[mythtv-users] Help With Mythbuntu Only Allowing 100x100dpi And Ignoring DisplaySize In xorg.conf?

Michael T. Dean mtdean at thirdcontact.com
Mon Dec 3 04:23:41 UTC 2007

On 12/02/2007 04:23 PM, Mario Limonciello wrote:
> Now you've got me intrigued:
> Michael T. Dean wrote:
>> Note, though, that 0.20-fixes still requires a 100x100dpi.  
> So what happens when you use other numbers instead?  Are you just talking about
> the picture/fonts etc won't look right?

Yep.  Fonts won't all be properly sized.  Some image elements may not
line up properly with fonts.  In many areas, though, you may not notice
a difference.

>> (If you have
>> non-square pixels, though, you're better off using <something>x100dpi,
>> so that is one place where you should change the DPI.)  If you have
>> square pixels, changing the DPI will make some parts (not all) of Myth
>> display incorrectly--i.e. don't complain about font sizes and
>> fonts/graphics not lining up :).
> So what exactly does it mean to have square pixels?

If you have a 16:9 display (i.e. the ratio of the physical length to the
physical height of the display is 16:9), the ratio of the pixel width to
the pixel height is also 16:9 (i.e. 1280x720 or 1920x1080).  Same
applies for 4:3 and 4:3, or 5:4 and 5:4, or 16:10 and 16:10, etc.

>   If you are using a
> resolution that is say on a 16:9 television set, would typically be wanting
> rectangular pixels?  How do you determine the <something>x100dpi that you
> would/should be using?


First explains the answer to your question.  Second and third are
additional (useful) information.


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