http://www.elinux.org/Beagleboard:BeagleBoneBlack_HDMI
On Thu, Oct 16, 2014 at 1:41 PM, <[email protected]> wrote: > Hi all, > > I am a novice on beaglebone black. I purchased new BBB. But I do not get > any display. I tried connecting to LG 22LH20R TV (1366X766p) and HP monitor > (1366x768p). On connection, it shows only "problem with HDMI cable. Please > check connection". > > Below is the log book of the processes I tried: > > I. > Process > 1) Connect the serial cable to your PC. > 2) Launch the terminal emulation SW and select the correct serial port. > 3) Connect the serial cable to the serial debug connector on the board. > 4) Connect the HDMI cable to the board and your display. > 5) Apply power to the board. > 6) You should see messages appear on the terminal. > 7) When the login prompt appears type root and hit enter. > 8) Type export XAUTHORITY=`ls /var/run/gdm/auth-for-root-*/database` and > hit enter. > 9) Type export DISPLAY=:0.0 and hit enter. > 10) Type xrandr --output HDMI-0 --mode 720x480 --rate 60. You can > substitute different resolutions and refresh rates if you like. Hit enter. > The resolution should change on the display. If you get the message > "xrandr: cannot find mode 1920x1080" where the 1920x1080 in this example is > the mode you selected, that means that the DRM driver did not select it as > an available resolution. > > II. > root@beaglebone:~# lightdm -d > [+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log > [+0.00s] DEBUG: Starting Light Display Manager 1.2.2, UID=0 PID=1214 > [+0.01s] DEBUG: Loaded configuration from /etc/lightdm/lightdm.conf > [+0.01s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager > [+0.02s] DEBUG: Using Xephyr for X servers > [+0.02s] DEBUG: Registered seat module xlocal > [+0.02s] DEBUG: Registered seat module xremote > [+0.03s] DEBUG: Adding default seat > [+0.03s] DEBUG: Starting seat > [+0.03s] DEBUG: Starting new display for automatic login as user debian > [+0.04s] DEBUG: Starting local X display > [+0.06s] DEBUG: Could not run plymouth --ping: Failed to execute child > process "plymouth" (No such file or directory) > [+0.06s] DEBUG: Using VT 7 > [+0.07s] DEBUG: Activating VT 7 > [+0.07s] WARNING: Error using VT_ACTIVATE 7 on /dev/console: Inappropriate > ioctl for device > [+0.07s] WARNING: Error using VT_WAITACTIVE 7 on /dev/console: > Inappropriate ioctl for device > [+0.08s] DEBUG: Logging to /var/log/lightdm/x-1.log > [+0.08s] DEBUG: Can't launch X server Xephyr, not found in path > [+0.09s] DEBUG: X server stopped > [+0.09s] DEBUG: Releasing VT 7 > [+0.09s] DEBUG: Display server stopped > [+0.09s] DEBUG: Stopping display > [+0.10s] DEBUG: Display stopped > [+0.10s] DEBUG: Stopping X local seat, failed to start a display > [+0.10s] DEBUG: Stopping seat > [+0.11s] DEBUG: Seat stopped > [+0.13s] DEBUG: Acquired bus name org.freedesktop.DisplayManager > Failed to use bus name org.freedesktop.DisplayManager, do you have > appropriate permissions? > > III. > sudo -i > echo FRAMEBUFFER=y > /etc/initramfs-tools/conf.d/splash > update-initramfs -u > exit > sudo reboot > > IV. > $cvt 1366 768 > Modeline "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 > -hsync +vsync > $xrandr --newmode "1366x768" 85.25 1368 1440 1576 1784 768 771 781 798 > -Hsync +Vsync > $xrandr --addmode VGA1 "1366x768" > $xrandr --output VGA1 --mode "1366x768" > > V. > xrandr -display :0.0 -q > xrandr -display :0.0 --output HDMI-0 --mode 1024x768 --rate 60 > > Can someone please help me out here? > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
