Re: Wddm Driver For Win 7 Pro
Tanja Freeze
It is a replacement for the previous Windows 2000 and Windows XP display driver model XDDM/XPDM[3] and is aimed at enabling better performance graphics and new graphics functionality and stability.[2] Display drivers in Windows Vista and Windows 7 can choose to either adhere to WDDM or to XDDM.[4] With the removal of XDDM from Windows 8, however, WDDM became the only option.[5]
WDDM provides the functionality required to render the desktop and applications using Desktop Window Manager, a compositing window manager running on top of Direct3D. It also supports new DXGI interfaces required for basic device management and creation. The WDDM specification requires at least Direct3D 9-capable video card and the display driver must implement the device driver interfaces for the Direct3D 9Ex runtime in order to run legacy Direct3D applications; it may optionally implement runtime interfaces for Direct3D 10 and higher.
In the context of graphics, virtualization means that individual processes (in user mode) cannot see the memory of adjacent processes even by means of insertion of forged commands in the command stream. WDDM drivers allow video memory to be virtualized,[6] and video data to be paged out of video memory into system RAM. In case the video memory available turns out to be insufficient to store all the video data and textures, currently unused data is moved out to system RAM or to the disk. When the swapped out data is needed, it is fetched back. Virtualization could be supported on previous driver models (such as the XP Driver Model) to some extent, but was the responsibility of the driver, instead of being handled at the runtime level.
The runtime handles scheduling of concurrent graphics contexts.[7] Each list of commands is put in a queue for execution by the GPU, and it can be preempted by the runtime if a more critical task arrives and if it has not begun execution. This differs from native threads on the CPU where one task cannot be interrupted and therefore can take longer than necessary and make the computer appear less responsive. A hybrid scheduling algorithm between native and light threads with cooperation between the threads would achieve seamless parallelism. It is important to note that scheduling is not a new concept but it was previously the responsibility of individual driver developers. WDDM attempts to unify the experience across different vendors by controlling the execution of GPU tasks.
Drivers under Windows XP were free to deal with hardware faults as they saw fit either by reporting it to the user or by attempting to recover silently. In some cases when the display driver can be safely stopped, Windows XP may instead alert about the display driver crash, while also disabling the video driver, thus switching down the screen resolution to 640x480 with only 16 colors. With a WDDM driver, the screen resolution will most likely be unaffected; all hardware faults cause the driver to be reset and the user will be notified by a popup; this unifies the behavior across vendors.
Previous drivers were fully implemented in kernel mode, whereas WDDM is implemented partly in user mode. If the user mode area fails with an unrecoverable error, it will, at the most, cause the application to quit unexpectedly instead of producing a blue screen error as it would in previous driver models.
One of the limitations of WDDM driver model version 1.0 is that it does not support multiple drivers in a multi-adapter, multi-monitor setup. If a multi-monitor system has more than one graphics adapter powering the monitors, both the adaptors must use the same WDDM driver. If more than one driver is used, Windows will disable one of them.[12] WDDM 1.1 does not have this limitation.[13]
WDDM 1.0/1.1 does not allow some modes that were previously handled by the driver such as spanning mode (stretching the desktop across two monitors)[14][15] although Dual View is still available.[12][16]
Though this is true for Microsoft's implementation of a composited desktop under Windows Vista, on the other hand, a composited desktop need not theoretically require a new display driver model to work as expected. Successful implementations of composited desktops were done before Windows Vista on other platforms such as Quartz, Compiz, WindowFX. The approach Microsoft attempted was to try to make sure WDDM was a unified experience across different GPUs from multiple vendors by standardizing their features and performance. The software features missing from other driver models could be made immaterial by extensions or if a less restrictive or simply different driver model was in place.
Windows Vista introduced WDDM 1.0 as a new display driver architecture designed to be better performing, more reliable, and support new technologies including HDCP. Hybrid Sleep, which combines hibernation and sleep mode functionality for enhanced stability in the event of power failure, also requires WDDM.[2][why?]
WDDM 1.2 supports display-only and render-only WDDM drivers, such as Microsoft Basic Display Driver[31] and WARP-based Microsoft Basic Render Driver which replaced kernel-mode VGA driver.
