WDDM Transition

WDDM Transition

LINK ::: https://shurll.com/2t85g5

Starting in Windows 8, several features help to minimize or eliminate screen flashes and flickers during the boot process, during transitions from lower power states, and during transitions back to operating system control in driver upgrades or system bug checks. In addition, system firmware on Windows 8 and later computers must detect native resolution and timing of the integrated display panel at the time of power up and hand off this information to the operating system. Windows Display Driver Model (WDDM) 1.2 and later display miniport drivers must support this behavior.

The driver can call the DxgkCbAcquirePostDisplayOwnership function (available starting in Windows 8) to query the operating system for the exact state of the current frame buffer and the display mode that was set by the firmware and boot loader. With the information in the DXGK_DISPLAY_INFORMATION structure retrieved by this function, it's possible for the driver to keep the display controller active and not cause a re-synchronization of the monitor. Because the driver also has detailed information about the frame buffer, it's possible to perform a smoother transition.

The operating system can request a PnP stop of the display device by calling the DxgkDdiStopDevice function. At this time typically the screen is blanked out (renders as black) while the operating system takes over the display control. The operating system can call the DxgkDdiStopDeviceAndReleasePostDisplayOwnership function (available starting in Windows 8) that requires the WDDM driver to set up a frame buffer configured for scan out. The operating system can render into this frame buffer while it's in control of the display, making it possible to perform a smooth transition.

Sometimes the operating system experiences an unrecoverable error and has to issue a system bug check. When this happens, there are certain cases where the operating system has to take control of the display but doesn't have the ability to stop the WDDM driver. WDDM 1.2 and later drivers are required to implement the DxgkDdiSystemDisplayEnable and DxgkDdiSystemDisplayWrite functions, which let the operating system seamlessly transition to a state where it can display the error screen while maintaining the graphical interface at a high resolution and color depth. This transition eliminates a jarring user experience.

WDDM 2.1 introduces the transition of the GPU shader compiler stack from DirectX Byte Code (DXBC) to DirectX Intermediate Language (DXIL), a newer format for transmitting shader instructions to the GPU. Transition to DXIL delivers the following benefits to developers:

You may have noticed a mysterious new optional feature called Hardware Accelerated GPU Scheduling appear in the advanced graphics settings page with the Windows 10 May 2020 update. The purpose of this blog is to give some background on this new feature and how we are introducing it. It is intended for folks curious about Windows internals. Remaining on the cutting edge of hardware innovation has always been a critical aspect of our graphics platform. Hardware Accelerated GPU Scheduling enables more efficient GPU scheduling between applications. For most users, this transition will be transparent. It is one of those things that if we do our job right, you will never know the transition happened. As the graphics platform continues to evolve, this modernization will enable new scenarios in the future.

With the transition to a broad set of applications using the GPU for richer graphics and animations, the platform needed to better prioritize GPU work to ensure a responsive user experience. Thus, the WDDM GPU scheduler was born.

The new GPU scheduler is a significant and fundamental change to the driver model. Changing the scheduler is akin to rebuilding the foundation of a house while still living in it. To ensure a smooth transition we are introducing the new scheduler as an early-adopter, opt-in feature. During the transition we will gather large scale performance and reliability data as well as customer feedback.

The transition should be transparent, and users should not notice any significant changes. Although the new scheduler reduces the overhead of GPU scheduling, most applications have been designed to hide scheduling costs through buffering.

While browsing through some of the changes to the Windows 8 Developer Preview, I happened upon the list of improvements in DXGI 1.2. I have to say, the list looks pretty good. After fixing the most glaring problems with the transition to WDDM and DWM -- memory usage and unaccelerated GDI rendering -- Microsoft has started evolving DXGI further, and there's some good stuff here.

Since the Windows XP/Server 2000 days the XDDM/XPDM (Windows XP Driver Model) display driver model was used right up until Windows Vista/Windows 7/Server 2008R2 which saw a new model called WDDM (Windows Display Driver Model) introduced. Even though WDDM was the new model, Windows Vista/Windows 7/Server 2008R2 OS could still make use of XDDM/XPDM. I guess Microsoft wanted to correctly transition towards the new model.

