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Old 03-27-2020, 07:20 AM   #1
Aicha28
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Second Monitor detected but displays "No signal"


Hi,

I'm trying to connect my Laptop (Mint 19.1) to a second monitor (EIZO) with a VGA (for the monitor) - HDMI (for the laptop) cable. The monitor is detected in the Display panel but it's showing "no signal" no matter which resolution I use.
This is the output of my xrandr

Code:
Screen 0: minimum 320 x 200, current 2646 x 1024, maximum 16384 x 16384
LVDS connected primary 1366x768+1280+256 (normal left inverted right x axis y axis) 0mm x 0mm
   1366x768      60.02*+
   1280x720      59.97  
   1152x768      59.95  
   1024x768      59.95  
   800x600       59.96  
   848x480       59.94  
   720x480       59.94  
   640x480       59.94  
HDMI-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
   1280x1024     60.02 +  75.02* 
   1280x960      75.04    60.00  
   1152x864      75.00  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   640x480       75.00    72.81    66.67    59.94  
   720x400       70.08  
VGA-0 disconnected (normal left inverted right x axis y axis)
Can anyone help me, please?
Thank you and have a nice day.
 
Old 03-27-2020, 10:47 PM   #2
mrmazda
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Does this help?:
Code:
xrandr --output HDMI-0 --rate 60
I still don't see that this has been tried.

Last edited by mrmazda; 03-29-2020 at 06:46 AM.
 
Old 03-28-2020, 05:21 AM   #3
Shadow_7
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Some GPUs require firmware to be able to use external monitors. My amd cpu based HP laptop is such a critter. Although on older versions of debian it didn't need it. Package firmware-amd-graphics in the case of debian 10 / buster and said amd gpu/apu.
 
Old 03-29-2020, 05:36 AM   #4
Aicha28
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Quote:
Originally Posted by mrmazda View Post
Does this help?:
Code:
xrandr --output HDMI-0 --rate 60
Can you try a different HDMI to VGA converter or cable?

What does this report?:
Code:
sudo hwinfo --monitor
Does this key sequence have any effect:?
Code:
Ctrl-Alt-F3, Ctrl-Alt-F7
If your GPU is AMD, does adding this at the end of the kernel cmdline in the Grub menu help?:
Code:
amdgpu.dc=0
Thank you for your answer. Here's my output:
Quote:
sudo hwinfo --monitor
Quote:
16: None 00.0: 10000 Monitor
[Created at monitor.125]
Unique ID: rdCR.oIoAda9I5N7
Parent ID: VCu0.NLEZy8AaDF7
Hardware Class: monitor
Model: "EIZO S1901"
Vendor: ENC "EIZO"
Device: eisa 0x1838 "S1901"
Serial ID: "82683099"
Resolution: 720x400@70Hz
Resolution: 640x480@60Hz
Resolution: 640x480@67Hz
Resolution: 640x480@72Hz
Resolution: 640x480@75Hz
Resolution: 800x600@56Hz
Resolution: 800x600@60Hz
Resolution: 800x600@72Hz
Resolution: 800x600@75Hz
Resolution: 832x624@75Hz
Resolution: 1024x768@60Hz
Resolution: 1024x768@70Hz
Resolution: 1024x768@75Hz
Resolution: 1280x1024@75Hz
Resolution: 1280x1024@60Hz
Resolution: 1280x960@60Hz
Resolution: 1280x960@75Hz
Resolution: 1152x864@75Hz
Size: 376x301 mm
Year of Manufacture: 2009
Week of Manufacture: 38
Detailed Timings #0:
Resolution: 1280x1024
Horizontal: 1280 1328 1440 1688 (+48 +160 +408) +hsync
Vertical: 1024 1025 1028 1066 (+1 +4 +42) +vsync
Frequencies: 108.00 MHz, 63.98 kHz, 60.02 Hz
Driver Info #0:
Max. Resolution: 1280x1024
Vert. Sync Range: 50-75 Hz
Hor. Sync Range: 24-80 kHz
Bandwidth: 108 MHz
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #14 (VGA compatible controller)

The key sequence
Code:
Ctrl-Alt-F3, Ctrl-Alt-F7
opens some command line with tty.

I added the line amdgpu.dc=0, but nothing changed.

Last edited by Aicha28; 03-29-2020 at 05:40 AM.
 
Old 03-29-2020, 05:37 AM   #5
Aicha28
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Quote:
Originally Posted by Shadow_7 View Post
Some GPUs require firmware to be able to use external monitors. My amd cpu based HP laptop is such a critter. Although on older versions of debian it didn't need it. Package firmware-amd-graphics in the case of debian 10 / buster and said amd gpu/apu.
I didn't understand what I have to do. Sorry, I am a beginner with Linux.
 
Old 03-29-2020, 06:04 AM   #6
mrmazda
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Quote:
Originally Posted by Aicha28 View Post
Here's my output:
Please, as you did in your post #1 with xrandr, always wrap what you paste here in code tags, to preserve output formatting. You can still do that with responses already made by editing them. Also, include the full command executed as if it was part of the output, so that it is perfectly clear what it is you are pasting output from.

