Gpu rendering was introduced in version 20.08.2 as an experimental feature. It worked very well in my Dell e6430 laptop with Intel HD 4000. But it doesn't work in any other version than v20.08.2. Please roll back the changes you did for intel HD graphics to this version.
Does the problem still appears with the latest AppImage?
๐๐งน โ ๏ธ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME. For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging. Thank you for helping us make KDE software even better for everyone!
๐๐งน This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.