[Bug 296878] Re: Defaulting to 96 dpi rather than 133 dpi

[Bryce Harrington]

** Description changed:

  Binary package hint: xorg
  
  Running ubuntu intrepid on Acer Aspire One A110L. 
    ~$ uname -a
    Linux aa1 2.6.27-8-generic #1 SMP Thu Nov 6 17:33:54 UTC 2008 i686 GNU/Linux
  
  Xorg appears to be defaulting to a 96x96dpi screen resolution, resulting in fonts in the login screen to be too large. (true screen size is only ~195x113 mm, with 133x133dpi)
    ~$ xdpyinfo | grep -i dimension
      dimensions:    1024x600 pixels (271x159 millimeters)
  
  while the xorg.log shows that a screen resolution of 1024x600 and dimension of 195x113, with a dpi of 96x96 were determined. Those numbers don't match ; and the three pairs can never be correct all at the same time!
  (see attached xorg.log.default):
    (II) intel(0): Output LVDS using initial mode 1024x600
    (==) intel(0): DPI set to (96, 96)
    (II) intel(0): Setting screen physical size to 195 x 113
  
  
  After adding to xorg.conf (see attached xorg.conf.mod)
    DisplaySize 195 113 (to Monitor Section)
    Option "NoDDC" (to Device Section)
  and restarting X the font-size at login is now adequat, but xdpyinfo reports x and y dimensions each one smaller by 1 mm, which in itself is odd:
    ~$ xdpyinfo | grep -i dimension
      dimensions:    1024x600 pixels (270x158 millimeters)
  
  yet the xorg.log gives again the correct size of (195,113) but stating to have taken it from the config file, and also stating to have taken a DPI from the config file  - although it does NOT exist there - and giving it a wildly off value of 230 in one dimension.
  (see attached xorg.log.mod) :
    (II) intel(0): Output LVDS using initial mode 1024x600
    (**) intel(0): Display dimensions: (195, 113) mm
    (**) intel(0): DPI set to (133, 230)
  
  Again,the three pairs of data can never match!
  
  Not only Xorg is confused, but I am too.
+ 
+ [lspci]
+ 00:00.0 Host bridge [0600]: Intel Corporation Mobile 945GME Express Memory Controller Hub [8086:27ac] (rev 03)
+     	Subsystem: Acer Incorporated [ALI] Device [1025:015b]
+ 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GME Express Integrated Graphics Controller [8086:27ae] (rev 03)
+     	Subsystem: Acer Incorporated [ALI] Device [1025:015b]

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Defaulting to 96 dpi rather than 133 dpi
https://bugs.launchpad.net/bugs/296878
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