Debian :: Monitor Not Detected Unless Connected With HDMI

Nov 13, 2015

I noticed that Debian 8 has a significant bug related to detecting presence of display(s). Today, I woke my computer from sleep while the LCD monitor was unplugged from power (the monitor is connected via DVI) then I powered the monitor but nothing was displayed. Next, I connected another monitor via HDMI and both screens started working. However after disconnecting HDMI cable from the second monitor the first one with DVI stopped showing anything. The conclusion of this situation is that HDMI monitor must be connected all the time.

I thought that this is caused by graphics driver, but I experienced the problem on different machines, one with nvidia driver and DVI, and the second with default free driver and DisplayPort.

I just checked that this is related to KDE. After switching to console using ctrl+alt+f1 the screen turns on, but when I am going back via ctrl+alt+f7 the screen disappears.

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Debian Hardware :: Monitor Not Detected On HDMI

Aug 16, 2015


I'm using i386 Jessie Debian, have an i7 Intel processor and Gtx 745 4gb NVidia GPU.

I am running with nomodeset due to blurring issue but issue occured without nomodeset too.


When I start Debian with just a monitor in the HDMI slot it doesn't recognize the monitor and keeps the monitor at 1024x768.

When I start Debian with monitor in both DVI and HDMI slot it only activates the DVI monitor (with proper resolution). PC has no VGA I have no DP cable.

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1920 x 1080, maximum 1920 x 1080
default connected primary 1920x1080+0+0 0mm x 0mm
1920x1080 0.00*
1280x1024 0.00
1024x768 0.00
800x600 0.00
640x480 0.00

Which is my dvi monitor, no other screens detected. Is there any way to get the HDMI to run properly?

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Ubuntu Multimedia :: Monitor Is Connected Via An HDMI Cable But No Signal

Jul 21, 2011

I am running 11.04 on a new Gateway with 8 gigs of ram. It is a solo installation. The monitor is connected via an HDMI cable. Everything was great (installation running smoothly for over a month) until last night. I just installed a netgear router and was setting it up with the system to try to get Stanza on my IPAD to connect to Calibre. Anyway, i suffered a severe freeze up warranting a hard boot. I could see the drive working, ancillary drives lit up, keyboard lit up so I know the system is working. The monitor did not come on, It shows a yellow light indication no signal. It is a 28" Hansspree. I tested the monitor by hooking it to a laptop. The monitor is fine. I cannot see anything on the screen so I can't boot to repair mode or use a CD. There is no signal.

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Debian Hardware :: Monitor Working With VGA But Not With HDMI / DVI

Jan 13, 2016

My monitor (Dell U2412M) has a VGA port, a display port and a DVI port. I can connect it to my laptop with VGA, no problem, but I'd rather use one of the other ports. I have a HDMI-to-DVI cable, so I tried that. That didn't work with my laptop, so I tested this HDMI-to-DVI cable with my raspberry pi, and that works perfectly. So, the problem is probably not the cable and not the DVI port on the monitor.

What happens when I plug the HDMI-to-DVI cable into my laptop is a bit weird. It's not a blank screen or anything, but part of the messages I see during boot. The last lines on the screen (the others relate to stuff that is probably not relevant for this issue), are these:

Select all[   10.823974] [drm] nouveau 0000:01:00.0: 0x7232: i2c wr fail: -6
[   10.825122] [drm] nouveau 0000:01:00.0: 0x7244: i2c wr fail: -6
[   11.487584] [drm:intel_dsm_platform_mux_info] *ERROR* MUX INFO call failed

I have had quite a bit of trouble with my GPU on this laptop, and as far as I can tell, the laptop does not use the nvidia card but rather has defaulted to the on board intel chip. Could these issues be connected?

