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I have set up an old machine with Arch connectected to my livingroom TV. It has a Radeon 9600 graphic card, using the DVI connection to the HDMI input on the TV. The TV is a Samsung 43" 16:9 plasma with a naitive resolution of 1024x768, its pixels are rectangular. I have some trouble getting this as i want in xorg. I am not using any login manager, just doing startx in my .profile and starting IceWm from my .xinitrc, so there is no gdm, kdm or whatever doing things.
I want to run its naitive resolution 1024x768 stretched to the 16:9 format, and be able to either change resoluton or preferably zoom to lower res. like 800x600 with ctrl-alt-numpad-plus/minus. The folks over at mythtv.org have some howtos about important parts of this, but none of those involving xorg modelines, DisplaySize, DPI, and Virtual settings works in my setup, and i cannot figure out why.
With either the radeon or ati driver specified in xorg.conf i gat the following:
*ctrl-alt-numpad-plus/minus to zoom or change res. do not work.
*Resolution forced to 96x96 DPI no matter what i do.
*At 1024x576 the screen is initially OK but if i toggle to whatch TV and then back to hdmi/dvi top and bottom of the computer image goes out of screen.
*At 1280x720 the top and bottom goes out of screen.
*1360x768 works, but this makes things a bit too small and text a bit hard to read and this old machine gets into trouble when going full screen looking at some video on the web, a bit much to interpolate.
*Set at the monitor naitive 4:3 resolution 1024x768 i am happy with the size of things, but the image gets stretched horisontally, circles get oval and everything looks fat.
The options DisplaySize, DPI, and Virtual do not work at all, they somehow get ignored with the ati or radeon driver.
If i change to the vesa driver it defaults to 1024x768 when i try to set a 16:9 res, but with this driver the zooming to lower res. with ctrl-alt-numpad-plus/minus do work like it should. With the vesa driver the options DisplaySize and DPI do seem to work according to xdpyinfo, but nothing really changes on screen. If i set DisplaySize 347 195 (16:9 res) running a 4:3 res. the image do not change in any way, just the resolution numbers in xdpyinfo.
So, how can i fix this?
Last edited by steelneck (2012-09-20 23:45:06)
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Does it work if you specify your DPI in startx like:
startx -- -dpi 96Offline
Does it work if you specify your DPI in startx like:
startx -- -dpi 96
Nope, first i do not want the same DPI both vertical and horizontal, rather something like 100 133, i need lower horisontal DPI than vertical since the monitor has rectangular pixels, and second both the ati and radeon drivers set 96 DPI no matter what. Illogical since 1024x768 vs. 800x600 on the same monitor _are_ different resolutions.
Last edited by steelneck (2012-09-21 00:55:44)
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