#StackBounty: #windows-10 #graphics-card #display #multiple-monitors Cannot change "Active Signal Resolution"

Bounty: 100

I have a (First 301 GD Live) monitor with a 2560×1600 native resolution that intermittently fails to identify itself properly to windows. I have just moved to a new office and when trying to get started again the monitor is just not being recognized. Windows just says it’s a "DVI" monitor. Windows now shows that the "recommended" resolution is 1280×800. If I go to advanced display settings and list all modes and then select 2560×1600/60Hz then the "desktop resolution" becomes 2560×1600 but the Active Signal Resolution remains at 1280×800 and the picture is horrid – like an upscaled low resolution image.

I tried setting the resolution via the NVIDIA Control Panel to 2560×1600 but the Active Signal Resolution remains at 1280×800 and so the picture is still awful.

I also tried power cycling the monitor itself several times to no avail (this had helped in the past).

My graphics card is a GeForce GTX 1650 Super.

Is it possible to instruct the graphics card to send out a 2560×1600 signal that you specify, regardless of whatever monitor the computer thinks is at the other end of the cable?


Get this bounty!!!

#StackBounty: #windows-10 #graphics-card #display #multiple-monitors #resolution Win10 display settings 'Duplicate mode' interf…

Bounty: 50

I am gamer/programmer on Windows 10 64 bit Pro edition who plays/works at 1920 x 1080 resolution with the need to minimize my game to get to windows which is running at the same resolution. I am using 2 insignia monitors in ‘Duplicate’ mode with a GTX 970 Nvidia Graphics GPU

The issue I am having is that my monitors are receiving a resolution switch signal each time I make the switch from game to desktop or vice versa, despite that the game is played in 1080p and that the desktop resolution is also 1080p.

To understand this further you should understand that when I normally change resolutions in Windows, my TV produces an OSD showing which resolution is in effect. While this is considered normal behavior for the TVs that I am using while switching resolutions are waking from sleep, it is not normal when the resolution is not actually changing and that the devices are already on. Here is a shot of the OSD that pops up when I switch to game in the same resolution as the desktop:

enter image description here

After doing some testing I came to realize that the issue does not happen on either monitor when only one monitor is selected in the display settings (either when PC screen Only or Secondary screen only are selected). If Duplicate mode is enabled the issue is persistent.

enter image description here

So what I would like to understand (and correct if possible), is how Windows 10 and my GPU are handling the different monitor setups. There must be some technical explanation for why my hardware (monitors) are behaving differently in these different Windows monitor modes.
I would like to keep Duplicate mode enabled so I dont have to constantly switch between setups to accommodate this issue.


Get this bounty!!!

#StackBounty: #windows-10 #graphics-card #display #multiple-monitors #resolution Win10 display settings 'Duplicate mode' interf…

Bounty: 50

I am gamer/programmer on Windows 10 64 bit Pro edition who plays/works at 1920 x 1080 resolution with the need to minimize my game to get to windows which is running at the same resolution. I am using 2 insignia monitors in ‘Duplicate’ mode with a GTX 970 Nvidia Graphics GPU

The issue I am having is that my monitors are receiving a resolution switch signal each time I make the switch from game to desktop or vice versa, despite that the game is played in 1080p and that the desktop resolution is also 1080p.

To understand this further you should understand that when I normally change resolutions in Windows, my TV produces an OSD showing which resolution is in effect. While this is considered normal behavior for the TVs that I am using while switching resolutions are waking from sleep, it is not normal when the resolution is not actually changing and that the devices are already on. Here is a shot of the OSD that pops up when I switch to game in the same resolution as the desktop:

enter image description here

After doing some testing I came to realize that the issue does not happen on either monitor when only one monitor is selected in the display settings (either when PC screen Only or Secondary screen only are selected). If Duplicate mode is enabled the issue is persistent.

enter image description here

So what I would like to understand (and correct if possible), is how Windows 10 and my GPU are handling the different monitor setups. There must be some technical explanation for why my hardware (monitors) are behaving differently in these different Windows monitor modes.
I would like to keep Duplicate mode enabled so I dont have to constantly switch between setups to accommodate this issue.


Get this bounty!!!

