09.10.2020 14:59, Thomas Zimmermann пишет:
Fbdev exposes the video ram (or a shadow buffer of it) to all applications. Only one can draw at the same time. It's a limitation of the design. To fix this, your application has to stop drawing when you switch consoles.
OK, thanks for info. Quite a sad news, if you ask me. Is there any ongoing work at solving that?
Anyway, the fact that fb can permanently hang, is, I suppose, another problem - the one that can't be worked around in an app. I suspect it is the result of sdl doing ioctl(console_fd, KDSETMODE, KD_GRAPHICS); After which, I think, redrawing on a VC switch became disabled. Would it make sense to improve SAK to unfreeze from that? Otherwise its too easy to hang the screen permanently, and no way to recover.