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Debian Multimedia :: Keep Laptop Screen Lit When Plugging In HDMI Monitor

May 7, 2015

Where the script is for Gnome 3. When I plug the HDMI cable, the desktop expands to include both, but disables the backlight on the laptop monitor. I have to restart gdm3 or the laptop for the brightness control to bring it back up. First, why would it turn brightness to 0, and how do I change the default of that so it stops. I plug and unplug the HDMI regualarly while I wait for a new desktop and the laptop has to pull double duty.

I just switched from Ubuntu 14.10. It never blacked out a screen on plug in or removing. That means that there must be some way to do it, however, it used Unity and this is Gnome 3.

I installed KDE. It works as well. I will use it for now, but would like to get Gnome 3 to work. My default is gdm but I think I saw I can switch it to kdm.

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Debian Hardware :: System Does Not Recognize External Monitor Via HDMI

Jun 30, 2014

Ok so I just installed Debian 7.5 on my laptop and encountered several problems.

First off was the problem with GNOME 3, GNOME 3 failed to load.

Second problem was that the system does not recognize an external monitor via hdmi. Via VGA I do not know do not have a cable to try it out.

Third problem was that my wireless was no recognized.

Dell Inspiron 5537 Laptop
wireless: Network controller: Atheros Communications Inc. AR9565 Wireless Network Adapter (rev 01)
Graphics card: VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 09) from the 4xxx series
System: 3.2.0-4-amd64 #1 SMP Debian 3.2.57-3+deb7u2 x86_64 GNU/Linux

Before I had Fedora, but only cuz all the devices were recognized by default, for a while now I wanted to switch over to Debian but as I came to relize my hardware for some reason is not working.

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Debian :: Monitor Is Not Detected

Feb 19, 2009

I install the debian on my PC, but the monitor is not detected or not adapted ( while it is for linux CD live, and windows XP). it gives the following errors :

I want to use the file xorg.conf given by CDlive ( sidux for example) and copy it in the /etc/X11 of my debian, is it enougn or I need ohter configuration ?

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Debian :: Primary Monitor (VGA) Not Detected

Sep 29, 2015

Today I set up the energy settings like that:

10 minutes (screen), 20 minutes for suspension.

After around 30 minutes, I came back and switched back on the pc.

The primary monitor (VGA) was not detected, even after a system reboot.

More info about my pc:
Debian stable 8.2, kernel 3.16.0-4-686-pae.
I have an Nvidia card, but currently I am using nouveau drivers.
Two monitors: VGA (primary) and DVI (secondary).

Later I could get my primary monitor to work by switching tty (ctrl+alt+f3 and typing "startx" in the console).

I guess this is related to Xorg configuration (/etc/X11/xorg.conf is empty), but I am not really sure.

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Debian Hardware :: External Monitor Not Detected

Oct 20, 2015

My system can't seem to detect the external monitor that I've plugged into my laptop using and HDMI cable. The monitor works when I'm booted into Windows so I know that it isn't a problem with the monitor or the cable.

When I run xrandr I get.

Code: Select allScreen 0: minimum 320 x 200, current 1600 x 900, maximum 8192 x 8192
LVDS1 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 310mm x 174mm
   1600x900      60.00*+  39.99 
   1440x900      59.89 
   1360x768      59.80    59.96 
   1152x864      60.00 
   1024x768      60.00 
   800x600       60.32    56.25 
   640x480       59.94 
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)

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Debian :: 8.1 Second Monitor Is Detected But Only Showing Black Screen

Jul 30, 2015

I've recently installed Debian v8.1 and installed Nvidia driver 340.46. In nvidia-settings I am able to enable my second monitor and enable it/set it's position..etc. My second monitor is not being detected in Debian Display and is 'on' but only showing a black screen. I've tried researching and implementing various 'fixes', but I'm not having any luck.

I'm running dual GTX 570's with a monitor plugged into one each (DVI). I noticed in my xorg.conf under Section "Screen" I have an option "MultiGPU" "Off"; would this be part of the issue?

