Quote:
Originally Posted by DNSB
If you followed the multiple discussions in this and other forums, the issues are mainly with QT which is used for managing graphics on programs used on multiple platforms. Sometimes, the QT programmers will fix bugs in a later point release, other times, they release a new major version which causes issues for more older video cards.
And sadly, this is not a first. Two ePub renderers I use have been broken by new versions with updated QT versions. Some can be fixed by environmental variables settings to disable using the GPU for instance while others have required major effort to program around QT's "improvements".
For one example, my older laptop has dual Intel and NVidia video. So far the Intel video has not broken but the NVidia video has twice required a driver update. Adding a couple of Windows environmental variables has seemed to kept that from happening in the last few updates. I'm not actually certain if the first three items still work to force using opengl and the fourth to disable hardware acceleration.
"QT3D_RENDERER", "opengl"
"QSG_RHI_BACKEND", "opengl"
"QT_OPENGL", "software"
"QTWEBENGINE_CHROMIUM_FLAGS", "--disable-gpu"
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I believe QT was updated for 7.17 to fix a problem someone was having with calibre on a Mac. Now it's causing more problems it seems.