allcardr
Posts: 26
Joined: Sun Feb 26, 2012 8:09 pm

HDMI to DVI not working on Acer monitor

Fri May 25, 2012 4:21 pm

OK , I just received my Pi, works well on Composite cable to TV ( TV doesn't have HDMI) But when I try to boot using a HDMI to DVD-D cable connected to my monitor, I got no picture whatsoever. Any help would be appreciated.

dom
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 6062
Joined: Wed Aug 17, 2011 7:41 pm
Location: Cambridge

Re: HDMI to DVI not working on Acer monitor

Fri May 25, 2012 4:38 pm

There's useful information here:
http://elinux.org/R-Pi_Troubleshooting

If you can connect in (e.g. with ssh over network), dumping your EDID could be illuminating:
/opt/vc/bin/tvservice -d edid.dat

and post the edid.dat here.

allcardr
Posts: 26
Joined: Sun Feb 26, 2012 8:09 pm

Re: HDMI to DVI not working on Acer monitor

Fri May 25, 2012 4:47 pm

Had a look at the link, nothing really there to answer thi issue, As for SSh into teh pi, well that's not possible ATM as the TV connection I have is too far away to allow me to set up either wireless or cable Ethernet connectiojn (IE get the Pi online /Networked!)
So would I beed to edid the conf file for HDMI options ?

allcardr
Posts: 26
Joined: Sun Feb 26, 2012 8:09 pm

Re: HDMI to DVI not working on Acer monitor

Fri May 25, 2012 9:41 pm

Silly question, I've edited the conf.txt file as shown, but I'm still getting no joy,
Is there a difference in teh type of HDMI to DVI cables? IE, is there a separate type of cable from HDMI to DVI to one for DVI to HDMI?
it's a brand new cable, so I cannot see how I'm going wrong here!

Help!
#preset by the distro, everything below arm freq is edited by me
arm_freq=800
# Set stdv mode to PAL (as used in Europe)
sdtv_mode=2
# Force the monitor to HDMI mode so that sound will be sent over HDMI cable
hdmi_drive=1
# Set monitor mode to DMT
hdmi_group=1
hdmi_mode=1

allcardr
Posts: 26
Joined: Sun Feb 26, 2012 8:09 pm

Re: HDMI to DVI not working on Acer monitor

Sat May 26, 2012 5:08 pm

bumping this as i've still got issues here even after following all the advice on the config.txt file with still no joy. As suggested, lmay need to ssh into the piwhen connected so as to get the edid output file. how do I get the ip address of the pi once on my network?

dom
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 6062
Joined: Wed Aug 17, 2011 7:41 pm
Location: Cambridge

Re: HDMI to DVI not working on Acer monitor

Sat May 26, 2012 5:18 pm

You should be able to log into your router and see a list of connected devices.
You can also run a network scanner (I use LAN Scan on iPhone) to see devices on your local network.

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grumpyoldgit
Posts: 1452
Joined: Thu Jan 05, 2012 12:20 pm

Re: HDMI to DVI not working on Acer monitor

Sat May 26, 2012 5:20 pm

A quick, simple way is to log into your router and look at the lan information. The DHCP server in your router will have allocated an address to the Pi and logged it.

allcardr
Posts: 26
Joined: Sun Feb 26, 2012 8:09 pm

Re: HDMI to DVI not working on Acer monitor

Sat May 26, 2012 5:21 pm

thanks,Dom, I shall try that & post the output of the edid.

allcardr
Posts: 26
Joined: Sun Feb 26, 2012 8:09 pm

Re: HDMI to DVI not working on Acer monitor

Sat May 26, 2012 5:53 pm

Managed to ssh into the pi, all ok, ran the command /opt/vc/bin/tvservice -d edid.dat,
Now I've found the file, and when I try to vi edid.dat, I get command not found. I'm running raspbrian, so not sure what editors are available.

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piglet
Posts: 946
Joined: Sat Aug 27, 2011 1:16 pm

Re: HDMI to DVI not working on Acer monitor

Sat May 26, 2012 6:09 pm

Aha! I'd not seen this thread. I have the same problem (my post is here http://www.raspberrypi.org/phpBB3/viewt ... =26&t=6631 ) - you're not using a "Pluscom" cable by any chance are you?

