Quote:
Originally Posted by kovidgoyal
That's correct and it works in all Qt modes, not just debug. As for its effects only the Qt developers can tell you in detail what it does. If it isn't resolving the issue for you then stick with the downgraded video drivers. You might also get some useful debug output from qt by running the viewer in a command prompt as
calibre-debug -w
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Here's the output (with the environment variable set) if that any use to you. It still creates a black window as above:
Quote:
C:\Program Files\Calibre2>calibre-debug -w
QPA platform: windows
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 81.55183946488295 x 81.64285714285714
ApplicationPaletteChange event ignored
Using calibre Qt style: True
Sandboxing disabled by user.
[2.140] bridge ready
[2.281] iframe ready
[0.000] Load of book started
[0.000] prepared emitted
[0.062] webview loading requested
[0.187] loading finished
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I have also reported this to AMD as a bug so they can investigate the issue at their end.