Being that the video hardware is virtualized, user-mode components (the OpenGL ICD is one of those) no longer have direct access to that hardware, and need a kernel transition in order to program registers, submit command buffers, or know the real addresses of the video resources in memory.

On touch-enabled devices and tablets like the Surface Pro, you'll find big changes in the way that the pen and touch elements work, with more graceful transitions from PC to tablet mode and vice versa. On conventional PCs with multiple monitors and docking stations, the system is finally smart enough to remember the arrangement of windows when you reconnect. There's also a new Voice Typing feature that lets you dictate text to be automatically typed into any app or text box. (Press Windows key + H to activate this feature.)

What is Desktop Window Manager used for? It is a manager that is responsible for enabling visual effects on your desktop. It manages glass window frames, high-resolution support, 3D window transitions animations, etc. These can give pretty effects in Windows.

Some Medicaid agencies in states with state-based marketplaces are partnering to identify strategies to ease the transition to commercial coverage for individuals deemed ineligible for Medicaid. Through consistent communication and collaboration, state Medicaid agencies and health insurance marketplaces are working to mitigate barriers and facilitate shifts into marketplace coverage, including collaborating on shared language used in notices and outreach materials, clear communication on timing of changes, and efforts to share, where possible, appropriate data about enrollees. States are also exploring opportunities and potential benefits of easing transitions between programs, especially where the same carriers participate in both Medicaid and the Marketplace.

Since there is no direct upgrade path from Windows XP to Windows 10, it means that you can't retain your personal data and programs during the transition. It will completely wipe everything. As such, you need to back up your data and then manually restore it on Windows 10.

For those who ultimately are not able to upgrade their existing PC to Windows 11 due to device ineligibility and are not ready to transition to a new device, Windows 10 remains the right choice. Windows 10 will still be supported through October 14, 2025, and we recently announced that the next feature update to Windows 10 is coming later this year.

The risk of suicide after leaving inpatient behavioral health care is 200-300 times higher than for the general population and is highest within the first few days after discharge (Chung et al. 2019). This period of high risk lasts for up to three months after discharge (Olfson et al. 2016; Walter et al., 2019), and in the U.S. nearly 15% of people who died by suicide had contact with inpatient metnal health services in the year before death (Ahmedani et al., 2014). It is clear that the transition between inpatient and outpatient behavioral health care presents tremendous opportunity for closing a deadly gap in behavioral health care.

Closing this gap requires inpatient and outpatient behavioral organizations to work together an align strategies to ensure the safety of individuals who are likely at extremely high risk of suicide. The National Action Alliance for Suicide Prevention developed Best Practices in Care Transitions for Individuals with Suicide Risk: Inpatient Care to Outpatient Care to guide both inpatient and outpatient systems in the pursuit and implementation of evidence-based and innovative strategies to improve care transitions. One of these strategies, family involvement, contributes to increasing connectedness with family and significant others which, after a suicide crisis, strengthens interventions and supports long-term recovery (Haselden et al., 2019; Olfson et al., 2000). Companion resources are now available to guide systems toward implementing care transitions best practices, including the Inpatient and Outpatient Health Care Self-Assessments, Inpatient and Outpatient Health Care Action Planning templates, and a family involvement educational handout.

This webinar will focus on the implementation of best practices for inpatient psychiatric to outpatient behavioral health care transitions. Two exemplar organizations will highlight their care transitions initiatives, discuss the application of best practice recommendations, and share how implementation support tools were leveraged to improve care transitions practices.

The most effective solution is to update to ESX 4.0 Update 1, which provides a new WDDM driver that is installed with VMware Tools and is fully supported. After VMware Tools upgrade you can find it in C:\Program Files\Common Files\VMware\Drivers\wddm_video.

Update 12/10/10: As a follow up to these tests, I wanted to see what happens when the wddm driver is installed under ESX(i) 4.0 Update 1 and its corresponding VMware Tools, and then the VM is moved to an ESX(i) 4.1 cluster and the VMware Tools are upgraded. Does the wddm driver remain in tact, or will the 4.1 tools upgrade somehow change the driver? During this test, I opted to use Windows 7 Ultimate 32-bit as the guest VM guinea pig. A few discoveries were made, one of which was a surprise: 2b1af7f3a8