HDMI output

[Andrij Senyk]

Hello,

I have BBB and waveshare 7 inch 1024x600 connected via HDMI and usb (touchscreen) plug on power and everything is ok.

When I change screen to DELL P2314T I have problem. If I disconnect HDMI plug power on and wait around 1 min until BBB loading and after that connect HDMI cable - everything in ok, but if I didnot disconnect HDMI result - black screen

How to fix it?

root@beaglebone:/# uname -a

Linux beaglebone 3.8.13-xenomai-r78 #1 Sat Sep 26 16:54:43 UTC 2015 armv7l GNU/Linux

root@beaglebone:/#

 

root@beaglebone:/# cat /proc/version

Linux version 3.8.13-xenomai-r78 (root@a6-imx6q-wandboard-2gb) (gcc version 4.6.3 (Debian 4.6.3-14) ) #1 Sat Sep 26 16:54:43 UTC 2015

root@beaglebone:/#

I try two different configuration for xorg

root@beaglebone:/# cat /etc/X11/xorg.conf

Section "Module"

        Load    "extmod"

        Load    "dbe"

        Load    "glx"

        Load    "freetype"

        Load    "type1"

        Load    "record"

        Load    "dri"

EndSection

Section "Monitor"                                                               $

        Identifier      "Builtin Default Monitor"

        HorizSync       31.5-75

        VertRefresh     60

EndSection

Section "Device"

        Identifier      "Builtin Default fbdev Device 0"

        Driver  "fbdev"

EndSection

Section "Screen"

        Identifier      "Builtin Default fbdev Screen 0"

        Device  "Builtin Default fbdev Device 0"

        Monitor "Builtin Default Monitor"

        DefaultDepth    24

        SubSection "Display"

                Depth   24

                Modes "1024x768_60.00"

        EndSubSection

EndSection

Section "ServerLayout"

        Identifier      "Builtin Default Layout"

        Screen  "Builtin Default fbdev Screen 0"

EndSection

root@beaglebone:/#

and 

root@beaglebone:/# cat /etc/X11/xorg.conf.default

Section "Monitor"

        Identifier      "Builtin Default Monitor"

EndSection

Section "Device"

        Identifier      "Builtin Default fbdev Device 0"

        Driver          "fbdev"

EndSection

Section "Screen"

        Identifier      "Builtin Default fbdev Screen 0"

        Device          "Builtin Default fbdev Device 0"

        Monitor         "Builtin Default Monitor"

        DefaultDepth    16

EndSection

Section "ServerLayout"

        Identifier      "Builtin Default Layout"

        Screen          "Builtin Default fbdev Screen 0"

EndSection

root@beaglebone:/#

but problem still same

How to fix it?