My pi works fine with an HDMI cable, but with this HDMI to DVI-D monitors don't appear to get any signal at all.

allcardr
Posts: 26
Joined: Sun Feb 26, 2012 8:09 pm

Re: HDMI to DVI not working on Acer monitor

Sat May 26, 2012 6:13 pm

I'm using a Belkin HDMI to DVI-D cable from Currys, If this is the issue then It's going back to them for a refund !

allcardr
Posts: 26
Joined: Sun Feb 26, 2012 8:09 pm

Re: HDMI to DVI not working on Acer monitor

Sat May 26, 2012 6:33 pm

OK, tried opening the file with Editor, but the file is garbled. Any clues guys? I'm really struggling ! Sorry to be a pain and all,

superbantam
Posts: 7
Joined: Sat May 26, 2012 7:03 pm

Re: HDMI to DVI not working on Acer monitor

Sat May 26, 2012 7:10 pm

allcardr wrote:I'm using a Belkin HDMI to DVI-D cable from Currys, If this is the issue then It's going back to them for a refund !
Sorry I can't help more but I can tell you that I'm getting the same issue with 2 different dvi-d monitors (samsung/medion) and 2 different cables (ebay generic/asda). So I think the issue might not be cables.

milhouse
Posts: 642
Joined: Mon Jan 16, 2012 12:59 pm

Re: HDMI to DVI not working on Acer monitor

Sat May 26, 2012 7:21 pm

allcardr wrote:Managed to ssh into the pi, all ok, ran the command /opt/vc/bin/tvservice -d edid.dat,
Now I've found the file, and when I try to vi edid.dat, I get command not found. I'm running raspbrian, so not sure what editors are available.
"aptitude update; aptitude install vim" to get vi.
allcardr wrote:OK, tried opening the file with Editor, but the file is garbled. Any clues guys? I'm really struggling ! Sorry to be a pain and all,
It's a binary file, so not something you can edit with a text editor. To view the "contents" of edid.dat, you need to run edidparser:

Code: Select all

/opt/vc/bin/edidparser edid.dat
Now that you have it, why not attach the edid.dat file to this thread as dom requested.

allcardr
Posts: 26
Joined: Sun Feb 26, 2012 8:09 pm

Re: HDMI to DVI not working on Acer monitor

Sat May 26, 2012 7:35 pm

Got the edid.dat file parsed.. here it is,,


HDMI:EDID version 1.3, 0 extensions, screen size 38x30 cm
HDMI:EDID features - videodef 0x80 !standby !suspend active off; colour encoding:RGB444|YCbCr422; sRGB is not default colourspace; preferred format is native; does not support GTF
HDMI:EDID found monitor S/N descriptor tag 0xff
HDMI:EDID found monitor range descriptor tag 0xfd
HDMI:EDID monitor range offsets: V min=0, V max=0, H min=0, H max=0
HDMI:EDID monitor range: vertical is 55-75 Hz, horizontal is 30-83 kHz, max pixel clock is 140 MHz
HDMI:EDID monitor range does not support GTF
HDMI:EDID found monitor name descriptor tag 0xfc
HDMI:EDID monitor name is Acer_AL1921
HDMI:EDID found preferred DMT detail timing format: 1280x1024p @ 60 Hz (35)
HDMI:EDID established timing I/II bytes are BF EF 00
HDMI:EDID found DMT format: code 4, 640x480p @ 60 Hz in established timing I/II
HDMI:EDID found DMT format: code 5, 640x480p @ 72 Hz in established timing I/II
HDMI:EDID found DMT format: code 6, 640x480p @ 75 Hz in established timing I/II
HDMI:EDID found DMT format: code 8, 800x600p @ 56 Hz in established timing I/II
HDMI:EDID found DMT format: code 9, 800x600p @ 60 Hz in established timing I/II
HDMI:EDID found DMT format: code 10, 800x600p @ 72 Hz in established timing I/II
HDMI:EDID found DMT format: code 11, 800x600p @ 75 Hz in established timing I/II
HDMI:EDID found DMT format: code 16, 1024x768p @ 60 Hz in established timing I/II
HDMI:EDID found DMT format: code 17, 1024x768p @ 70 Hz in established timing I/II
HDMI:EDID found DMT format: code 18, 1024x768p @ 75 Hz in established timing I/II
HDMI:EDID found DMT format: code 36, 1280x1024p @ 75 Hz in established timing I/II
HDMI:EDID standard timings block x 8: 0x818F 8180 714F 7140 614F 6140 454F 4540
HDMI:EDID found DMT format: code 36, 1280x1024p @ 75 Hz (5:4) in standard timing 0
HDMI:EDID found DMT format: code 35, 1280x1024p @ 60 Hz (5:4) in standard timing 1
HDMI:EDID found DMT format: code 21, 1152x864p @ 75 Hz (4:3) in standard timing 2
HDMI:EDID unknown standard timing 1152x864 @ 60 Hz aspect ratio (4:3)
HDMI:EDID found DMT format: code 18, 1024x768p @ 75 Hz (4:3) in standard timing 4
HDMI:EDID found DMT format: code 16, 1024x768p @ 60 Hz (4:3) in standard timing 5
HDMI:EDID found DMT format: code 11, 800x600p @ 75 Hz (4:3) in standard timing 6
HDMI:EDID found DMT format: code 9, 800x600p @ 60 Hz (4:3) in standard timing 7
HDMI:EDID filtering formats with pixel clock > 162 MHz or h. blanking > 1023
HDMI:EDID best score mode is now DMT (5) 640x480 @ 72 MHz with pixel clock 31 Hz (score 44236)
HDMI:EDID best score mode is now DMT (6) 640x480 @ 75 MHz with pixel clock 31 Hz (score 46080)
HDMI:EDID best score mode is now DMT (8) 800x600 @ 56 MHz with pixel clock 36 Hz (score 53760)
HDMI:EDID best score mode is now DMT (9) 800x600 @ 60 MHz with pixel clock 40 Hz (score 157600)
HDMI:EDID DMT mode (10) 800x600p @ 72 Hz with pixel clock 50 MHz has a score of 69120
HDMI:EDID best score mode is now DMT (11) 800x600 @ 75 MHz with pixel clock 49 Hz (score 172000)
HDMI:EDID best score mode is now DMT (16) 1024x768 @ 60 MHz with pixel clock 65 Hz (score 194370)
HDMI:EDID DMT mode (17) 1024x768p @ 70 Hz with pixel clock 75 MHz has a score of 110100
HDMI:EDID best score mode is now DMT (18) 1024x768 @ 75 MHz with pixel clock 78 Hz (score 217964)
HDMI:EDID best score mode is now DMT (21) 1152x864 @ 75 MHz with pixel clock 108 Hz (score 249298)
HDMI:EDID best score mode is now DMT (35) 1280x1024 @ 60 MHz with pixel clock 108 Hz (score 5257286)
HDMI:EDID DMT mode (36) 1280x1024p @ 75 Hz with pixel clock 135 MHz has a score of 296608
HDMI:EDID preferred mode remained as DMT (35) 1280x1024p @ 60 Hz with pixel clock 108 MHz
HDMI:EDID has only DVI support and no audio support
edid_parser exited with code 0

