nVidia, multiple displays, inability to extend current screen

WizadNoNext · 04-27-2019, 04:09 PM

As in subject
I have nVidia GeForce GTX 960
I have 2 Dell 3008WFP Monitor (2560x1600) connected via DisplayPort and single Apple Cinema 23" (1920x1200) connected via DVI-D
They are arranged (both physically and logically - in software) as a horizontal strip with Apple Cinema on right anf Dell 3008WFP on left, each displaying its own set of pixels - no overlapping. The X screen have size of 7040x1600

My observation
There is no way to extend X screen to any bigger size, then to what it was downgraded by any means either software (like game or via changing screen resolution or monitor layout) or hardware (by either turning of any of DisplayPort connected monitors or by unplugging). This does happen ONLY when 2 DisplayPort connected monitors are present (maybe more - not checked due to having only 2 DisplayPort monitors). This is direct connection, no MST is involved.
This did not happen, when there was single DisplayPort connected monitor

To resolve problem I need to unload nvidia driver - restarting X does not help at all.
After reloading driver I need to configure layout and then restart X server, otherwise it won't work as I wish it.
I do nothing fancy - I just need a lot of screen estate to be able to see more windows at the same time

At best I am watching YouTube at 1440p

At the moment I am pretty convinced that nvidia driver is a problem, as this happened twice today and computer restart have resolved it in first instance. Second time I simply tried reloading nvidia driver, which got same result.

I am going to write to nvidia, as this stolen good hour of my day today

By the way - first instance of having this problem was just turning off both DisplayPort monitors. After turning them back on I could not get my monitor layout to work at all.

mrmazda · 04-27-2019, 08:42 PM

Quote:

Originally Posted by WizadNoNext

There is no way to extend X screen to any bigger size, then to what it was downgraded by any means either software (like game or via changing screen resolution or monitor layout) or hardware (by either turning of any of DisplayPort connected monitors or by unplugging).

I don't understand what you are asking. This is what I get automatically with an Acer left, Dell center, and NEC right, each connected to a discrete DisplayPort, all using the same default DDX:

Code:

# inxi -GxxS
System:    Host: fi965 Kernel: 4.12.14-lp151.22-default x86_64 bits: 64 compiler: gcc v: 7.4.0 Desktop: Trinity R14.0.5
           tk: Qt 3.5.0 wm: Twin dm: startx Distro: openSUSE Leap 15.1 Beta
Graphics:  Device-1: Advanced Micro Devices [AMD/ATI] RV620 PRO [Radeon HD 3470] vendor: Dell driver: radeon v: kernel
           bus ID: 01:00.0 chip ID: 1002:95c0
           Device-2: Advanced Micro Devices [AMD/ATI] Oland [Radeon HD 8570 / R7 240/340 OEM] vendor: Dell driver: radeon
           v: kernel bus ID: 04:00.0 chip ID: 1002:6611
           Display: server: X.Org 1.20.3 driver: modesetting resolution: 2560x1440~60Hz, 2560x1080~60Hz, 1920x1200~60Hz
           OpenGL: renderer: AMD RV620 (DRM 2.50.0 / 4.12.14-lp151.22-default LLVM 7.0.1) v: 3.3 Mesa 18.3.2 compat-v: 3.0
           direct render: Yes
# xrandr | grep -B1 -A3 DP
Screen 0: minimum 320 x 200, current 7040 x 2640, maximum 8192 x 8192
DP-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 598mm x 336mm
   2560x1440     59.95*+  74.92
   1920x1440     75.00
   1856x1392     75.00
--
   720x400       70.08
DP-2 connected 2560x1080+2560+0 (normal left inverted right x axis y axis) 673mm x 284mm
   2560x1080     60.00*+
   1920x1080     59.96    60.00    60.00    50.00    59.94    59.93    24.00    23.98
   1920x1080i    60.00    50.00    59.94
--
   320x180       59.84    59.32
DP-1-3 connected 1920x1200+5120+0 (normal left inverted right x axis y axis) 519mm x 324mm
   1920x1200     59.95*+
   1920x1080     59.96    60.00    59.94    59.93
   1600x1200     60.00

lleb · 04-28-2019, 01:22 PM

would love more details, just ordered 2 Acer 32in monitors that will be connected GTX1070 via displayport connection with my Fedora 29 workstation.

I really hope I did not spend all that $$$ for a solution that will not function properly under Linux.

mrmazda · 04-28-2019, 10:59 PM

Quote:

Originally Posted by lleb

would love more details

What kind of details? It simply works here, using only FOSS, and AMD. I don't have any NVidia DisplayPorts, only one HDMI, several DVI, and several VGA.

Here's another 7040x1440, using Intel GPU, MST, FOSS DDX, and no screen/display customizing:

Code:

# cat /pub/tmp/out
# inxi -GxxS
System:    Host: gb250 Kernel: 4.12.14-lp151.23-default x86_64 bits: 64 compiler: gcc v: 7.4.0 Desktop: Trinity R14.0.6
           tk: Qt 3.5.0 wm: Twin dm: startx Distro: openSUSE Leap 15.1 Beta
Graphics:  Device-1: Intel HD Graphics 630 vendor: Gigabyte driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:5912
           Display: server: X.Org 1.20.3 driver: modesetting unloaded: fbdev,vesa alternate: intel
           resolution: 2560x1440~60Hz, 2560x1080~60Hz, 1920x1200~60Hz
           OpenGL: renderer: Mesa DRI Intel HD Graphics 630 (Kaby Lake GT2) v: 4.5 Mesa 18.3.2 compat-v: 3.0
           direct render: Yes
# xrandr | egrep -B1 -A3 'DP|HDMI'
Screen 0: minimum 320 x 200, current 7040 x 1440, maximum 8192 x 8192
HDMI-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 598mm x 336mm
   2560x1440     59.95*+  69.93
   1920x1080     60.00    60.00    50.00    59.94    24.00    23.98
   1920x1080i    60.00    60.00    50.00    59.94
--
   720x400       70.08
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-3 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-1-8 connected 2560x1080+2560+0 (normal left inverted right x axis y axis) 673mm x 284mm
   2560x1080     60.00*+
   1920x1080     60.00    60.00    50.00    59.94    24.00    23.98
   1680x1050     59.95
--
   720x400       70.08
DP-1-1 connected 1920x1200+5120+0 (normal left inverted right x axis y axis) 519mm x 324mm
   1920x1200     59.95*+
   1920x1080     60.00    59.94
   1680x1050     59.95