From nouveau to nvidia and lost monitor

Stragonian · 11-17-2020, 09:55 AM

Greetings
I recently switched from using the nouveau to the nvidia drivers, and now the only way I can get my top monitor ( smart TV LG 43UJ6200 ) to detected is by unplugging the DP-1 cable in the back, and plugging it back into the card.

When I used the nouveau drivers the LG 43UJ6200 would detect the signal and turn on during the boot, when the nouveau driver would modeset while booting in the terminal.

Both the top and bottom monitors would then display cloned screens, until I logged in, and typed startx at the terminal, at which time I had an xrandr command that would automatically set the monitors in their orientation.

DVI-I-1 as the primary display at the bottom, and the LG 43UJ6200 as the secondary display on top.

Code:

xrandr --output DVI-I-1 --primary --mode 1920x1080 --pos 0x1080 --output DP-1 --mode 1920x1080 --pos 0x0

Now I have to crawl under my desk, and unplug the DP-1 cable and plug it back into the video card in order for the LG 43UJ6200 to detect a signal, and work.

ButterflyMelissa · 11-18-2020, 07:31 AM

Hi,
Some info, please. How do you connect witht he monitors? HDMI?
What card?
Thank you
Your question is interesting to say the least...
Melissa

teckk · 11-18-2020, 11:24 AM

General info for nvidia and multihead
https://wiki.archlinux.org/index.php/Multihead
https://wiki.archlinux.org/index.php/Nvidia
https://wiki.archlinux.org/index.php/Nouveau

Stragonian · 11-18-2020, 12:24 PM

ButterflyMelissa ...

Code:

# lspci -nn -d 10de:
03:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF100GL [Quadro 4000] [10de:06dd] (rev a1)
03:00.1 Audio device [0403]: NVIDIA Corporation GF110 High Definition Audio Controller [10de:0e09] (rev a1)

The card has 2 Display Ports, and one DVI port, my primary monitor is attached to the DVI port, and the LG 43UJ6200, is attached by a Display Ports to HDMI cable.

It has to be a problem in the software, as the nouveau drivers worked just fine to activate the LG 43UJ6200 during the boot process.

mrmazda · 11-19-2020, 01:58 AM

Quote:

Originally Posted by Stragonian

It has to be a problem in the software, as the nouveau drivers worked just fine to activate the LG 43UJ6200 during the boot process.

Only the kernel's nouveau works during the boot process. When X starts there is an additional driver required just to get X started. This primer explains. Did you consider using the upstream default DDX driver prior to tainting the kernel with proprietary software? Pure FOSS works fine for my NVS NVidia:

Code:

# inxi -GISay
System:
  Host: p5bse Kernel: 4.19.0-11-amd64 x86_64 bits: 64 compiler: gcc v: 8.3.0
  parameters: mitigations=auto consoleblank=0 plymouth.enable=0 vga=791 video=1440x900@60
  Desktop: Trinity R14.0.9 tk: Qt 3.5.0 info: kicker wm: Twin 3.0 dm: startx
  Distro: Debian GNU/Linux 10 (buster)
Graphics:
  Device-1: NVIDIA GF119 [NVS 310] vendor: Hewlett-Packard driver: nouveau
  v: kernel bus ID: 01:00.0 chip ID: 10de:107d
  Display: server: X.Org 1.20.4 driver: modesetting unloaded: fbdev,vesa
  display ID: :0 screens: 1
  Screen-1: 0 s-res: 2560x2520 s-dpi: 120 s-size: 541x533mm (21.3x21.0")
  s-diag: 759mm (29.9")
  Monitor-1: DP-1 res: 2560x1440 hz: 60 dpi: 109 size: 598x336mm (23.5x13.2")
  diag: 686mm (27")
  Monitor-2: DP-2 res: 2560x1080 hz: 60 dpi: 97 size: 673x284mm (26.5x11.2")
  diag: 730mm (28.8")
  OpenGL: renderer: NVD9 v: 4.3 Mesa 18.3.6 direct render: Yes
Info:...Shell: Bash v: 5.0.3 running in: konsole inxi: 3.1.09
# xrandr | egrep 'onnect|creen|\*' | grep -v disconn | sort -r
Screen 0: minimum 320 x 200, current 2560 x 2520, maximum 16384 x 16384
DP-2 connected 2560x1080+0+0 (normal left inverted right x axis y axis) 673mm x 284mm
DP-1 connected primary 2560x1440+0+1080 (normal left inverted right x axis y axis) 598mm x 336mm
   2560x1440     59.95*+  74.92
   2560x1080     60.00*+

Do you have another DisplayPort to HDMI cable or adapter that you can try? Too bad the LG has no DisplayPort input. In a PC environment, DP is sometimes better suited than HDMI, rather than approximate equals. My 43" LG had a DP and a USB-C to go with its 4 HDMI ports, nice features to have, but unfortunately, outweighed by uncorrectable faults, and returned to vendor.

Herve5 · 11-19-2020, 06:10 AM

Which kernel are you using?
Here on Debian the transition from 5.8 to 5.9 basically killed the NVidia drivers a couple of weeks ago, then NVidia updated them just days ago and they went fine save the fact using the GPU with OpenCL does not work anymore, then the 5.9 kernel was slighthy re-updated but apparently the situation stays the same.
At this moment if I want to perform large image processing I need to reboot in 5.8 or be slower...
H.