allcardr
Posts: 26
Joined: Sun Feb 26, 2012 8:09 pm

Re: HDMI to DVI not working on Acer monitor

Sun May 27, 2012 11:18 am

altered my conf file to force over to dvi and to force onto format code35, still no joy. even deleted theconf file, still no display!

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piglet
Posts: 946
Joined: Sat Aug 27, 2011 1:16 pm

Re: HDMI to DVI not working on Acer monitor

Sun May 27, 2012 12:12 pm

Have you tried hdmi_force_hotplug= yet? That did the trick for me as detailed in the other thread: http://www.raspberrypi.org/phpBB3/viewt ... =26&t=6631


These monitor issues have to be fairly well up the list of things to get bullet-proof before the educational release. There's going to be a very wide range of monitors being used by schools, and if it doesn't just "work" when plugged in it's going to flop right there.

Our school has any number of different monitors. There's no way anyone maintaining these things in class/school-volume is going to be able to tinker with each make and model of monitor on individual SD cards to get a picture on the screen.

milhouse
Posts: 642
Joined: Mon Jan 16, 2012 12:59 pm

Re: HDMI to DVI not working on Acer monitor

Sun May 27, 2012 12:17 pm

piglet wrote: These monitor issues have to be fairly well up the list of things to get bullet-proof before the educational release. There's going to be a very wide range of monitors being used by schools, and if it doesn't just "work" when plugged in it's going to flop right there.

Our school has any number of different monitors. There's no way anyone maintaining these things in class/school-volume is going to be able to tinker with each make and model of monitor on individual SD cards to get a picture on the screen.
No doubt why dom is asking for the edid data whenever someone encounters a problematic display. It's in everyone's interest that they get this data.

allcardr
Posts: 26
Joined: Sun Feb 26, 2012 8:09 pm

Re: HDMI to DVI not working on Acer monitor

Sun May 27, 2012 6:58 pm

Got both Raspbian and Debian squeeze working via HDMI to DVI ona different monitor with no issues, so that rules out the cable at least. Looks like the issue may well be monitor specific.

allcardr
Posts: 26
Joined: Sun Feb 26, 2012 8:09 pm

Re: HDMI to DVI not working on Acer monitor

Thu May 31, 2012 6:11 pm

Fixed it !!

I amended my conf.txt file with the line
hdmi_force_hotplug=1

and this solved the problem!

superbantam
Posts: 7
Joined: Sat May 26, 2012 7:03 pm

Re: HDMI to DVI not working on Acer monitor

Thu May 31, 2012 11:06 pm

allcardr,

Glad your monitor is working ok now, is there any chance you could post your full config.txt file? I'm having a similar problem with my pi/monitor on dvi

http://www.raspberrypi.org/phpBB3/viewt ... =28&t=6918

Thanks.

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