|
I _was_ running into the OpenGL bug, I just actually discovered this independently while trying to fix an apparently unrelated problem in Dropbox, which was nice enough to actually have an error message instead of just blackness. (That error started much much more recently, so I didn't think they were related...but apparently Dropbox had just updated or something.)
I would like to report: This bug is not just on 'Windows 7', and 'old computers'. This laptop is Windows 10, it came with it, and it's something like four years old. The problem is that DisplayLink adapters do not support OpenGL2. In any way...I mean, I assumed it would be slow, it's software only, but even if I'd thought Calibre was rendering books using it...who cares how fast a book renders?
I was not able to fix it, so I just stopped using that video adapter for the time being, and now everything works. Actually, things seems to work if I start without that connected, and then connect it, even if I move the window over there. I'm not entirely sure what's going on there.
And while I'm not quite sure why Calibre needs OpenGL, of any sort, although I guess that's part of Qt...but I think the real bug here was utter lack of _telling me_ something was wrong. Dropbox at least did that, mentioning OpenGL, which gave me a starting point. If I hadn't had Dropbox installed, I wouldn't have figured this out.
|