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Old 01-29-2010, 05:52 PM   #1
SenLinux
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Location: Burlington, VT
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HP 30" monitor not showing video display on RHEL 5.3


Hi,

Greetings. I have RHEL 5.3 running on Cray CX1. I am trying to connect to HP LP3065 30" monitor and not getting any video display (no response at all). Monitor is working fine on Windows system. Monitor has only DVI-D ports and my Cray system also has DVI socket to connect with. I checked for drivers at HP site and I couldn't find one anywhere else.

I have NVIDIA quadro FX4800 video card and NVIDIA driver installed.

Thanks in advance for your time and suggestions.

Thanks,

Sen
 
Old 01-29-2010, 07:16 PM   #2
thorkelljarl
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Cross check...

You have tested that the monitor functions, but if you have not yet, might you not try to set the system to some other screen to see that the card is functioning and then that the card and Nvidia driver are functioning?

You could first try a known working screen and RHEL with the "nv" module from the linux kernel. I am not familiar with RHEL, but I remember that in general one can either edit the "xorg.conf" file or use the command "modprobe" to load a particular module. I found this for RHEL 4; it may still apply. You may have more recent documentation of your own. See also "man modprobe"

http://www.redhat.com/docs/manuals/e...iguration.html

The next test would be to re-install and test the Nvidia driver on the same setup. Are you using the correct x86_64 driver? Did you install the driver from the RHEL repositories with YUM or did you download it from Nvidia and install it yourself? If I install the Nvidia driver from my openSUSE repositories, I must install both the driver and the driver kernel module packages. If you used Nvidia, did you read and follow the advice in the "README"?

http://us.download.nvidia.com/XFree8...hapter-01.html

Notice the requirements listed in Chapter 2. You need to check that the kernel source and the kernel headers that are part of the "kernel modutils" package comply in their version number.

If the driver installs, but does not function, you might try again, installing the beta version of the latest driver available.

Most problems occur and mistakes are made when installing the driver from Nvidia, but the process allows more control and may install the driver while YUM will not. Good Luck.

You have a better chance of receiving a qualified reply to your question if you give a more detailed description of what you did, what you tried to solve the problem, and any error messages that were displayed.

http://www.linuxquestions.org/linux/...Ask_a_Question

Last edited by thorkelljarl; 01-30-2010 at 04:07 PM.
 
Old 01-29-2010, 08:26 PM   #3
SenLinux
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Hi Thorkelljarl,

Thanks for the reply. Excuse me for not mentioning that I was using Dell 20" monitor on the same system without any problem. I installed NVIDIA driver from its website and followed their instructions properly and it was installed successfully and I have been able to do 3D rendering for big molecules(which consumes lots of memory). I mentioned about NVIDIA, thinking that the information will be useful for our forum members.

I hope I clarified things now. thanks again..

Sen
 
Old 01-29-2010, 09:04 PM   #4
thorkelljarl
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One more try...

The 30" works on another system, but has it been tried on a different linux system with a Nvidia driver installed, either the latest or one that is recent?

You can download and burn a live-cd of Mint or PCLinuxOS, each with an already configured Nvidia driver, stick it in the nearest PC, then your Cray, and live boot just to see if you can get anything to appear on the big screen, and if it is a case of both, the PC, the Cray, or neither working.

You could also try a live-cd of one of the recent linux releases that will load the "nv" driver. Try the ubiquitous Ubuntu, or openSUSE 11.2 KDE, which has good graphics hardware recognition.

Since you haven't mentioned that you've done such a test, the idea is to try the 30" screen with another linux system and another linux distribution to see if it will function with linux under any circumstances at all.

Otherwise, I'm reduced to admonishing you to check all the plugs and connections , switch the DVI cable, etc.

I noticed that the FX4800 has a DVI-I output while you write that the 30" has a DVI-D input. Google tells me that you need to use a DVI-D Dual-link cable for the connection even though the pin array of the connectors is the same.

I take it that this is not your Cray at home, but that there might be some hardware and software support at the University of Vermont where this Cray is likely to live. Maybe they can help.

