linux-kernel - Re: drmfb console switching problems/questions

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Date:   Fri, 9 Oct 2020 16:19:23 +0300
From:   stsp <stsp2@...dex.ru>
To:     Thomas Zimmermann <tzimmermann@...e.de>,
        linux-fbdev@...r.kernel.org,
        Linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: drmfb console switching problems/questions

09.10.2020 15:58, Thomas Zimmermann пишет:
> Hi
>
> Am 09.10.20 um 14:16 schrieb stsp:
>> 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?
> I don't think so. Both, SDL1 and fbdev, are pretty much dead these days.
> The solution to fbdev is DRM, which does not have these problems.
>
> You could your application under X11 to use SDL's X backend. X would do
> all the VC handling then.
That of course works.
I was trying w/o X.
Do you think it is possible for
me to test other techniques of
drawing under kms console?
Or fbcon and X are all that we
have?