BBB Ubuntu HDMI Red and Blue Inverted in X Window


I’ve got a BBB running Ubuntu 13.04 on the eMMC connected to an HDMI monitor where I want to display a webpage hosted on the BBB. I’m do this by starting an X Server and then launching a broswer:

xinit &
DISPLAY=:0 chromium-browser

The page is displayed, but anything that should be blue is red, and everything red is blue. Green stays the same. If I use a terminal on the HDMI display by plugging a keyboard into the BBB the colours appear as they should, but I can’t get anything in X to look right.

I’ve tried Ubuntu 13.10 on another BBB and it had the same problem. I also tried the default Angstrom image and the desktop looked normal on that. I’ve tried all the supported resolutions for this monitor that I got from “xrandr -q” and they all had the same issues. I also tried another model monitor with the same issue. I tried Firefox as well and had the same issue.

parse-edid output:
Section “Monitor”

Block type: 2:0 3:fd

Block type: 2:0 3:fc

Identifier “HP 23tm”
VendorName “HWP”
ModelName “HP 23tm”

Block type: 2:0 3:fd

HorizSync 24-94
VertRefresh 50-76

Max dot clock (video bandwidth) 170 MHz

Block type: 2:0 3:fc

Block type: 2:0 3:ff

DPMS capabilities: Active off:yes Suspend:yes Standby:yes

Mode “1920x1080” # vfreq 60.000Hz, hfreq 67.500kHz
DotClock 148.500000
HTimings 1920 2008 2052 2200
VTimings 1080 1084 1089 1125
Flags “+HSync” “+VSync”

Block type: 2:0 3:fd

Block type: 2:0 3:fc

Block type: 2:0 3:ff


fbset output:
mode “1280x720”
geometry 1280 720 1280 720 16
timings 0 0 0 0 0 0 0
accel true
rgba 5/11,6/5,5/0,0/0

Seems this has happened to others:!searchin/beagleboard/bbb$20colors/beagleboard/l3VogAknB5Q/PBCHhZHzLeoJ

Any ideas on how to fix this, or suggestions on how to display a webpage on the HDMI without using X Windows?



Switch to 16 bit color wating for the rock solid fix.: add /etc/X11/xorg.conf

 Section "Screen"
     Identifier    "Default Screen"
     Monitor        "Configured Monitor"
     Device        "Configured Video Device"
     DefaultDepth    16
     SubSection "Display"
         Modes        "1280x1024" "1280x960" "1152x864" "1024x768" "832x624" "800x600" "720x400" "640x480"

W dniu środa, 15 stycznia 2014 23:39:01 UTC+1 użytkownik napisał:

Worked great, thanks!

Thanks !! I would never come up to that my self.
I toguht I’m the first one with that problem.

But why is it that seldom? Is something wrong with our BBB?
Or, are all the others color-blind?

Nothing is wrong with the BBB. Depending on the color mode, the pin out changes on the processor, colors get moved around… Check the processor documentation.


OK, thanks

I wonder that just that few people are complaining about that. There must be few more using Ubuntu+LXDE and I’m not sure the colors was right also in the Angstrom.