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Question Solved Samsung External Monitor Black Screen

handra

New member
Jul 19, 2020
3
0
4
35
Hi,

I'm using PopOS 20.04 on Lenovo Thinkpad X1 Extreme G2. Currently, I'm attaching my external monitor (Samsung) to the HDMI port. Based on the syslog, the monitor is indeed detected, however I only get blank screen as if nothing happened.

Below are the logs I received from the Syslog when plugging-in the HDMI cable:
Jul 19 17:03:19 localhost /usr/lib/gdm3/gdm-x-session[1885]: (--) NVIDIA(GPU-0): Samsung S19E310 (DFP-2): connected
Jul 19 17:03:19 localhost /usr/lib/gdm3/gdm-x-session[1885]: (--) NVIDIA(GPU-0): Samsung S19E310 (DFP-2): Internal TMDS
Jul 19 17:03:19 localhost /usr/lib/gdm3/gdm-x-session[1885]: (--) NVIDIA(GPU-0): Samsung S19E310 (DFP-2): 600.0 MHz maximum pixel clock
Jul 19 17:03:19 localhost /usr/lib/gdm3/gdm-x-session[1885]: (--) NVIDIA(GPU-0):
Jul 19 17:03:19 localhost /usr/lib/gdm3/gdm-x-session[1885]: (II) modeset(0): EDID vendor "CMN", prod id 5388
Jul 19 17:03:19 localhost /usr/lib/gdm3/gdm-x-session[1885]: (II) modeset(0): DDCModeFromDetailedTiming: Ignoring tiny 837x0 mode
Jul 19 17:03:19 localhost /usr/lib/gdm3/gdm-x-session[1885]: (II) modeset(0): Printing DDC gathered Modelines:
Jul 19 17:03:19 localhost /usr/lib/gdm3/gdm-x-session[1885]: (II) modeset(0): Modeline "1920x1080"x0.0 138.78 1920 2000 2054 2080 1080 1086 1094 1112 -hsync -vsync (66.7 kHz eP)
Jul 19 17:03:23 localhost /usr/lib/gdm3/gdm-x-session[1885]: (II) modeset(0): EDID vendor "CMN", prod id 5388
Jul 19 17:03:23 localhost /usr/lib/gdm3/gdm-x-session[1885]: (II) modeset(0): DDCModeFromDetailedTiming: Ignoring tiny 837x0 mode
Jul 19 17:03:23 localhost /usr/lib/gdm3/gdm-x-session[1885]: (II) modeset(0): Printing DDC gathered Modelines:
Jul 19 17:03:23 localhost /usr/lib/gdm3/gdm-x-session[1885]: (II) modeset(0): Modeline "1920x1080"x0.0 138.78 1920 2000 2054 2080 1080 1086 1094 1112 -hsync -vsync (66.7 kHz eP)
Below logs I received at Xorg.0.log file:
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 7.039] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[ 7.039] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist.
[ 7.039] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.
[ 7.040] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist.
[ 7.040] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
[ 7.200] (WW) Falling back to old probe method for fbdev
[ 7.742] (WW) NVIDIA(G0): Unable to get display device for DPI computation.
[ 8.048] (II) Initializing extension MIT-SCREEN-SAVER
I booted my laptop to Windows to test, and the Samsung monitor is recognised and working correctly, so it's safe to assume that the hardware side is OK.

Below is my sytem details:
///////////// handra@nebula
///////////////////// -------------
///////*767//////////////// OS: Pop!_OS 20.04 LTS x86_64
//////7676767676*////////////// Host: 20QVCTO1WW ThinkPad X1 Extreme 2nd
/////76767//7676767////////////// Kernel: 5.4.0-7634-generic
/////767676///*76767/////////////// Uptime: 10 mins
///////767676///76767.///7676*/////// Packages: 2087 (dpkg), 17 (flatpak)
/////////767676//76767///767676//////// Shell: fish 3.1.0
//////////76767676767////76767///////// Resolution: 1920x1080
///////////76767676//////7676////////// DE: GNOME
////////////,7676,///////767/////////// WM: Mutter
/////////////*7676///////76//////////// WM Theme: Pop
///////////////7676//////////////////// Theme: Pop-dark [GTK2/3]
///////////////7676///767//////////// Icons: Pop [GTK2/3]
//////////////////////'//////////// Terminal: gnome-terminal
//////.7676767676767676767,////// CPU: Intel i7-9850H (12) @ 4.600GHz
/////767676767676767676767///// GPU: NVIDIA GeForce GTX 1650 Mobile / Max-Q
/////////////////////////// GPU: Intel UHD Graphics 630
///////////////////// Memory: 4295MiB / 15618MiB
/////////////
Please help on what could go wrong and let me know if you need more information.

Thank you
 

handra

New member
Jul 19, 2020
3
0
4
35
OK, it turned out I was using hybrid graphics mode. I changed to use Nvidia exclusively then my second monitor can be recognised. Thanks for the help.
 

derpOmattic

Pop!_Muse
Trusted User
Founding Member
Nov 23, 2018
1,400
234
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www.patreon.com
Some links I found to investigate.



Lenovo X1 seems to be especially problematic with Linux integration in general. This might sound a bit weird, (it does to me), but it looks like most of the instances of this problem I can find are solved by either ensuring to be in discreet graphics, or changing the cable, even if the cable works on other devices.
 
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