I've tried:
- purging all nvidia drivers and re-installing
- installing different versions of nvidia drivers
- add nomodeset in grub

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Fedora Hardware :: External Monitor Not Detected - Dell Laptop - Monitor

Aug 17, 2011

My software and hardware information are as follows. I have Fedora 12 and KDE 4.4.5 installed on a Dell Vostro 1500 laptop. I believe it's a 64 bit processor; it's an Intel Core 2 Duo CPU. The external monitor is a Dell as well.

My problem is that my system does not seem to be detecting an external monitor that I have connected. Everything else is working just fine; however, I would like to have the option of attaching an external monitor. When I plug the external monitor into the laptop, the external monitor remains black and appears to be in power save mode. The results of xrandr -q (with or without the external monitor attached: it doesn't appear to change) are as follows.


How can I get my laptop to recognize that the external monitor is even connected? Let me know if I can be more specific or provide additional details.

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Ubuntu Multimedia :: Overscan - HTPC Connected To LCD HDTV Over HDMI?

Dec 12, 2010

I have an HTPC with an onboard ATI video chipset but for hardware acceleration's sake, I installed a GeForce 9500GT video card. Everything works quite well, except for the overscan issue. I've installed the latest nvidia binary drivers (manually) but I don't see any options in nvidia-settings to solve this overscan issue.

Here is my xorg.conf file:

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 260.19.21 ( Thu Nov 4 20:57:26 PDT 2010
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0"


I tried adding that ModeLine line myself (using xrandr and gtf) but that fails too. I've scoured the web and these forums, and I've seen some overscan issues reported but with no solution in sight.

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Fedora Hardware :: F14 - No HDMI Port Detected / No Display?

Dec 1, 2010

Acer Aspire 5820 TimelineX, Mobility Radeon 5650, running open source radeon drivers. Laptop has VGA output (haven't tried it yet, will later tonight, I suspect it works) and an HDMI output. Monitor connected to laptop through HDMI causes garbled picture (either a set of lines made of little square blocks or a pink vertical line running down the leftmost edge with white, dashed horizontal lines travelling up the screen from the bottom to the top and repeating). The previous happens at startup, the latter happens if I disconnect the monitor and plug it back in again after logging in.

Running KDE 4. HDMI port is not detected (does not show up in gnome-config-display or in krandr or in xrandr). It does show my laptop's built in screen and my VGA output, but does not list my HDMI output anywhere. HDMI seems to show up in a message in dmesg, but other than that, no.

Included is the output of a few commands. All commands were run with the monitor plugged in to HDMI. 'monitor-probe-using-X radeon' failed with "Unrecognized option: -probeonly". Monitor does not display anything if plugged in on startup (some people got something, then it disappeared when X started). I haven't played with Xorg.conf yet, I'm not sure what to write for HDMI output. I haven't tried the fglrx drivers yet ((*shudders*)). I can't get any info on this problem, other people have had similar issues but they had trouble with getting a particular resolution to work or no sound through HDMI. I don't care about sound, just want a picture. Monitor is an LG Flatron L246WH. I can use VGA if push comes to shove, but I'd really like to get HDMI working.

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Ubuntu Multimedia :: Nvidia HDMI Audio Output Not Detected

Jul 25, 2011

I am interested in finding out the best way to get my audio to work from HDMI through my NVIDIA card.


I don't get an option for HDMI. Here is the interesting part. The sounds work sometimes but not all the times. Most of the time the sound works on the OS default sounds but wont work for movies, streaming and music. I am running pulseaudio. I am new to setting this audio up. The headphones work fine.

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Fedora Networking :: Wifi Detected But Not Connected

Dec 2, 2010

I just installed Fedora 14 i386, and Fedora can see the wireless network just fine. I try to connect and nothing happens. It asks for the PSK constantly (yes, I promise I'm entering it correctly), even after I enter it correctly (I guarantee). I've searched around here a bit, but due to my limited knowledge in linux system I can't figure it out

Bus 002 Device 002: ID 1737:0071 Linksys WUSB600N Dual-Band Wireless-N USB Network Adapter

lo no wireless extensions.

