Re: Monitor not detecting Raspberry Pi (solved)

Azandrias · Fri Apr 27, 2012 3:10 pm

I have a monitor attached to the Raspberry Pi using a DVI to HDMI cable but the monitor remains on sleep mode. I've used win32diskimager to get the latest Debian image on my 16GB Kingston MicroSD Card in a SDHC adaptor and when it is set up the PWR and OK LEDs are on.

I've tried to use a config.txt on the root folder but it doesn't seem to work

Fri Apr 27, 2012 5:22 pm

Are you using latest Debian image?

Can you test with a different monitor to confirm your sdcard image is working?

Some monitors don't assert hdmi hotplug unless they are powered on. Can you ensure monitor is on and correct input is selected before booting pi?

Can you enable ssh and ssh in ? Then you could run tvservice and extract EDID.

Things to try in config.txt:

hdmi_force_hotplug=1

hdmi_drive=1

hdmi_group=1 (or try 2)

hdmi_mode=4

Azandrias · Fri Apr 27, 2012 10:36 pm

I am using debian6-19-04-2012.img from the downloads section of the site. The SHA-1 checksum was verified. I'm redownloading it from the torrent and if that doesnt work i'll try the other images on the downloads page.

Connecting it to my LCD TV using hdmi-hdmi cable yields a blank screen but both LEDs still are on; both the TV and the first monitor were on when i plugged the hdmi cables in.

I've tried changing the config.txt with your suggestions and the elinux wiki article but also to no avail...

I am not sure about enabling ssh since I have not used any linux platform before to any technical degree.

Tass · Fri Apr 27, 2012 10:57 pm

What is your Pi doing? What lights are on?

Azandrias · Fri Apr 27, 2012 11:01 pm

The PWR light is on and solid and the OK flashes as it reads from the SD card I think.

Azandrias · Sat Apr 28, 2012 10:25 am

Problem solved. HDMI cable was too long; "config_hdmi_boost=4" in config.txt solved the issue.

Sat Apr 28, 2012 10:43 am

Great news!

If you have time, it might be worth checking the Wiki, and if your particular problem isn't referenced, adding you own section to explain the problem and the solution, or perhaps adding more information to a section on a similar topic.

Colly · Mon Jul 30, 2012 11:50 pm

I had this same problem, but I tried a second, very small 7" HDMI monitor and it DID work, so then I checked my big monitor's settings and discovered it was set fixed to DVI instead of AUTO.
I changed the big monitor's setting to AUTO and the next time I started the Pi, the monitor worked just fine. I'm using a 3 foot HDMI cable, and needed no changes to the Pi configuration.
Except now I need to change my keyboard to US, but I saw that in a different thread.