[Bug 21050] Radeon driver displays nothing on DVI-0, but works fine on DVI-1

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=21050





--- Comment #17 from Alex Deucher <agd5f at yahoo.com>  2009-04-06 11:50:34 PST ---
(In reply to comment #16)
> New information. I tried the hard-wired reduced blanking mode that worked on
> the sole DVI output of my R300 based card. It worked!
> 
> Looking at the logs, the only difference between the hard-wired mode, and the
> mode offered by the Xserver appears to be the Hsync setting: here's the
> relevant lines from the log:
> 
> (II) RADEON(0): Modeline "1920x1200R"x60.0  154.00  1920 1968 2000 2080  1200
> 1203 1209 1235 -hsync -vsync (74.0 kHz)
> (II) RADEON(0): Modeline "1920x1200"x60.0  154.00  1920 1968 2000 2080  1200
> 1203 1209 1235 +hsync -vsync (74.0 kHz)
> 
> So colour me confused.
> 

I wonder if it's a bug in your monitor's edid?  Maybe it actually prefers
-hsync.  Not sure why it would only have a problem on one encoder however. 
Does the hard-coded mode also work on the other (previously working) DVI port? 
FWIW, the 1920x1200 monitor I (Dell LCD), has the same preferred modeline in
it's edid, however, it works fine on either DVI port on my RV730 card.

For reference:
(II) RADEON(0): Supported additional Video Mode:
(II) RADEON(0): clock: 154.0 MHz   Image Size:  519 x 324 mm
(II) RADEON(0): h_active: 1920  h_sync: 1968  h_sync_end 2000 h_blank_end 2080
h_border: 0
(II) RADEON(0): v_active: 1200  v_sync: 1203  v_sync_end 1209 v_blanking: 1235
v_border: 0
(II) RADEON(0): Serial No: G283H8AD26FS
(II) RADEON(0): Monitor name: DELL 2408WFP
(II) RADEON(0): Ranges: V min: 56 V max: 76 Hz, H min: 30 H max: 83 kHz,
PixClock max 170 MHz
(II) RADEON(0): EDID (in hex):
(II) RADEON(0):         00ffffffffffff0010ac2aa053463632
(II) RADEON(0):         2a12010380342078eab325ac5130b426
(II) RADEON(0):         105054a54b008180a940714f01010101
(II) RADEON(0):         010101010101283c80a070b023403020
(II) RADEON(0):         360007442100001a000000ff00473238
(II) RADEON(0):         3348384144323646530a000000fc0044
(II) RADEON(0):         454c4c20323430385746500a000000fd
(II) RADEON(0):         00384c1e5311000a20202020202000fd


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