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MacDougal · 10-19-2024, 07:40 PM

Since updating graphic drivers to AMD Adrenalin 24.9.1 (WHQL), the Calibre book viewer simply shows a black window. No UI elements are drawn. The book is still there (it can be copy/pasted, things can be dragged, and even the button strip can be pulled out where it becomes visible). This happens with all versions of Calibre back to version 7.12, and affects the book editor, pointing to an issue with the QT Webengine and graphics driver.

I've tried adding the "QTWEBENGINE_CHROMIUM_FLAGS=--disable-gpu" environment variable, but it simply does nothing to calibre's GPU usage, so presumably is not disabling GPU acceleration on the QT Webengine and the black window persists.

The only thing that seems to fix the issue is going back to an older video driver 24.7.1, or booting into safe mode (which would also disable the driver's acceleration.

Does anyone have any fixes to disable GPU acceleration in calibre's QT Webengine, or any way to get things working again with the current drivers? Any settings in Calibre that I can use?

10-19-2024, 07:40 PM	#1
MacDougal Junior Member Posts: 5 Karma: 10 Join Date: Oct 2024 Device: Kobo Glo	Viewer just opens a black screen. Since updating graphic drivers to AMD Adrenalin 24.9.1 (WHQL), the Calibre book viewer simply shows a black window. No UI elements are drawn. The book is still there (it can be copy/pasted, things can be dragged, and even the button strip can be pulled out where it becomes visible). This happens with all versions of Calibre back to version 7.12, and affects the book editor, pointing to an issue with the QT Webengine and graphics driver. I've tried adding the "QTWEBENGINE_CHROMIUM_FLAGS=--disable-gpu" environment variable, but it simply does nothing to calibre's GPU usage, so presumably is not disabling GPU acceleration on the QT Webengine and the black window persists. The only thing that seems to fix the issue is going back to an older video driver 24.7.1, or booting into safe mode (which would also disable the driver's acceleration. Does anyone have any fixes to disable GPU acceleration in calibre's QT Webengine, or any way to get things working again with the current drivers? Any settings in Calibre that I can use?