ok, the dpi does seem like nvidia is reporting some strange stuff although
the dimensions are ok (I mean I could really have a single wide monitor
xdpyinfo |grep -e "dimensions\|resolution"
dimensions: 2560x1024 pixels (372x271 millimeters)
resolution: 175x96 dots per inch
So I guess I'm now really confused about something. Is this a bug against
every single one of my other apps? Including mplayer? If I really did have
a non-square dpi, would all these apps really display things with an
incorrect aspect ratio? That seems pretty ugly.
The other thing I am confused about is, why in gods name is nvidia doing
this? Both monitors are at the same resolution and the total desktop really
is 2560x1024 but the physical size in *not* really 372x271 millimeters and
the dpi is not 175x96! Someone mentioned that they might be doing this do
fake out non-xinerama aware applications but I really don't understand how
this could be helping those apps at all. On the contrary it just seems like
if an app ever did use the dpi info (like xine) it would just cause that app
to display incorrectly. Isn't this fix for nvidia just a simple as setting
the dpi back to 96x96 (or whatever).
Lastly, I'm still a little confused about how I might use the DisplaySize in
my XF86Config. Isn't this a property of one of the two "Monitor" sections?
If so, one of my monitors already has this set and apparently it is being
ignored. I will try on both. Or, if I can put this into the "Device"
section and it works, won't it possibly screw up all my other apps? (I guess
I could just try these options out and see what happens)
My existing DisplaySize is set to 370 270. What exactly do these numbers
refer to? In what units?
>From: Siggi Langauf <siggi@...;
>To: Steve Salazar <eagsalazar@...;
>Subject: Re: [xine-user] xinerama aspect ratio of movies
>Date: Thu, 22 Apr 2004 07:53:26 +0200 (CEST)
>On Thu, 22 Apr 2004, Steve Salazar wrote:
> > Ok, I'll try you suggestion but I still can't figure out why all
> > apps, including mplayer, work fine. What would be wrong with my
> > setup that would be handled ok by mplayer but not xine?
>That's easy: Most apps just ignore the screen aspect ratio, assuming you
>have square pixels on your display. (That's roughly correct for most
>standard resolutions, except 1280x1024.)
>xine, however asks the X server for the exact screen dimensions, so it
>able to display videos in the correct aspect ratio (provided they have
>correct aspect ratio set; I have some 4:3 streams that claim to be DVB
>You can query that sreen information from your X server using
>This should give you (amone lots of other stuff) 2 lines like these for
>every attached display:
> dimensions: 1024x768 pixels (347x260 millimeters)
> resolution: 75x75 dots per inch
>My guess is your X server fakes some very odd values here to accomodate
>for software that is not multiscreen-aware. As Marcel mentioned, you can
>compensate for such effects by setting a DisplaySize that's faked in the
>opposite direction, however to get it really fixed, you should probably
>make a bug report to your XFree driver vendor...
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