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Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 5.12.2, 5.14.0 Alpha
Affects Version/s: 5.12.0
Component/s: Widgets: Widgets and Dialogs
Labels:
None
Environment:

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Dynamic GL LibGL Vendor: ATI Technologies Inc.
Renderer: AMD Radeon (TM) R7 M370
Version: 4.5.14523 Compatibility Profile Context 24.20.12019.1010
Shading language: 4.50
Format: Version: 4.5 Profile: 2 Swap behavior: 2 Buffer size (RGBA): 8,8,8,8 Stencil buffer: 8
Profile: None (QOpenGLFunctions_4_5), Core (QOpenGLFunctions_4_5_Core), Compatibility (QOpenGLFunctions_4_5_Compatibility)
         Card name : AMD Radeon (TM) R7 M370
       Driver Name : aticfx64.dll
    Driver Version : 24.20.12019.1010
         Vendor ID : 0x1002
         Device ID : 0x6600
         SubSys ID : 0x06DF1028
       Revision ID : 0x0081

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Dynamic GL LibGL Vendor: ATI Technologies Inc. Renderer: AMD Radeon (TM) R7 M370 Version: 4.5.14523 Compatibility Profile Context 24.20.12019.1010 Shading language: 4.50 Format: Version: 4.5 Profile: 2 Swap behavior: 2 Buffer size (RGBA): 8,8,8,8 Stencil buffer: 8 Profile: None (QOpenGLFunctions_4_5), Core (QOpenGLFunctions_4_5_Core), Compatibility (QOpenGLFunctions_4_5_Compatibility)          Card name : AMD Radeon (TM) R7 M370        Driver Name : aticfx64.dll     Driver Version : 24.20.12019.1010          Vendor ID : 0x1002          Device ID : 0x6600          SubSys ID : 0x06DF1028        Revision ID : 0x0081

the bug fix ~~QTBUG-50371~~ takes many seconds every time you hover over a toolbar item, or open a combo box.

The main problem is the function "forcedScreenForGLWindow" which loads dx9.dll (including many, many sub-dlls) and unloads them instantly.

The main problem seems to be the continued calling of "IDirect3D9 *direct3D9 = direct3DCreate9(D3D_SDK_VERSION);"

Considerable solutions:

Cache the return value of GpuDescription::detect().gpuSuitableScreen in a static variable.
Offer a environment variable to disable that check
Offer a QSurfaceFormat option before creating the first QApplication object, that skips it.

resulted from

QTBUG-50371 Windows: OpenGL crash on start on Intel + AMD GPU (Multi-adapter) systems

For Gerrit Dashboard: QTBUG-73008
#	Subject	Branch	Project	Status	CR	V
250680,4	Windows QPA: Cache "forcedScreenForGLWindow" to avoid overhead	5.12	qt/qtbase	Status: MERGED	+2	0

There are no open Gerrit changes

Hide There is 1 closed Gerrit change

Windows QPA: Cache "forcedScreenForGLWindow" to avoid overhead: Gerrit Review: