external HDMI display doesn't work at login only

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amigo421
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external HDMI display doesn't work at login only

Post by amigo421 » Thu Mar 01, 2018 6:39 am

Mint 18.3 cinnamon
Lenovo G580
External LG 25UM58-P

usually I'm using this with switched off laptop's display, but doesn't matter the case below is the same if both displays are working.

display (this is ultra wide) works correct inside the session,
however it does show me nothing on login dialog (display's firmware doesn't show me "no signal on hdmi"),
the same issue if both monitors (internal/external) are enabled - black screen

after typing my password I'm logged into the session and displays work as expected

any idea?

thank you

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catweazel
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Re: external HDMI display doesn't work at login only

Post by catweazel » Fri Mar 02, 2018 1:22 am

amigo421 wrote:
Thu Mar 01, 2018 6:39 am
any idea?
The default video output port is set by your machine's BIOS. You might want to find out if the BIOS has support for changing the default output device.
A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it. - Max Planck

amigo421
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Re: external HDMI display doesn't work at login only

Post by amigo421 » Fri Mar 02, 2018 2:38 am

catweazel wrote:
Fri Mar 02, 2018 1:22 am
amigo421 wrote:
Thu Mar 01, 2018 6:39 am
any idea?
The default video output port is set by your machine's BIOS. You might want to find out if the BIOS has support for changing the default output device.
I'll check , thank you

however win10 works fine on the same hardware without any specific steps

asinoro
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Re: external HDMI display doesn't work at login only

Post by asinoro » Fri Mar 02, 2018 3:16 am

Can you post this command?

Code: Select all

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