[Bug 278930] x11/xorg no support of DisplayPort 1.2 specification, resulting a blank screen till reboot

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278930

Marcin Cieślak <saper@saper.info> changed:

           What    |Removed                     |Added
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                 CC|                            |saper@saper.info

--- Comment #1 from Marcin Cieślak <saper@saper.info> ---
I understand from your emails that the X environment starts (login display
manager), window manager afterwards - but after about 5 seconds the screen goes
blank
.
Can you dump /var/log/X0.log files? Also the output of "dmesg" output and
/var/log/messages? (You might need to script something to get the logs out of
the machine for example using at(1) to copy dmesg/the logs while you cannot see
the screen).

Can you disable the login manager, just log in to the text console and see if
"startx" provides a working environment? Please start something very simple
like "twm" (available as x11-wm/twm from ports). 

The following $HOME/.xinitrc should start twm:

exec /usr/local/bin/twm

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