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#1 2014-03-08 19:32:59

ifsixwasnine
Member
Registered: 2013-10-25
Posts: 10

[S]iMac with additional monitor: built-in monitor turns off at startup

Hi,
I'm using an iMac Intel (2007) with an external monitor. I used to have the external one on the left and the iMac on the right.
Everything was fine until today, when I *just* moved external monitor on the right and changed my xrandr script like this:

xrandr --output LVDS --mode 1680x1050 --pos 0x0 --rotate normal --output DIN --off --output DVI-0 --mode 1920x1080 --pos 1680x0 --rotate normal

The thing is that now when I turn on the computer the built in monitor turns off as the startup process reaches the Xorg phase.
Do you have any ideas about why this happens?

I didn't touch the Xorg configuration at all, when I installed the system both monitors were recognized correctly.

Thanks in advance!

Last edited by ifsixwasnine (2014-04-03 13:01:06)

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#2 2014-03-10 01:01:13

karkhaz
Member
Registered: 2014-01-25
Posts: 75

Re: [S]iMac with additional monitor: built-in monitor turns off at startup

Could you post the original xrandr command that was working for you before, if you have it?

If your mac is still usable with just the external monitor, could you post the output of xrandr (with no arguments)?

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#3 2014-03-10 15:50:16

ifsixwasnine
Member
Registered: 2013-10-25
Posts: 10

Re: [S]iMac with additional monitor: built-in monitor turns off at startup

Hi karkhaz,
Yes, computer is usable with just the external monitor, as a temporary workaround I'm running a `xset dpms force off` to turn off and on again both monitors.
xrandr output:


Screen 0: minimum 320 x 200, current 3600 x 1080, maximum 8192 x 8192
DVI-0 connected 1920x1080+1680+0 (normal left inverted right x axis y axis) 521mm x 293mm
   1920x1080      60.0*+
   1680x1050      60.0  
   1280x1024      75.0     60.0  
   1440x900       75.0     59.9  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   640x480        75.0     72.8     66.7     60.0  
   720x400        70.1  
LVDS connected 1680x1050+0+0 (normal left inverted right x axis y axis) 433mm x 270mm
   1680x1050      60.0*+
   1400x1050      60.0  
   1280x1024      59.9  
   1440x900       59.9  
   1280x960       59.9  
   1280x854       59.9  
   1280x800       59.8  
   1280x720       59.9  
   1152x768       59.8  
   1024x768       59.9  
   800x600        59.9  
   848x480        59.7  
   720x480        59.7  
   640x480        59.4  
DIN disconnected (normal left inverted right x axis y axis)

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#4 2014-03-13 18:27:28

ifsixwasnine
Member
Registered: 2013-10-25
Posts: 10

Re: [S]iMac with additional monitor: built-in monitor turns off at startup

up?

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#5 2014-04-02 17:39:28

ifsixwasnine
Member
Registered: 2013-10-25
Posts: 10

Re: [S]iMac with additional monitor: built-in monitor turns off at startup

This problem got worse after a system upgrade.
Now the built in monitor doesn't turn on even after `xset dpms force off; xset dpms force on;`.
Any ideas?
Thank you.

Edit: even if the monitor is off, if I take a screenshot of the whole screen (Built-in + External), I do see windows placed within the built in monitor.

Last edited by ifsixwasnine (2014-04-02 17:40:56)

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#6 2014-04-03 13:01:38

ifsixwasnine
Member
Registered: 2013-10-25
Posts: 10

Re: [S]iMac with additional monitor: built-in monitor turns off at startup

Solved:

systemctl mask systemd-backlight@backlight:radeon_bl0.service

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