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Ubuntu Networking :: Wireless Network Detected But Not Getting Connected

Aug 15, 2010

I've installed Ubuntu 10.04 32 bit version(dual OS) on my 64 bit Pentium core2 duo 2.2GHz processor. Everything seems to be working fine except it's not getting connected to wireless network, although it's detected the network .It was working fine(got connected to wireless network) when I had installed the same OS via virtual machine.

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Fedora Networking :: WiFi Detected But Not Connected - Wireless Just Fine

Sep 7, 2010

I've recently salvaged a computer I found gathering dust in the basement and decided I'll have it running on Fedora (I have a summer studentship coming up that needs Linux use so I thought I'd best start learning!). Following a clean install, Fedora can see the wireless network just fine. I try to connect and nothing happens. Half of the time it will ask for the PSK (yes, I promise I'm entering it correctly) and the other half of the time it will just stop. When it does ask for the PSK I enter it (correctly) and it will ask me again... and again.

uname -r

00:0b.0 Network controller: Broadcom Corporation BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller (rev 02)

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Ubuntu Multimedia :: Monitor Shows Nothing With HDMI?

Dec 28, 2010

I just installed a new GT240 w/HDMI and I have a new Vh232H monitor w/HDMII connected the video card and monitor via HDMI cable and started the computer.Nothing.The monitor is not getting a signal via HDMI.

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Ubuntu Multimedia :: HDMI Sound On Monitor But Not On TV

May 13, 2011

the HDMI sound just doesn't work with PHILIPS LCD panel, but works fine with computer LCD monitor. I've tried following the numerous threads on those forums but in the end couldn't get any sound from TV. Sound plays fine if I plug it in windows 7 laptop.

Current system state:

BIOS settings for Azalia internal+external
Natty with all updates
Recompiled alsa 1.0.24 via alsa upgrade script

probe_masked hdmi device (there're also analog and S/PDIF devices on Relatek chip, but they are not loaded with current configuration)NVidia current (270.41.06)

aplay -l


**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0


Same results were observed on ubuntu alsa 1.0.24

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General :: Does Not Recognize - No Scanners Detected - Please Check Your Scanner Is Connected And Powered On

Aug 11, 2010

I have HP Scanjet 3770. UBUNTU 10.04 installed on my desktop. HPLIP also installed. This scanjet working well in Windows Xp but in ubuntu SimpleScan does not recognize it.

It shows:- No scanners detected Please check your scanner is connected and powered on.

I Also visited [url] & found as below-

ScanJet 3770 Unsupported. While an external binary-only backend exists, it works only on Linux i386. Therefore the scanner is unsupported on other platforms.

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Hardware :: Converting HDMI Computer Output To VGA Monitor Input?

Dec 31, 2010

I have a small 'nettop' computer that only has a HDMI output. The only monitors I have only have VGA input. Is there a way to use a HDMI-to-VGA or HDMI-to-DVI + DVI-to-VGA connection setup to hookup this computer to my monitor?Let me make it clear that I am not looking for a high-quality, high-definition display. This is going to be hooked up to a monitor only until I have the system up and running and then it'll be a ssh-only headless server

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Software :: HDMI Driver For Benq Monitor G2420hd On Opensuse 11.x?

Jun 12, 2010

How can the benq monitor g2420hd be detected/used by opensuse 11.2x 64 bit ? graphics card is ATI Radeon HD 3200 Graphics with hdmi output connector

Steps to Reproduce:
- Attach moniter to laptop via hdmi cable.
- Turn monitor power on.
- power on laptop

Actual Results:no output on external monitor. Expected Resultsutput on external monitor.

xrandr shows
# xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
VGA-0 disconnected (normal left inverted right x axis y axis)


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OpenSUSE :: VNC Without Monitor Connected?

