From: stsp <stsp2@yandex.ru>
To: Thomas Zimmermann <tzimmermann@suse.de>,
linux-fbdev@vger.kernel.org,
Linux kernel <linux-kernel@vger.kernel.org>
Subject: Re: drmfb console switching problems/questions
Date: Fri, 09 Oct 2020 12:16:25 +0000 [thread overview]
Message-ID: <70ce31ca-5922-584c-8631-3853c488f3c7@yandex.ru> (raw)
In-Reply-To: <df4d1918-dcb1-4951-6280-f178ecbbfc2f@suse.de>
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.
next prev parent reply other threads:[~2020-10-09 12:16 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-09 10:50 drmfb console switching problems/questions stsp
2020-10-09 11:59 ` Thomas Zimmermann
2020-10-09 12:16 ` stsp [this message]
2020-10-09 12:58 ` Thomas Zimmermann
2020-10-09 13:19 ` stsp
2020-10-09 13:31 ` Thomas Zimmermann
2020-10-09 14:14 ` stsp
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