Can't boot with external displays connected

asked 2015-12-01 05:07:56 -0500

octohedron gravatar image

updated 2015-12-01 23:33:11 -0500

Hello, i just finished updating my fedora 23 installation and for some reason i can't boot into the desktop if i have my external displays connected.

Also tried adding nomodeset to the kernel and that didn't work either.

external displays:

LG 24" LCD (shows up as goldstar 21" in the display settings...)

Acer 19" LCD

I can boot with just one of the external displays without any issues.

this never happened in ubuntu, i could plug or unplug anything during booting or after or w/e and everything worked fine!

journalctl shows up some interesting info, here is journalctl -xb -r and journalctl --system -r

computer is Lenovo y580 laptop

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Are one of these displays using a USB display adapter, or does your laptop have multiple display outputs? Have you tried the devices individually to isolate a single component as the problem?

randomuser gravatar imagerandomuser ( 2015-12-01 08:13:03 -0500 )edit

hello, good question i will try to isolate the device with further testing, btw it's one HDMI (24" LG) and one VGA(19"). also, please read the journalctl logs, there might be useful info there.

octohedron gravatar imageoctohedron ( 2015-12-01 11:30:16 -0500 )edit

well, i checked everything and the problem is when booting with the two external monitors connected, the screen is completely black and i can't do anything, tried ctrl-alt-f2 and typing my password without seeing the login screen just in case it's not displaying in the right display but nothing... anything i can try?

octohedron gravatar imageoctohedron ( 2015-12-01 23:31:15 -0500 )edit

journalctl -b gives you the current boot's logs. You're not seeing logs from the problem boot when you run it. Instead, do journalctl -b -1 after reproducing the problem boot to view the previous boot's logs.

randomuser gravatar imagerandomuser ( 2015-12-02 00:10:39 -0500 )edit

digging around a little bit i found out it's because nvidia optimus or w/e it's called isn't supported for some reason

octohedron gravatar imageoctohedron ( 2015-12-02 04:50:16 -0500 )edit