Windows 10 includes WDDM 2.0, which is designed to dramatically reduce workload on the kernel-mode driver for GPUs that support virtual memory addressing,[37] to allow multithreading parallelism in the user-mode driver and result in lower CPU utilization.[38][39][40][41] Windows 10 also includes DXGI 1.4.[42]
The Windows Display Driver Model (WDDM) is the graphics display driver architecture introduced in Windows Vista (WDDM 1.0). This design guide discusses WDDM requirements, specifications, and behavior for WDDM drivers.
This ruined my morning, as several Windows 10 PCs were updated to 20H2 and immediately after, Remote Desktop stopped accepting connections. I was able to connect once after every reboot, but after that the host refused every connection. This is not a network or firewall issue, it's a damn graphics driver.
I thought I knew what DX and Graphics card device driver meant. Today I was reading about Windows Display Driver Model(WDDM) and couldn't figure out what it does? It says WDDM is a Display driver model/architecture.
Does it mean it is a model/architecture that should be followed/implemented by the Graphics card manufacturer when writing a driver for their device so that the Windows OS display manager can use the device efficiently?
DirectX. on the other hand is the API(developed by Microsoft) that should be implemented/supported by the graphics cards and its drivers so that other software(not including the OS and its GUI components like display manager) like games can communicate with the Graphics Card using the API?
I see lots of pages that around the April 2017 period talked about NVidia releasing drivers with WDDM 2.2 support. I also see a Microsoft page (here) that specifically mentioned the GTX 1050 GPU as one of the GPUs that meets requirements for something that makes use of WDDM 2.2. I put a GTX 1050 card in a Windows 10 Creator's Update machine (Build 16257.1) and tried NVidia's GeForce drivers from version 381.65 (the April version in which 2.2 support is said to exists) and later. I end up with WDDM 2.1 support consistently across many driver versions (which is below requirements for what I need). This includes the beta/experimental drivers.
Given an NVidia GPU is there any good way to identify whether or not it has WDDM 2.2 support before I buy it? NVidia mentions support in their drivers but there is no mention on how to identify whether or not it is supported on a specific card. Secondary to that question is there something special I need to do to get a WDDM 2.2 driver on the GTX 1050? Or is the above mentioned Microsoft page in error in calling out the card as one that has WDDM 2.2 support?
So get the latest driver from nVIDIA, install this driver for the GTX 1050 and look which WDMM version it supports, when I tested a RS3 build on my laptop I got WDDM2.2 driver fro my older AMD Radeon HD77xxM so your newer card from nVIDIA should also have 2.2
After months of digging, through driver settings, trying different versions etc., I have found the main culprit of my laptop's wake issues. When adaptive-sync is enabled, the screen glitches and does not respond when you try to wake from sleep/hibernation. I have found a workaround, simply by writing some scripts to change to monitor refresh rate to a value such that adaptive-sync is disabled at that refresh rate. It is 60 Hz for my monitor, and 165 Hz is where adaptive-sync is enabled. The PC goes to sleep and wakes up perfectly. Then I wrote a script to change back to 165 Hz, but the screen started to glitch again. This time, the screen responds to my inputs and shows the image, but there are horizontal glitches which make it unusable unless I restart the Intel Graphics Driver (ctrl+shift+win+b combination does not fix the glitches, only disabling and re-enabling the intel gpu fix the screen). These horizontal glitches only occur AFTER the PC wakes from sleep (with 60 Hz) AND I change to 165 Hz.
Intel Graphics Drivers with WDDM 2.7 does not have this problem, though they have terrible adaptive-sync performance and many micro-stutters occur when using a WDDM 2.7 driver (which my laptop was shipped with).
I have reached out to my OEM provider and they said there's neither an Intel Graphics Driver, nor a BIOS driver that is newer than mine. So they can not fix this. They offered me to bring my laptop to their service, but I suspect they're going to do anything besides reverting my Intel graphics driver to WDDM 2.7.
Is it possible to fix this? I don't want to restart my graphics driver every time the PC wakes from sleep, as it crashes any programs that were using the Intel GPU. Please help me, I am really desperate at this point. If there are no complete fixes, I would be more than happy for a workaround that is less destructive than restarting the GPU drivers.
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