i finally have a decent handle on interpreting and manipulating EDID information based on a couple threads here not that long ago, but i just ran into another curious problem. someone handed me a piece of video processing equipment that (allegedly) had decent EDID programmed into it, i hooked up my WUXGA laptop, started the X server, and what i got in the X server log was:
... (II) RADEON(0): I2C device "DVI-0:ddc2" registered at address 0xA0. (II) RADEON(0): EDID vendor "XXX", prod id 26 (II) RADEON(0): Using EDID range info for horizontal sync (II) RADEON(0): Using EDID range info for vertical refresh (II) RADEON(0): Printing DDC gathered Modelines: (II) RADEON(0): Modeline "1920x1200"x0.0 156.87 1920 1978 2010 2100 1200 1206 1212 1236 +hsync +vsync (74.7 kHz) (II) RADEON(0): Output: DVI-0, Detected Monitor Type: 3 (II) RADEON(0): EDID data from the display on output: DVI-0 ---------------------- (II) RADEON(0): Manufacturer: XXX Model: 1a Serial#: 0 (II) RADEON(0): Year: 2006 Week: 1 (II) RADEON(0): EDID Version: 1.3 (II) RADEON(0): Digital Display Input (II) RADEON(0): DFP 1.x compatible TMDS (II) RADEON(0): Indeterminate output size (II) RADEON(0): Gamma: 2.20 (II) RADEON(0): No DPMS capabilities specified(II) RADEON(0): Supported color encodings: RGB 4:4:4 YCrCb 4:4:4 (II) RADEON(0): First detailed timing is preferred mode (II) RADEON(0): GTF timings supported (II) RADEON(0): redX: 0.625 redY: 0.345 greenX: 0.350 greenY: 0.580 (II) RADEON(0): blueX: 0.140 blueY: 0.095 whiteX: 0.320 whiteY: 0.355 (II) RADEON(0): Manufacturer's mask: 0 (II) RADEON(0): Supported additional Video Mode: (II) RADEON(0): clock: 156.9 MHz Image Size: 0 x 0 mm (II) RADEON(0): h_active: 1920 h_sync: 1978 h_sync_end 2010 h_blank_end 2100 h_border: 0 (II) RADEON(0): v_active: 1200 v_sync: 1206 v_sync_end 1212 v_blanking: 1236 v_border: 0 ...
huh? the above looks a bit strange here:
(II) RADEON(0): Modeline "1920x1200"x0.0 156.87 1920 1978 2010 2100 1200 1206 1212 1236 +hsync +vsync (74.7 kHz)
"0.0"?? shouldn't that represent the refresh rate? is that a valid value? apparently, my laptop is refusing to generate a video signal on the DVI output because, perhaps, it doesn't like that value.
and then there's this:
(II) RADEON(0): clock: 156.9 MHz Image Size: 0 x 0 mm
"0 x 0 mm"?? i'm not sure what to make of that either, but i'm going to be handing this back to the person who programmed that piece of equipment and ask whether that information is supposed to be correct.
thoughts?
rday
On Sat, 01 Nov 2008 07:42:57 -0400 "Robert P. J. Day" rpjday@crashcourse.ca wrote:
"0 x 0 mm"?? i'm not sure what to make of that
Well, if it is a projector, there isn't any particular size they can say the image will be since that depends on how far you are away from the screen. Perhaps they just said 0 since there was no legitimate value to use?
Quoting Tom Horsley tom.horsley@att.net:
On Sat, 01 Nov 2008 07:42:57 -0400 "Robert P. J. Day" rpjday@crashcourse.ca wrote:
"0 x 0 mm"?? i'm not sure what to make of that
Well, if it is a projector, there isn't any particular size they can say the image will be since that depends on how far you are away from the screen. Perhaps they just said 0 since there was no legitimate value to use?
i was suspecting that, but it *appeared* that, perhaps given that returned value, that's why my laptop was refusing to send video out the DVI port. i was trying to drive a simple video signal to that piece of equipment, and the person manning it kept telling me that he wasn't getting any signal.
i can't do any further testing until he comes in today, but i've never had trouble sending video out the DVI port after activating it with "xrandr". and, yesterday, i did. or so the other party was claiming, as it was hard to verify as there was no actual display to view the image on.
i'll have to wait a bit to do any more testing. it's possible this is all a false alarm, but it was just a bit puzzling.
rday
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Robert P. J. Day -
Tom Horsley