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

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Message-ID: <050632f0-6440-1254-2aed-931dd515ff37@suse.de>
Date:   Fri, 9 Oct 2020 15:31:05 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     stsp <stsp2@...dex.ru>, linux-fbdev@...r.kernel.org,
        Linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: drmfb console switching problems/questions

Hi

Am 09.10.20 um 15:19 schrieb stsp:
> 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?

I can't say for sure. IIRC SDL2 can use DRM directly. If your
application is stuck at SDL1, fbdev or X11 are the only realistic
options. But the SDL dev could probably give you a better answer.

Best regards
Thomas


-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer



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