Hi guys,

I just bought a Lenovo IdeaPad C340 and an external monitor to use for work. However, the monitor is not working. It is running KDE Neon (Ubuntu 18.04)
First of all, I tested the cable in another notebook and it worked. I tested the monitor in another computer and it is also working.

My concern is that xrandr is not listing the HDMI port:

Code: Select all

$ xrandr     
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 173mm
   1920x1080     60.01*+  60.01    59.97    59.96    59.93 
   1680x1050     59.95    59.88 
   1600x1024     60.17 
   1400x1050     59.98 
   1600x900      59.99    59.94    59.95    59.82 
   1280x1024     60.02 
   1440x900      59.89 
   1400x900      59.96    59.88 
   1280x960      60.00 
   1440x810      60.00    59.97 
   1368x768      59.88    59.85 
   1360x768      59.80    59.96 
   1280x800      59.99    59.97    59.81    59.91 
   1152x864      60.00 
   1280x720      60.00    59.99    59.86    59.74 
   1024x768      60.04    60.00 
   960x720       60.00 
   928x696       60.05 
   896x672       60.01 
   1024x576      59.95    59.96    59.90    59.82 
   960x600       59.93    60.00 
   960x540       59.96    59.99    59.63    59.82 
   800x600       60.00    60.32    56.25 
   840x525       60.01    59.88 
   864x486       59.92    59.57 
   800x512       60.17 
   700x525       59.98 
   800x450       59.95    59.82 
   640x512       60.02 
   720x450       59.89 
   700x450       59.96    59.88 
   640x480       60.00    59.94 
   720x405       59.51    58.99 
   684x384       59.88    59.85 
   680x384       59.80    59.96 
   640x400       59.88    59.98 
   576x432       60.06 
   640x360       59.86    59.83    59.84    59.32 
   512x384       60.00 
   512x288       60.00    59.92 
   480x270       59.63    59.82 
   400x300       60.32    56.34 
   432x243       59.92    59.57 
   320x240       60.05 
   360x202       59.51    59.13 
   320x180       59.84    59.32 
DP-1 disconnected (normal left inverted right x axis y axis)


I had to change a few setting in the BIOS to the able to install KDE Neon. Could this be the issue?
I have no idea of what to do next...

Hi!
I have the same problem with an asus laptop with ryzen5 3550, according of i had been reading is a problem with kernel, the only solution i found is updated the kernel to 5.4 but i do not try it yet, no until the next week. I will post the results.
If you have any update, please, post a reply.
Salud!

5.4???
I sincerely hope your are wrong!

What is your graphic card?
Mine is an "Intel® UHD Graphics" integrated.

Hi!
I have 2 graphics cards, amd vega 8 integrated and NVIDIA 1050 dedicated. In my case is a problem with ryzen5 3x and kernel.
Can you tell me what changes did you do on bios? Maybe is a different problem.
Salud!

The basic... Settings related to UEFI and AHPCI.

The HDMI port had a physical defect. Problem solved!