#StackBounty: #windows-10 #graphics-card #display #multiple-monitors #resolution Win10 display settings 'Duplicate mode' interf…

Bounty: 50

I am gamer/programmer on Windows 10 64 bit Pro edition who plays/works at 1920 x 1080 resolution with the need to minimize my game to get to windows which is running at the same resolution. I am using 2 insignia monitors in ‘Duplicate’ mode with a GTX 970 Nvidia Graphics GPU

The issue I am having is that my monitors are receiving a resolution switch signal each time I make the switch from game to desktop or vice versa, despite that the game is played in 1080p and that the desktop resolution is also 1080p.

To understand this further you should understand that when I normally change resolutions in Windows, my TV produces an OSD showing which resolution is in effect. While this is considered normal behavior for the TVs that I am using while switching resolutions are waking from sleep, it is not normal when the resolution is not actually changing and that the devices are already on. Here is a shot of the OSD that pops up when I switch to game in the same resolution as the desktop:

enter image description here

After doing some testing I came to realize that the issue does not happen on either monitor when only one monitor is selected in the display settings (either when PC screen Only or Secondary screen only are selected). If Duplicate mode is enabled the issue is persistent.

enter image description here

So what I would like to understand (and correct if possible), is how Windows 10 and my GPU are handling the different monitor setups. There must be some technical explanation for why my hardware (monitors) are behaving differently in these different Windows monitor modes.
I would like to keep Duplicate mode enabled so I dont have to constantly switch between setups to accommodate this issue.


Get this bounty!!!

#StackBounty: #windows-10 #graphics-card #display #multiple-monitors #resolution Win10 display settings 'Duplicate mode' interf…

Bounty: 50

I am gamer/programmer on Windows 10 64 bit Pro edition who plays/works at 1920 x 1080 resolution with the need to minimize my game to get to windows which is running at the same resolution. I am using 2 insignia monitors in ‘Duplicate’ mode with a GTX 970 Nvidia Graphics GPU

The issue I am having is that my monitors are receiving a resolution switch signal each time I make the switch from game to desktop or vice versa, despite that the game is played in 1080p and that the desktop resolution is also 1080p.

To understand this further you should understand that when I normally change resolutions in Windows, my TV produces an OSD showing which resolution is in effect. While this is considered normal behavior for the TVs that I am using while switching resolutions are waking from sleep, it is not normal when the resolution is not actually changing and that the devices are already on. Here is a shot of the OSD that pops up when I switch to game in the same resolution as the desktop:

enter image description here

After doing some testing I came to realize that the issue does not happen on either monitor when only one monitor is selected in the display settings (either when PC screen Only or Secondary screen only are selected). If Duplicate mode is enabled the issue is persistent.

enter image description here

So what I would like to understand (and correct if possible), is how Windows 10 and my GPU are handling the different monitor setups. There must be some technical explanation for why my hardware (monitors) are behaving differently in these different Windows monitor modes.
I would like to keep Duplicate mode enabled so I dont have to constantly switch between setups to accommodate this issue.


Get this bounty!!!

#StackBounty: #windows-10 #graphics-card #display #multiple-monitors #resolution Win10 display settings 'Duplicate mode' interf…

Bounty: 50

I am gamer/programmer on Windows 10 64 bit Pro edition who plays/works at 1920 x 1080 resolution with the need to minimize my game to get to windows which is running at the same resolution. I am using 2 insignia monitors in ‘Duplicate’ mode with a GTX 970 Nvidia Graphics GPU

The issue I am having is that my monitors are receiving a resolution switch signal each time I make the switch from game to desktop or vice versa, despite that the game is played in 1080p and that the desktop resolution is also 1080p.

To understand this further you should understand that when I normally change resolutions in Windows, my TV produces an OSD showing which resolution is in effect. While this is considered normal behavior for the TVs that I am using while switching resolutions are waking from sleep, it is not normal when the resolution is not actually changing and that the devices are already on. Here is a shot of the OSD that pops up when I switch to game in the same resolution as the desktop:

enter image description here

After doing some testing I came to realize that the issue does not happen on either monitor when only one monitor is selected in the display settings (either when PC screen Only or Secondary screen only are selected). If Duplicate mode is enabled the issue is persistent.

enter image description here

So what I would like to understand (and correct if possible), is how Windows 10 and my GPU are handling the different monitor setups. There must be some technical explanation for why my hardware (monitors) are behaving differently in these different Windows monitor modes.
I would like to keep Duplicate mode enabled so I dont have to constantly switch between setups to accommodate this issue.


