Problem with 2 external monitors on a laptop

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Problem with 2 external monitors on a laptop

Xxxxxxx Yyyyyyy

Hi.
I use HP ProBook 6560b (LVDS1) with 2 external Fujitsus B24T (VGA1, HDMI2), both connected via docking station.

OS: debian testing with xfce

 

LVDS1 - off

VGA1 - on

HDMI2 - on

 

Recent (approx 1 month back) apt-get upgrade (also using latest debian-testing.iso) made it impossibe to use this configuration.

I'm asked for a LUKS password, i can see initial on-screen logs but when Os tries to start X, both monitors goes black (i cannot switch to TTY).

 

However when one of monitors is unplugged, OS & X starts with no errors, then i plug the other monitor in and they both works.

 

Mariusz

 


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Re: Problem with 2 external monitors on a laptop

Floris-2
Op Thu, 06 Oct 2016 15:17:56 +0200 schreef Xxxxxxx Yyyyyyy <[hidden email]>:

Hi.
I use HP ProBook 6560b (LVDS1) with 2 external Fujitsus B24T (VGA1, HDMI2), both connected via docking station.

OS: debian testing with xfce

 

LVDS1 - off

VGA1 - on

HDMI2 - on

 

Recent (approx 1 month back) apt-get upgrade (also using latest debian-testing.iso) made it impossibe to use this configuration.

I'm asked for a LUKS password, i can see initial on-screen logs but when Os tries to start X, both monitors goes black (i cannot switch to TTY).

 

However when one of monitors is unplugged, OS & X starts with no errors, then i plug the other monitor in and they both works.

 

Mariusz

 


create the folder
/var/log/journal

reboot with both monitors plugged in and let the configuration fail
unplug a monitor, reboot and use
journalctl -b -1
to read the error messages


Floris

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Re: Problem with 2 external monitors on a laptop

Nicholas Geovanis-2
I have likely the same problem with a single external monitor in Jessie. In fact the OS or X is turning down the brightness on the monitors. If you haven't already, simply try increasing brightness.

On Fri, Oct 7, 2016 at 5:28 AM, Floris <[hidden email]> wrote:
Op Thu, 06 Oct 2016 15:17:56 +0200 schreef Xxxxxxx Yyyyyyy <[hidden email]>:


Hi.
I use HP ProBook 6560b (LVDS1) with 2 external Fujitsus B24T (VGA1, HDMI2), both connected via docking station.

OS: debian testing with xfce

 

LVDS1 - off

VGA1 - on

HDMI2 - on

 

Recent (approx 1 month back) apt-get upgrade (also using latest debian-testing.iso) made it impossibe to use this configuration.

I'm asked for a LUKS password, i can see initial on-screen logs but when Os tries to start X, both monitors goes black (i cannot switch to TTY).

 

However when one of monitors is unplugged, OS & X starts with no errors, then i plug the other monitor in and they both works.

 

Mariusz

 


create the folder
/var/log/journal

reboot with both monitors plugged in and let the configuration fail
unplug a monitor, reboot and use
journalctl -b -1
to read the error messages


Floris