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Date: Thu, 17 Sep 2015 20:48:06 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Glenn English <ghe@slsware.net>
cc: freebsdQuestions <questions@freebsd.org>
Subject: Re: 10.2 graphics problem
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On Thu, 17 Sep 2015, Glenn English wrote:

> On Sep 17, 2015, at 5:23 PM, Warren Block <wblock@wonkity.com> wrote:
>
>> Again, that is solved by using vt(4).  Although I should ask which video hardware you have.  Sorry if that has been mentioned already.
>
>> root@log:~/init.d# lspci | egrep -i radeon
>> 03:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Robson CE [AMD Radeon HD 6300 Series]
>> 03:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Cedar HDMI Audio [Radeon HD 5400/6300 Series]
>
> Is that an the answer?

Yes, although around these parts we tend to use pciconf -lv.  You have 
an AMD Radeon HD6300.

> And what is vt(4)?

vt(4) is the KMS-aware system console.  To use it, enter

   kern.vty=vt

in /boot/loader.conf.  It will take effect on boot.

The problem of leaving X and having the screen stop responding is due to 
the old system console not understanding kernel video mode switching. 
vt(4) is the new console.  See 'man 4 vt' for more information.