I don't mind scratching my head trying to think of what could be the matter from the other side of the world, but I'll be peeved if you fix this problem and do not post back with a good description of the solution.

By the way, it is snowing in Copenhagen and the white, that White, well cloaks our city.

Last edited by thorkelljarl; 01-31-2010 at 08:18 AM.
 
Old 01-30-2010, 07:01 AM   #5
thorkelljarl
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?

Did you go through this routine to isolate the fault to the monitor or to the signal? I noted Step 2.

http://h20000.www2.hp.com/bizsupport...ctID=c01295035

Last edited by thorkelljarl; 01-30-2010 at 07:04 AM.
 
Old 01-30-2010, 11:25 AM   #6
SenLinux
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Problem Solved !!


Hi Thorkelljarl,

Thank you somuch for the detailed help. NVIDIA quadro FX 4800 video card has HDMI socket and I connected this monitor (HP LP3065) using HDMI to DVI cable and rebooted the system. Atlast I could see the display !!. Now I am fixing the resolution problem. This monitor recommends 2560 x 1600, 60 Hz refresh rate.. I tried display gui to change the resolution, but somehow it did't work. I restarted X server using ctl+alt+ backspace. Still the same old resolution (1028 x 768). I haven't read our forum for this problem, I will try to fix and post the final one with detailed information. Thanks again for your great help.

Sen
 
Old 01-30-2010, 01:00 PM   #7
thorkelljarl
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A thought ...

Well done on getting a signal.

You might not be getting a higher resolution due to the limitation in your cable specifications. The specifications from Nvidia list the outputs as one dual-link DVD-I and two DisplayPort ports, allowing a maximum of 2560x1600 @ 60Hz on either type port. Nvidia say nothing about a HDMI port, but you're the one with the card in hand.

Since the LP3065 screen documentation calls for a dual-link input for full performance, I assume that the requirement is the same for both output port types. Were the signal to be limited by your cable or adapter, the screen would likely revert to its default resolution, 1028x768, as it has.

There a two interchangeable HDMI-DVI adapters available, one dual and one single-link. If you are in fact using the DisplayPort with an adapter to your DVI cable, the best adapter I could find has a maximum of resolution of 1920x1200, and all the adapters seem to be single-link.

I would check the cable and adapter again; you surely need dual-link for 2560x1600.

Then again you could go large-new year,new budget-new DVI-D. Right here. Cost you twenty bucks.

http://www.newegg.com/Product/Produc...-056-_-Product

First, however, you could try to change the Nvidia settings with "nvidia-xconfig" or edit the xorg.conf file to see if the problem is one of detection, and if the correct xorg.conf will give you your high resolution.

http://http.download.nvidia.com/sola...hapter-02.html

Again, it is a question of isolating the cause of the problem. Luck Again.

Last edited by thorkelljarl; 01-30-2010 at 06:45 PM.
 
Old 01-30-2010, 01:32 PM   #8
SenLinux
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Problem solved with higher resolution 2560x1600_60 !!

Thanks a lot Thorkelljarl !!. I edited xorg.conf file and made the following changes:

Section "Monitor"

ModelName "LCD Panel 2560x1600"
HorizSync 31.5 - 101.0 # earlier the upper limit was less than 100



Section "Screen"

SubSection "Display"
Viewport 0 0
Depth 24
Modes "2560x1600_60"

and restarted Xserver by pressing ctl+alt+backspace. No changes took place. As you have mentioned,
it could be because of HDMI. Even I rebooted the system but it didn't change the resolution. After that
I connected the DVI-D adaptor that came with the monitor directly to NVIDIA DVI-I output and rebooted the system

Everything works well now. Resolution is 2560x1600 and looks really great !! its really an awesome monitor.


Thanks so much for your valuable suggestions. I sincerely appreciate that.

Have a great weekend.

Sen
 
Old 01-30-2010, 01:47 PM   #9
thorkelljarl
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Welcome,welcome...

All for science; rend a molecule for me.

Last edited by thorkelljarl; 01-31-2010 at 08:16 AM.
 
  


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