Get this bounty!!!

#StackBounty: #windows-10 #graphics-card #display #multiple-monitors #resolution Win10 display settings 'Duplicate mode' interf…

Bounty: 50

I am gamer/programmer on Windows 10 64 bit Pro edition who plays/works at 1920 x 1080 resolution with the need to minimize my game to get to windows which is running at the same resolution. I am using 2 insignia monitors in ‘Duplicate’ mode with a GTX 970 Nvidia Graphics GPU

The issue I am having is that my monitors are receiving a resolution switch signal each time I make the switch from game to desktop or vice versa, despite that the game is played in 1080p and that the desktop resolution is also 1080p.

To understand this further you should understand that when I normally change resolutions in Windows, my TV produces an OSD showing which resolution is in effect. While this is considered normal behavior for the TVs that I am using while switching resolutions are waking from sleep, it is not normal when the resolution is not actually changing and that the devices are already on. Here is a shot of the OSD that pops up when I switch to game in the same resolution as the desktop:

enter image description here

After doing some testing I came to realize that the issue does not happen on either monitor when only one monitor is selected in the display settings (either when PC screen Only or Secondary screen only are selected). If Duplicate mode is enabled the issue is persistent.

enter image description here

So what I would like to understand (and correct if possible), is how Windows 10 and my GPU are handling the different monitor setups. There must be some technical explanation for why my hardware (monitors) are behaving differently in these different Windows monitor modes.
I would like to keep Duplicate mode enabled so I dont have to constantly switch between setups to accommodate this issue.


Get this bounty!!!

#StackBounty: #windows-10 #graphics-card #display #multiple-monitors #resolution Win10 display settings 'Duplicate mode' interf…

Bounty: 50

I am gamer/programmer on Windows 10 64 bit Pro edition who plays/works at 1920 x 1080 resolution with the need to minimize my game to get to windows which is running at the same resolution. I am using 2 insignia monitors in ‘Duplicate’ mode with a GTX 970 Nvidia Graphics GPU

The issue I am having is that my monitors are receiving a resolution switch signal each time I make the switch from game to desktop or vice versa, despite that the game is played in 1080p and that the desktop resolution is also 1080p.

To understand this further you should understand that when I normally change resolutions in Windows, my TV produces an OSD showing which resolution is in effect. While this is considered normal behavior for the TVs that I am using while switching resolutions are waking from sleep, it is not normal when the resolution is not actually changing and that the devices are already on. Here is a shot of the OSD that pops up when I switch to game in the same resolution as the desktop:

enter image description here

After doing some testing I came to realize that the issue does not happen on either monitor when only one monitor is selected in the display settings (either when PC screen Only or Secondary screen only are selected). If Duplicate mode is enabled the issue is persistent.

enter image description here

So what I would like to understand (and correct if possible), is how Windows 10 and my GPU are handling the different monitor setups. There must be some technical explanation for why my hardware (monitors) are behaving differently in these different Windows monitor modes.
I would like to keep Duplicate mode enabled so I dont have to constantly switch between setups to accommodate this issue.


Get this bounty!!!

#StackBounty: #drivers #graphics-card #gpu #nvidia-graphics-card #cuda Why peer-to-peer (P2P) access between two Tesla K40c GPUs fails …

Bounty: 50

I would like to run a CUDA C program using two Tesla K40 devices and enable peer-to-peer (P2P) between them as my data will be shared among the devices. My computer has the following deviceQuery summary and NVIDIA-smi results (OS: Windows 10).

deviceQuery:

Device 0: "Tesla K40c"
CUDA Driver Version / Runtime Version          10.2 / 10.2
CUDA Device Driver Mode (TCC or WDDM):         TCC
Device PCI Domain ID / Bus ID / location ID:   0 / 21 / 0

Device 1: "Tesla K40c"
CUDA Driver Version / Runtime Version          10.2 / 10.2
CUDA Device Driver Mode (TCC or WDDM):         TCC
Device PCI Domain ID / Bus ID / location ID:   0 / 45 / 0

Device 2: "Quadro P400"
CUDA Driver Version / Runtime Version          10.2 / 10.2
CUDA Device Driver Mode (TCC or WDDM):         WDDM
Device PCI Domain ID / Bus ID / location ID:   0 / 153 / 0

