xserver - black screen

[Greg V]

On Thu, Dec 27, 2018 at 2:54 PM, starikarp at yandex.com wrote:
> On Sat, 22 Dec 2018 11:22:46 -0800
> Pete Wright <pete at nomadlogic.org> wrote:
> 
>> 
>> 
>>  hopefully there will more useful info in the dmesg buffer when you
>>  load the radeonkms driver vi rc.conf.  one final thing you can also
>>  try is uninstalling the drm-kmod package and installing the
>>  "drm-legacy-kmod" package if you haven't tested that already.
>> 
>>  cheers,
>>  -pete
>> 
> 
> Today I start again kldload radeonkms.ko.
> I have installed drm-kmod legacy and ATI drivers legacy too and put
> in /etc/rc.conf kld_list="/boot/modules/radeonkms.ko"
> and shutdown computer and start again.
> I attached file message.txt which start with the new settings.
> Result was black screen but I did log as root and shutdown. About 10
> minutes later I did star again without kld_list in rc.conf and you can
> see in the message.txt also.

Looks like you're booting with UEFI, try disabling the EFI framebuffer 
with hw.syscons.disable=1 ?

https://github.com/FreeBSDDesktop/DEPRECATED-freebsd-base-graphics/issues/170

(try with the non-legacy radeonkms too)