Cannot get DVI signal

[GoogleCodeExporter]

I have a BeagleBoard C4 and followed the build and setup instructions using the 
manifest rowboat-eclair.xml. Everything compiled just fine, Graphics SGX SDK 
installation went OK, sdcard with kernel and system image created successfully. 
When starting from sdcard:

Kernel is up and running, Android boots up but I cannot get any DVI ouput. In 
the kernel log I see this:

---------------------------------------------------------
[...]
<6>VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 1
<6>fbcvt: 1280x1024@60: CVT Name - 1.310M4-R
<4>regulator_init_complete: incomplete constraints, leaving VDVI on
<4>regulator_init_complete: incomplete constraints, leaving VDAC on
<4>drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
<3>omapdss DPI error: display already enabled
<4>omap_vout omap_vout: 'dvi' Display already enabled
<3>omapdss DPI error: display already enabled
<4>omap_vout omap_vout: 'dvi' Display already enabled
<6>omap_vout omap_vout: Buffer Size = 3686400
<6>omap_vout omap_vout: : registered and initialized video device 0
<6>omap_vout omap_vout: Buffer Size = 3686400
<6>omap_vout omap_vout: : registered and initialized video device 1
[...]
---------------------------------------------------------

I tried all the boot args below with no success.

---------------------------------------------------------
setenv bootargs 'mem=128M androidboot.console=ttyS2 console=tty0 
console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw init=/init rootwait 
omap-dss.def_disp=dvi omapfb.video_mode=720x480MR-16@60'

setenv bootargs 'mem=128M androidboot.console=ttyS2 console=tty0 
console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw init=/init rootwait 
omapfb.mode=dvi:1024x768MR-24@60 omapfb.vram=0:2M,1:4M'

setenv bootargs 'mem=128M androidboot.console=ttyS2 console=tty0 
console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw init=/init rootwait 
omapdss.def_disp=dvi omapfb.mode=dvi:1280x1024MR-16@60 vram=12M 
omapfb.vram=0:4M,1:4M,2:4M'
---------------------------------------------------------

The thing is that when in U-Boot mode, I can see the orange background (DVI) 
and the color bars in S-Video output but as soon as the kernel starts the DVI 
output goes black.

Have I missed anything? Is there any problem with the kernel or the DVI 
drivers? 

Original issue reported on code.google.com by Edfel...@gmail.com on 14 Oct 2010 at 7:52

[GoogleCodeExporter]

have the same problem ... any luck yet?

Original comment by Elres...@gmail.com on 4 May 2011 at 10:12

[GoogleCodeExporter]

iam also facing the same issue. please let me know if this is resolved

Original comment by satyalive@gmail.com on 24 Aug 2011 at 9:02