixes it, you'll have to modify your xorg.conf file to get the same
> resolution with refresh rate as you get in XP.
> 
> -Steve.
> --
> Ubuntu :: Linux for Human Beings :: ubuntulinux.org
> 
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