> Hi everybody,
>
> I have a dual boot Fedora Core 6 on a box where the
> other OS is XP.
>
> The problem is that whenever I startx (or go into
> runlevel 5), the display is off centre. Too far to the
> right. So, I have to run xvidtune every time to align
> it.
>
> Is there anyway I can save these settings or automate
> the xvidtune settings. Keep in mind, I havn't done
> much with X since the switch over from xfree86, so I
> don't even know where the config files are these days.
>
> I could of course, fiddle with my projector's
> alignment and keystone options. But I shouldn't have
> to, right ?
>
> Besides, that puts my XP display off centre, and I
> don't know that XP has anything like xvidtune.
>
> Weird problem, eh ?
>
> -Manoj.C
Hi Manoj,
Sounds like different timings between your XP settings and your FC6 X
settings.
What resolution of display are you using? 1280x1024? 1024x768?
First, your x config file is /etc/X11/xorg.conf
There's only two reasons that spring to mind for the difference in
horizontal alignments of your display:
1> the vertical refresh (and hence horiz sync rates) are different
2> they are using different settings for the timing of the sync pulse
and the 'dead' space between the sync pulse and the video (known as
front porch and back porch).
<2> is unlikely because they are both probably using std vesa settings
for the durations of those parts of the vid signal.
That leaves vert refresh rate. you can try changing that by tuning your
xorg.conf to only allow certain vert refresh rates (in the monitor
section of the xorg.conf file). eg:
HorizSync 59.0 - 61.0
If you can't solve the issue with vert refresh rates, then you can
always tweak the timings of the front porch, sync pulse, and back porch
by creating your own mode(s) with modeline statements in xorg.conf. I
did this on a PC I have in my lounge for playing music - that one needed
an 852x480 mode for displaying on my TV, but since my vid driver needed
all numbers to be multiples of 8, I had to use an 848x480 mode. Here's
the relevant bits from my xorg.conf file:
------------------------------------
Section "Monitor"
Modeline "[EMAIL PROTECTED]" 34.02 848 864 992 1080 480 487 492 525
~
EndSection
Section "Screen"
DefaultDepth 24
SubSection "Display"
~
Depth 24
Modes "[EMAIL PROTECTED]" "640x480"
EndSubSection
EndSection
------------------------------------
I don't want to bore you and the whole group with explanations about
what each number do, but if you can't solve your problem with vert
refresh and want to go this route for tuning mode timings, then email me
off-list and we can discuss this over a pint and I'll run through what
the numbers mean and how to tune them to move your picture left/right on
the screen. It isn't that difficult...
If it were me, I'd probably solve this problem by not running XP....
BRgds,
PAUL
