Dual monitors go blank at random times

My mid-2010 Mini works fine, but lately my dual Dell monitors have started going blank at the same time. The only recourse is to power down the Mini and restart and the monitors come back fine. This has happened twice just today. A few months ago I went through a period where one monitor would go blank. That seemed to cease, but now both will go blank at random times.
Any updates on this problem?
Tx,
WK

First try resetting the NVRAM / PRAM, as per > About NVRAM and PRAM
Then what connections and adapters are you using..?
I have the same 2010 Mac Mini w/8GB RAM set up using dual 21.5" Samsungs DVI monitors. One is on the Apple Supplied HDMI to DVI adapter and the other is on a Kanex Mini DisplayPort to DVI adapter. I'm using the Kanex adapter, because I had nothing but the same trouble that you are describing using other Mini DisplayPort to DVI adapters including a couple of Apple branded ones.

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Hello @jlh41,
I understand that you are experiencing an issue where your HP Omni 220-1050xt Monitor is going blank without warning. I am providing you with some steps you can try below:
Step 1. Unplug the power cord from the back of the monitor and the wall
Step 2. Hold the power button down for at least one minute
Step 3. Plug the power cord back into the monitor and then into the wall outlet (not a power bar or surge protector)
Step 4. Press the Menu button on the monitor
Step 5. Navigate to the Factory Reset option and select it
Step 6. Try different cables between your computer and monitor.
If the above steps did not resolve your issue you can try the monitor on a computer or other device to see if the issue persists. Please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
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[SOLVED] openbox margins with dual monitors

Hi community,
I have stumbled to a nasty problem on my first incursion to dual monitors in openbox.
I'm using xrandr with this command (which works just fine BTW):
xrandr --output LVDS --mode 1280x800 --primary --output VGA-0 --mode 1280x1024_60.00 --gamma 1.0:1.4:0.85 --right-of LVDS
and have set a Virtual screen in xorg.conf of 2560 x 1024 pixels.
But, my laptop monitor only handles 1280x800, while my external LCD monitor has 1280x1024, so there is a virtual area under my laptop screen which i'm not using, but i dont really care about that.
The problem is that when I'm setting screen margins, so that maximized windows will respect the panels in the bottom (tint2), in rc.xml (or by obconf) the margins are applied to the virtual screen and only are practical on the external monitor wich has more pixel height.
I'm really missing some kind of per monitor margin settings in openbox, maybe there is and i haven't found it? It makes me wonder because openbox can maximize windows to a single monitor, even if the whole layout it's treated like a virtual screen, so it has some way of distinguishing between them.
I would appreciate any suggestions, thanks.
Last edited by andreamer (2010-07-26 18:32:15)

TL;DR - I'm not aware of any acceptable solution at the moment.
Basically, what you're having problems with, is the "dead area." It can really be quite a pain in the butt if window managers or other screen aware applications don't anticipate it properly. To my knowledge, Openbox doesn't support margins on a monitor-by-monitor basis. In reality, you shouldn't need to be setting margins anyway. Tint2 should be reporting itself as a taskbar, and Openbox should be respecting that.
I have dead area too, with multiple monitors, and Openbox respects both of the KDE taskbars I have running (one on each monitor). (I use KDE and simply replaced Kwin with Openbox.) This tells me that tint2 should be able to cooperate with Openbox. I remember trying tint2 a while ago, and didn't fine it adequate in a dual monitor environment (it was probably a year ago or so). tint2 would need to be setting the _NET_WM_STRUT_PARTIAL hint, and I'm not sure if it is (or if it's doing it properly). See http://standards.freedesktop.org/wm-spe … #id2507618
Also, I do know that the developer for Openbox recently got a dual monitor setup, and she's been adding additional support for dual monitors a little at a time. Hopefully with 3.5, there will be a lot more support. (Margin support for multiple monitors would be great, because it could be a good utility knife for applications that don't care about multi-monitors setups and don't set the proper hints.)
If you're capable of modifying tint2, my course of action would be to try something that works (like the KDE taskbars) and record the hints being set there. Then compare them with tint2 and try to mirror KDE's setup. (If you're a programming lacking experience with X and related nonsense, I'd be more than willing to offer what guidance I have.)
Also, I developed a panel myself (and got pretty far along) using the PyGTK toolkit... But I can't remember if I solved this problem or not. I'll try to check it out and get back to you. (I got as far as implementing a widget system that includes a task list, system tray, clock, menus... It just isn't polished very well. My original intention was for it to be a more robust PyPanel with dual monitor support.)
Last edited by BurntSushi (2010-07-24 22:46:23)

Dual monitor (w/laptop): external monitor is blank.

Hi! just installed arch for the first time a day ago. Right now what I'm working on is on getting my second monitor running (mostly for development purposes... and movies ^__^).
I'm using Arch64 with the open ATI driver and KDE. Whenever I connect the external monitor, the monitor seems to detect a connection occurred (the "check video cable" message disappears when I connect it and comes back when I disconnect it), and so does KDE. When I open my display settings, it tells me a new monitor was connected and asks me if I want to configure it.
Then I choose to configure and use the two monitors giving the following screens (right now I'm at college testing with monitors in there, thus the low resolution, but behavior seems to be exactly the same):
(EDIT: resized. In case of wishing to read full images, just take the "resized/" out of the URI)
However pretty the full screenshot looks like (... I just mean that even if it looks like the second monitor is working), the monitor remains blank.
Using arandr (xrandr's gui), it is exactly the same result. I might be doing something wrong (almost certainly I am ) (EDIT: decided it was a good idea to show what I did with xrandr).
In /home/<myuser>/.xinitrc my file looks like this:
#!/bin/sh
# ~/.xinitrc
# Executed by startx (run your window manager from here)
xrandr --output VGA-0 --mode 1440x900 --pos 1600x0 --rotate normal --output LVDS --mode 1600x900 --pos 0x0 --rotate normal --output HDMI-0 --off
if [ -d /etc/X11/xinit/xinitrc.d ]; then
for f in /etc/X11/xinit/xinitrc.d/*; do
[ -x "$f" ] && . "$f"
done
unset f
fi
exec ck-launch-session startkde
# exec gnome-session
# exec startkde
# exec startxfce4
# ...or the Window Manager of your choice
The laptop's model is Toshiba Satellite L775d. I'm not sure what other information should be required in this situation, but I will be loving to give anything that isn't compromising
Thank you!
(PS: so far Arch has treated me nicely let's see for how long)
Last edited by Mamsaac (2012-03-16 12:24:27)

