svn commit: r271023 - stable/10/sys/dev/vt

[Ronald Klop]

On Wed, 03 Sep 2014 16:57:53 +0200, Alexey Dokuchaev <danfe at freebsd.org>  
wrote:

> On Wed, Sep 03, 2014 at 10:34:21AM -0400, Ed Maste wrote:
>> On 3 September 2014 10:07, Alexey Dokuchaev <danfe at freebsd.org> wrote:
>> > I'm also wondering why on PowerPC vt(4) behaves much better  
>> (switching is
>> > instant, no artifacts at all).
>>
>> The VGA vt(4) issues all stem from the relatively complex and arcane
>> VGA hardware and a somewhat limited vt_vga implementation.
>
> Can you elaborate a bit on the technical side of things?  Particularly,  
> it
> looks strange that syscons(4) was able to work just fine on "relatively
> complex and arcane VGA hardware", while more modern vt(4) is fighting  
> with
> problems.

AFAIK syscons works in the text mode of the BIOS. Not on VGA graphics mode.
See the vt man page for textmode in vt_vga.
http://www.freebsd.org/cgi/man.cgi?query=vt&manpath=FreeBSD+10.0-stable

Regards.
Ronald.

>
> Don't get me wrong, I greatly appreciate all of you guys' work, just want
> to understand better what are the challenges you're facing.  Thank you,
>
> ./danfe
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