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Old 06-24-2015, 04:30 AM   #1
Registered: Jan 2009
Location: Huenfeld, Germany
Distribution: Debian Jessie
Posts: 98

Rep: Reputation: 4
Question Bizarre monitor behaviour after debian jessie upgrade

Hi All,

I have a dual monitor setup. The external one is a VGA HD (Fujitsu with 1920x1200 resolution) run through an adapter which converts HDMI to VGA. The other is the laptop monitor (AU Optronics 14" with 1920x1200 resolution). The laptop only has an HDMI port, hence the adapter. I have the same image on both monitors... for reasons I won't go into here.

All this worked fine with wheezy and after the initial upgrade to jessie it still seemed OK. I have now done an upgrade, which has caused some really odd behaviour. The login screen is only displayed on the laptop monitor, not on the Fujitsu, when I boot up. I could live with that, but the laptop monitor is automatically switched off after the initial boot selection screen. That's really weird!

I can log in because I know I'm the first user on the list, so I just hit enter and type my password without actually seeing anything. Moving the mouse around shows me that the dual monitor mode is on, since the mouse "disappears" onto the laptop screen. After logging in, I get the desired single view on both screens.

I've searched a number of forums, but I cannot find anything useful. Most posts have to o with settings that are only relevant once the user is logged in. My problem has to do with the settings which are in operation before logging in.

Can anyone give me a hint as to where these settings are defined? Or maybe a website which explains how the monitors are dealt with prior to log in?

Thanks in advance.
Old 06-25-2015, 07:54 PM   #2
Senior Member
Registered: Dec 2009
Posts: 1,387

Rep: Reputation: 173Reputation: 173
seems like you need to configue "greeter"
there are several and you can mess around if you want to or just wait for a fix.
Old 06-30-2015, 03:01 AM   #3
Registered: Jan 2009
Location: Huenfeld, Germany
Distribution: Debian Jessie
Posts: 98

Original Poster
Rep: Reputation: 4
Lengthy silence...

Originally Posted by yooy View Post
seems like you need to configue "greeter"
there are several and you can mess around if you want to or just wait for a fix.
Where can I find information about "greeter" and which flavour I have on my machine? Would a command like "find . -iname 'greeter*'" help?

I have several other things, like a non functioning IPCop, to look into at the moment (hence the lengthy silence), but I'll try finding greeter today.

If anyone else has any ideas... I'm all ears (or eyes as the case may be). I'd also like to know if anyone else has had similar difficulties after switching to jessie.

03.07.2015: I tried The aforementioned find command and indeed found a lot of stuff in /etc/gdm3. Ufortunately it's all pretty obscure so I guess I'll have to hunt around for more information.

Last edited by achim_59; 07-03-2015 at 11:57 AM. Reason: additional info
Old 07-29-2015, 12:17 PM   #4
LQ Newbie
Registered: Jul 2015
Location: Las Vegas, Nevada US
Distribution: debian jessie
Posts: 4

Rep: Reputation: Disabled
external moniter problem debian jessie

Hey ya I am having the same problem, it is kind of weird lol im also using an hdmi only.

Last edited by fractured; 07-29-2015 at 01:16 PM.
Old 01-15-2016, 03:22 PM   #5
LQ Newbie
Registered: Aug 2008
Posts: 1

Rep: Reputation: 0
Have the same issue with an acer travelmate 5742


jessie, monitor

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