I tested it on Utopic and this behavior didn't occur: both monitors work
after resume.
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https://bugs.launchpad.net/bugs/1454160
Title:
External monitor is
Yes.
vivid + 3.17.1-031701-generic #201410150735 SMP Wed Oct 15 11:36:31 UTC 2014
x86_64 x86_64 x86_64:
The problem does *not* occur.
However, with a recent kernel (3.19.0-16-generic #16-Ubuntu SMP Thu Apr
30 16:09:58 UTC 2015 x86_64 x86_64 x86_64), the problem occurs.
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** Summary changed:
- External monitor is disabled after resume (only on 15.04)
+ External monitor is disabled after resume
** Description changed:
I have an external screen connected to my machine (T450s, via docking
station) and after resuming from suspend, my external monitor is
After some trial and error it seems like I have to rephrase the initial
bug report:
If I resume from suspend caused by systemctl suspend, sudo pm-suspend,
or via the hotkey on my keyboard (K750), the login screen is only shown
on the build-in screen and not on the external monitor. In this case
I would really like to test this, but I'm unable to boot into a kernel
from Trusty.
I installed
linux-headers-3.13.11-0313_3.13.11-0313.20141336_all.deb
linux-headers-3.13.11-0313-generic_3.13.11-0313.20141336_amd64.deb
Unfortunately, it seems like that the T450s is not fully supported by
Trusty. Suspend and resume doesn't even work when only the build-in
screen is used.
Thus, there is no way for me to test if this behavior does exist on
Trusty.
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Thanks for your response, Christopher.
I updated my BIOS to the latest version available:
JBET48WW (1.13 )
04/20/2015
Unfortunately, nothing has changed. The system still behaves like in the
initial post of this report.
** Changed in: xorg (Ubuntu)
Status: Incomplete = New
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By the way: Could this bug be related to systemd? I could imagine that,
because (a) this does not occur on Utopic and (b) I just found someone
having problems using an external screen, and those problems are related
to systemd (http://askubuntu.com/questions/613693/15-04-closing-lid-
Public bug reported:
I have an external screen connected to my machine (T450s, via docking
station) and after resuming from suspend, my external monitor is
disabled.
After some trial and error I made an interesting observation: The
external monitor only stops working if suspend via systemctl
** Description changed:
- After resuming from suspend, my external monitor is disabled.
+ I have an external screen connected to my machine (T450s, via docking
+ station) and after resuming from suspend, my external monitor is
+ disabled.
After some trial and error I made an interesting
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