On Fri, 10 Jan 2003, Javier Kohen wrote: > Regarding: Incorrect DPI calculation
> (II) MGA(0): I2C bus "DDC" initialized. > (II) MGA(0): I2C device "DDC:ddc2" registered. > (II) MGA(0): I2C device "DDC:ddc2" removed. > (II) MGA(0): I2C Monitor info: (nil) > (II) MGA(0): end of I2C Monitor info > > (--) MGA(0): No DDC signal > (II) MGA(0): DDC Monitor info: (nil) > (II) MGA(0): end of DDC Monitor info > (**) MGA(0): Display dimensions: (524, 392) mm > (**) MGA(0): DPI set to (99, 99) > Repeat By: > > Set ScreenSize option in the Monitor section of the configuration. > Aditionally define a Display subsection in your Screen section > containing at least one entry in the Modes line (eg. 1024x768) and a > Virtual configuration bigger than zero and different from the above > resolution. > The DPI will be calculated from the Virtual screen size where, what > matters here IMO, is the actual screen resolution. > That is, given these -cut down to a minimum- settings: > Section "Monitor" > DisplaySize 262 196 > EndSection > Section "Screen" > Subsection "Display" > Modes "1024x768" > Virtual 2048 1536 > EndSubsection > EndSection > > I get the following output from xdpyinfo: > dimensions: 2048x1536 pixels (263x196 millimeters) > resolution: 198x199 dots per inch > > Where it's clear the resolution should be just half that. True, but you could have: > Section "Screen" > Subsection "Display" > Modes "1024x768" > Modes "800x600" > Modes "640x480" > Virtual 2048 1536 > EndSubsection > EndSection so that you can use <ctl><alt><keypad+> and <ctl><alt><keypad-> to cycle through the modes. Unfortunately the dpi doesn't change when you switch modes, so which size should we use to calculate dpi ? By using interlace and multiplying up the horizontal timing, I can get my 1280x1024 CRT monitor to display a 2048x1536 picture - several pixels get averaged together, but for an overview of the virtual desktop that is fine. However it isn't comfortable for continuous use, so although I have a section like: > Section "Screen" > Subsection "Display" > Modes "1280x1024" > Modes "1024x768" > Modes "800x600" > Modes "640x480" > Modes "2048x1536" > Virtual 2048 1536 > EndSubsection > EndSection I want X to calculate the dpi from the mode I use most (1280x1024). So I wouldn't be any happier if the dpi was calculated from the largest Modes instead of the Virtual size. -- Dr. Andrew C. Aitchison Computer Officer, DPMMS, Cambridge [EMAIL PROTECTED] http://www.dpmms.cam.ac.uk/~werdna _______________________________________________ XFree86 mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xfree86