Nvidia-smi:

+-----------------------------------------------------------------------------+
| NVIDIA-SMI 441.22       Driver Version: 441.22       CUDA Version: 10.2     |
|-------------------------------+----------------------+----------------------+
| GPU  Name            TCC/WDDM | Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  Tesla K40c          TCC  | 00000000:15:00.0 Off |                    0 |
| 23%   36C    P8    24W / 235W |    809MiB / 11448MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+
|   1  Tesla K40c          TCC  | 00000000:2D:00.0 Off |                  Off |
| 23%   43C    P8    24W / 235W |    809MiB / 12215MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+
|   2  Quadro P400        WDDM  | 00000000:99:00.0  On |                  N/A |
| 34%   35C    P8    N/A /  N/A |    449MiB /  2048MiB |     14%      Default |
+-------------------------------+----------------------+----------------------+

I make the Quadro P400 invisible to my CUDA program via set CUDA_VISIBLE_DEVICES=0,1 and run the SimpleP2P example. The P2P example runs successfully but the results indicate that there is a P2P issue here. Specifically, the memcpy speed shows only about 0.2 GB/s despite the fact that the Tesla devices are connected to two PCIe3 x16 CPU0 slots:

Checking for multiple GPUs...
CUDA-capable device count: 2
Checking GPU(s) for support of peer to peer memory access...
> Peer access from Tesla K40c (GPU0) -> Tesla K40c (GPU1) : Yes
> Peer access from Tesla K40c (GPU1) -> Tesla K40c (GPU0) : Yes
Enabling peer access between GPU0 and GPU1...
Allocating buffers (64MB on GPU0, GPU1 and CPU Host)...
Creating event handles...
cudaMemcpyPeer / cudaMemcpy between GPU0 and GPU1: 0.19GB/s
Preparing host buffer and memcpy to GPU0...
Run kernel on GPU1, taking source data from GPU0 and writing to GPU1...
Run kernel on GPU0, taking source data from GPU1 and writing to GPU0...
Copy data back to host from GPU0 and verify results...
Disabling peer access...
Shutting down...
Test passed

The SimpleP2P example also fails when I modify the code slightly to examine the P2P performance deeper (please see this question for programming details if you find them relevant). The tests I have done and the comments of a few experts on my post here indicate that the problem is a system/platform issue. My motherboard is an HP 81C7 with a BIOS version of v02.47 (up to date as of Apr/11/2020). I have also installed Nvidia driver and CUDA several times and have tried CUDA 10.1 as well but with no luck. Can someone shed some light on how I can dig into the problem more and find the source of the problem?


Get this bounty!!!

#StackBounty: #windows #graphics-card #multiple-monitors #hdmi #tv How to enable TV display with MultiMonitorTool or similar?

Bounty: 50

I have two monitors and one TV connected to same computer with Windows 10.

enter image description here

An image I found online to describe the setup

I know I can choose to extend or duplicate, or not, to second screen doing WIN + P, but that doesn’t work for the TV as it is a third display.

I would really like a shortcut so I dont have to open display setting each time I want to use the TV as display.

My computer is a laptop with Intel HD 630 + Nvidia GT 1050 Ti but Im pretty sure it only uses the HD 630 normally. It also has an external graphics card usb hub using DisplayLink drivers. TV is connected to HDMI on laptop while two monitors are connected via the external hub. The TV is a Samsung smart TV.

With the freeware MultiMonitorTool it’s quite easy to make a command line command that I can save as a shortcut that disables the TV:

enter image description here

MultiMonitorTool.exe /disable 1

This disables the display perfectly just as I want. (1 being the monitor number of the TV)

Unfortunately the TV display can not be enabled again via command line using MultiMonitorTool for some reason using:

MultiMonitorTool.exe /enable 1

If I run the enable command nothing happens.

(When making tests on other two monitors I can enable them with this command so its a problem that is specific for the TV)

If I manually open Windows display settings I can select the display, scroll down and choose “Extend to this display” to enable it.

enter image description here

I open display settings and there it is…

enter image description here

Selecting “Extend…” enables the TV display again

enter image description here

Now the display is enabled, and can be disabled with the shortcut again

My question is, why doesnt it work to enable the TV and what can I do to enable it via command line instead of having to go to settings each time?


Get this bounty!!!