output over monitor hdmi/dvid not working

[Sanat Sarda]

Hi,

I have been using 2 pandboards with ubuntu 12.04 arm+omap4 image. Till now the output over monitor using hdmi/dvid were working. Apparently now, for of the 2 boards, the monitor does not show any display over hdmi/dvid. The other board is working fine. I have tried swapping monitors, SD cards but still there is not output over monitor.

Can anyone help me troubleshoot this ?

Thanks,

Sanat

[Xavier Boudet]

Sorry but problem description is not clear.

I understand that you have 2 pandaboards and one stops working.
If you re-use the SD Card + monitor from the working pandaboard on the failing one, you still have no output on monitor?
Are you using same cables also between the 2 boards?
Can you send the dmesg output + lsmod on the failing board?
Are the 2 pandaboards identical?
Can you confirm that your bootargs looks like this:

ro elevator=noop console=ttyO2,115200n8 mem=1G@0x80000000 root=<UUID or LABEL root> fixrtc splash

In fact, ensure that you don't ahave anymore " vram=40M mem=456M@0x80000000 mem=512M@0xA0000000"

Regards, Xavier Boudet

[Xavier Boudet]

You can configure a console on the UART to collect the kernel boot traces:
http://omappedia.org/wiki/Ubuntu_on_OMAP_FAQ#I_want_to_see_the_kernel_debug_traces_and_connect_through_a_serial_connection

Regards, Xavier Boudet

On 12/11/2012 08:59 AM, sanat...@gmail.com wrote:

Pardon for the delayed reply. I have 2 identical pandaboards, both installed with ARM-OMAP Ubuntu 12.04. Each of the boards have their separate monitors. Boards are not connected which each other. They use same monitors, 8g SD cards, cables ( DVID) all identical and was running same programs on both boards. One pandaboard apparently stop showing the display over its monitor. I swapped the cards, cables, monitors but it does not show any display on the monitor. The other board was working fine. 

I cannot send you output for dmesg +lsmod as there is no display. I ll check if there is a workaround.

Now my current problem is, the one board that was working, fear is fired. On this board I had installed Codezero hyper visor (bare metal/ removing the earlier Ubuntu) and two android OS 4.05, one over each core. It ran successfully once and now its not able to . Infact the LED D2 just blinks once and there is no display even. The POP memory/OMAPprocessor chip on board becomes hot than usual. 

So one board has a display problem and other board just does not do anything ( even after trying to boot the earlier Ubuntu over it).