Last edited by mrmazda; 03-29-2020 at 06:38 AM. Reason: to show an example of editing, attempting to induce OP to edit instead of growing the thread
 
Old 03-29-2020, 06:29 AM   #7
Aicha28
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Quote:
Originally Posted by mrmazda View Post
Please, as you did in your post #1 with xrandr, always wrap what you paste here in code tags, to preserve output formatting. You can still do that with responses already made by editing them. Also, include the full command executed as if it was part of the output, so that it is perfectly clear what it is you are pasting output from.
Okey, this is the first time I post in a forum.
Code:
~$ sudo hwinfo --monitor
16: None 00.0: 10000 Monitor                                    
  [Created at monitor.125]
  Unique ID: rdCR.oIoAda9I5N7
  Parent ID: VCu0.NLEZy8AaDF7
  Hardware Class: monitor
  Model: "EIZO S1901"
  Vendor: ENC "EIZO"
  Device: eisa 0x1838 "S1901"
  Serial ID: "82683099"
  Resolution: 720x400@70Hz
  Resolution: 640x480@60Hz
  Resolution: 640x480@67Hz
  Resolution: 640x480@72Hz
  Resolution: 640x480@75Hz
  Resolution: 800x600@56Hz
  Resolution: 800x600@60Hz
  Resolution: 800x600@72Hz
  Resolution: 800x600@75Hz
  Resolution: 832x624@75Hz
  Resolution: 1024x768@60Hz
  Resolution: 1024x768@70Hz
  Resolution: 1024x768@75Hz
  Resolution: 1280x1024@75Hz
  Resolution: 1280x1024@60Hz
  Resolution: 1280x960@60Hz
  Resolution: 1280x960@75Hz
  Resolution: 1152x864@75Hz
  Size: 376x301 mm
  Year of Manufacture: 2009
  Week of Manufacture: 38
  Detailed Timings #0:
     Resolution: 1280x1024
     Horizontal: 1280 1328 1440 1688 (+48 +160 +408) +hsync
       Vertical: 1024 1025 1028 1066 (+1 +4 +42) +vsync
    Frequencies: 108.00 MHz, 63.98 kHz, 60.02 Hz
  Driver Info #0:
    Max. Resolution: 1280x1024
    Vert. Sync Range: 50-75 Hz
    Hor. Sync Range: 24-80 kHz
    Bandwidth: 108 MHz
  Config Status: cfg=new, avail=yes, need=no, active=unknown
  Attached to: #14 (VGA compatible controller)
 
Old 03-29-2020, 06:38 AM   #8
Aicha28
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Quote:
Originally Posted by mrmazda View Post
Please, as you did in your post #1 with xrandr, always wrap what you paste here in code tags, to preserve output formatting. You can still do that with responses already made by editing them. Also, include the full command executed as if it was part of the output, so that it is perfectly clear what it is you are pasting output from.
I guess I know what the problem is, but I don't know how to fix it:

Code:
Output HDMI-0 has no monitor section
How can I add a monitor section to my HDMI-0?

Thank you
 
Old 03-29-2020, 06:42 AM   #9
mrmazda
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Quote:
Originally Posted by Aicha28 View Post
The key sequence
Code:
Ctrl-Alt-F3, Ctrl-Alt-F7
opens some command line with tty.
Right, first sequence switches to a vtty, which presents a login prompt on a black text screen. The next sequence switches back to the desktop screen. I had hoped the switch back would induce the video driver to recognize the second display properly.

Quote:
I added the line amdgpu.dc=0, but nothing changed.
 
Old 03-29-2020, 06:57 AM   #10
Aicha28
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Quote:
Originally Posted by mrmazda View Post
Right, first sequence switches to a vtty, which presents a login prompt on a black text screen. The next sequence switches back to the desktop screen. I had hoped the switch back would induce the video driver to recognize the second display properly.

I tried that again, but none of this worked. I guess the issue is this :
Code:
Output HDMI-0 has no monitor section
According to what I read, I need to add the monitor section in the /etc/X11/xorg.conf file, but I couldn't generate this file no matter what I did ! I guess it could be written manually, but I don't know how to write it!
 
Old 03-29-2020, 07:05 AM   #11
Aicha28
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Quote:
Originally Posted by mrmazda View Post
Does this help?:
Code:
xrandr --output HDMI-0 --rate 60
I still don't see that this has been tried.
I tried it, it was added to the monitors.xml file, this means that it was executed.
 
Old 03-29-2020, 10:26 PM   #12
mrmazda
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Quote:
Originally Posted by Aicha28 View Post
I tried it
Tried it how?
Quote:
it was added to the monitors.xml file, this means that it was executed.
Why do you think either of these? Xrandr is normally run from within an X session in a terminal, or through some startup script. I'm unaware of any X startup scripting having anything to do with any .xml file(s).

Have you tried running it from a GUI terminal first to see if it has any effect?
 
Old 04-01-2020, 10:59 PM   #13
Shadow_7
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Quote:
Originally Posted by Aicha28 View Post
I didn't understand what I have to do. Sorry, I am a beginner with Linux.
In my case:

$ sudo apt-get install firmware-amd-graphics

Otherwise I could NOT log in using an external display. As only the laptops LCD would show visuals.
 
  


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