Thank you for your response!
# xrandr
Screen 0: minimum 320 x 200, current 3040 x 900, maximum 8192 x 8192
VGA-0 connected 1440x900+1600+0 (normal left inverted right x axis y axis) 410mm x 256mm
1440x900 59.9*+
1280x1024 75.0 60.0
1280x960 60.0
1152x864 75.0
1024x768 75.1 60.0
832x624 74.6
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
LVDS connected 1600x900+0+0 (normal left inverted right x axis y axis) 382mm x 214mm
1600x900 60.1*+
1440x900 59.9
1280x854 59.9
1280x800 59.8
1280x720 59.9
1152x768 59.8
1024x768 59.9
800x600 59.9
848x480 59.7
720x480 59.7
640x480 59.4
I wondered the same. I initially only used KDE for it (that's how it worked in other distros, but I'm guessing Fedora and Kubuntu have way more stuff on top). I moved to xrandr later after searching for options and I did select "Ignore" when KDE asked me to configure and just went ahead with xrandr. The same still happens.
Thanks, I hope I gave the right information.
EDIT: Adding some extra information. I tried rebooting with the CRT cable connected. When the kernel initiated its loading, the messages only appeared on the external monitor. It was afterwards (it was pretty quick, but I will assume it was when radeon's modeset hit) that the external monitor went blank again and, in that situation, the laptop's monitor went blank (so none of the two monitors worked... and I was so hopeful!)
Last edited by Mamsaac (2012-03-16 12:14:51)

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My coworker and I just had our computers upgraded Windows XP 64-bt on the following computer setup:
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Dual G5 freezes at random times...

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I know this particular problem has already been answered, but I'll offer my recent experience for others that have random freezes.
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Dual Monitor Causing System Problems?

Hi, I'm new to this site, so I hope this is where I ask this question! My design group switched to G5/Cinema Display screen from old g4 setups mid 2005. I retained my Mitsubishi Diamond Pro 2020u monitor to use as a secondary display for pallettes, extra files, etc. It's hooked up using a dvi-vga adapter.
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G5 Mac OS X (10.4.4) graphic design applications
G5 Mac OS X (10.4.4) graphic design applications
G5 Mac OS X (10.4.4) graphic design applications

I only just disconnected the monitor, so it will take time to tell if that's a factor. As for the kernel panics, although it's always the same scenario (placing images from server through InDesign) they happen very randomly; it's not happening every single time I place a file. In fact, I just placed an image on the server into an ID doc I have on my desktop, no problem. So I can't say for sure that it has happened when working from my desktop or only when working on the server.
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Solved!
Go to Solution.

I have not changed any software or drivers (knowingly), and I had already checked the cables to make sure they were all tight, so off I went to ransack the house to dig out the spare cables. DVI cable? no change. Power cable? no change. Converter cable - OMG!!!! IT WORKS!!!!
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wgarn wrote:
I have attempted to connect one monitor via HDMI and the other one via the VGA interface.
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It's the graphics card and the number of physical connections available. You might have 3 connections (notebook display being one) but the graphics card likely does not support more than 2 monitors. Intel graphics only support 2, however you may be able to find some AMD chips that will support more however that would be a major upgrade.
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Hi all,
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I hate to burst my own bubble here, but I recently added a 3rd monitor, and now I'm getting the same inconsistent monitor switching between my second and third monitors.
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Mac Pro, OSX 10.8.2
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Gnome displays the sad monitor and has the error message "..something has gone wrong..~" and will force me to log out. I've only started to experience this after messing with dual monitor settings in nvidia. The dual setup(twinview) worked but once I rebooted, I couldn't get it going for awhile.
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# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 285.05.09 ([email protected]) Fri Sep 23 19:18:19 PDT 2011
Section "ServerLayout"
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Identifier "Screen0"
Device "Device0"
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SubSection "Display"
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EndSubSection
EndSection
I commented out below to get it in again, but it still feels shaky and unstable to log in now. Sometimes I will get the error and after a log out and login, it'll work.
#Option "TwinView" "True"
#Option "MetaModes" "nvidia-auto-select, nvidia-auto-select"
Extra Notes: I have another desktop session with awesome installed(uninstalled now) and could log into that no problem. Awesome was giving me troubles so I uninstalled it. I have 2 gnome desktop sessions, my regular gnome session(the one that crashes), and the other with no window manager(never crashed on startup).
I installed awesome around the same time as configuring the dual monitor setup.
Thanks.

Update.
The crashes are to be expected now. I'm circumventing the whole thing by logging into my other Gnome session without a window manager, logging out and then logging back into my regular Gnome with Metacity.
I've noticed the tty1 sessions(not sure what's it's called) is strange. Apparently my session runs on tty8 but when I try logging in, it'll crash me and tty7 gives me a blank screen with a blinking underscore. The other tty1s work regularly. Not sure if this has anything to do with it.
Is there a way to just reset the Gnome settings?

Dual monitors go blank at random times

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