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
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