Jan 9, 2010

easy I managed to install Oracle, JBoss and other software, connected to it via VNC. Once finished I decided to move the box to far corner and work with it via putty and vnc. But then problems with vnc started. Whenever I tried to connect via vnc I got background screen with cross cursor and then it stuck, no login screen. I spent a lot of time trying to fix it. I red many forums and this one in partucular : VNC is not working - openSUSE Forums Nothing helped. I have noticed that vnc doesn't work if monitor not physically connected to the box.

Once monitor connected, even if monitor is not powered up, vnc resumed to work correctly. But it looked senseless for me, what a point to have Linux box controlled via vnc if I still have to connect monitor, it drove me crazy !Today I have found a solution and want to share with you. It is not my idea I have found it here :K7V FreeNAS system won't start without a monitor. - alt.comp.periphs.mainboard.asus | Google GroupsThe idea is to create "fake monitor" which cheats graphic card, makes it think a monitor is connected. I have bought a VGA connector then:

Connect 75 ohm resistor from pin 1 to pin 6
Connect 75 ohm resistor from pin 2 to pin 7
Connect 75 ohm resistor from pin 3 to pin 8


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Ubuntu Multimedia :: Dell Mini 10 Hdmi Output - Not An Option For A Different Monitor

Aug 6, 2011

I have a Dell mini 10 netbook that I am trying to set up as a temporary HTPC. Using XP, I can send the video and audio over the HDMI connection, but when I attempt to do so from Ubuntu, there is not an option for a different monitor.

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Fedora :: 11 Won't Boot Without A Monitor Connected?

Nov 17, 2009

lt a file server using Fedora 11, and it works great if the monitor is connected. If I disconnect the monitor, Fedora 11 won't boot; it hangs. I have found many people having the same problem, but no one seems to have a solution.

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General :: Ubuntu - Run A Script When An External Monitor Is Connected?

May 2, 2011

How can I detect when an external monitor is connected in linux? I need to run various scripts to set up my workspace. Is there some clever way to kick off a script when the monitor state has changed? I'm using the Nvidia display driver.

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Ubuntu :: Check Via Terminal If External Monitor Is Connected?

Apr 20, 2010

Ive been wondering about an alternative method for checking to see if an external monitor is connected.
Currently I am using:

if $(xrandr --prop |grep -q "$EXTERN connected");then
echo -e "$(echo $EXTERN | tr -d [0-9]) is e[1;32mconnectede[0m"


So, what I am asking is, is there a way to ignore/over-ride compiz's texture size check, a different way to query xrandr, or is there a completely different method I can go about checking if an external monitor is connected?

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Ubuntu :: Setting The Resolution For A Monitor Connected To Laptop

Jul 16, 2010

I have connected to the VGA output of my laptop a 19" monitor. I setted in Ubuntu the resolution for that monitor to 1280x1024.

Two days ago i connected the laptop to a projector. When Ubuntu detected the projector it ask me for my user password to change "i dont know what".

After using the projector I have connected the laptop to the 19" monitor again. Now I can not set the resolution for the monitor to 1280x1024 (that resolution doesn't appear in the list)....

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Ubuntu Servers :: Vnc Doesn't Work Unless Monitor Is Connected

Feb 17, 2011

Last night I was able to set up my server so that I can just connect vnc. I even was able to be connected at the log on screen so I could select which user I wanted to log in at. For some reason today, I have to have the monitor plugged in all the until the logon screen comes up before vnc will connect. Once the logon screen is up, I then can connect via vnc & select which user I want to logon as. It's odd because it worked last nigh, but today - Nope nada, it doesn't work & I can't explain why. I did clean up - Removing some applications I don't need on my server. (I'm hoping that isn't the problem) It's odd as well because I don't have to be logged on as a user to connect via vnc, I just have to wait until the logon screen is available...Then I can unplugged the monitor & logon.

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Fedora Hardware :: Monitor Not Detected

Dec 14, 2010

I have a ViewSonic (VA1703w) LCD and Fedora 14 is not detecting it. I want to change the resolution but it is fixed to 1024x768. I have also tried to add the resolution in xorg.conf but no effect.

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