Public bug reported:
After upgrading to Ubuntu 18.10 from Ubuntu 18.04, when logging in my one of my
two external displays will not be activated without hotplugging the other
external display.
The display settings app shows the second display as inactive, and when trying
to activate the settings app states that some hardware limitation stops it from
being possible to apply the change.
The laptop lid is closed, the internal laptop display is not active.
Hotplugging the other external display solves the problem - after
hotplug both external displays are active. This makes the bug annoying
but workaroundable.
I am not sure if this bug belongs to the Xorg package or the linux
package.
Hardware:
Thinkpad t430s laptop sitting in a Thinkpad 4338 docking station, with two
external displays connected through displayport (via docking station).
$ sudo lspci -v
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Lenovo 3rd Gen Core processor Graphics Controller
Flags: bus master, fast devsel, latency 0, IRQ 29
Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 6000 [size=64]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
Kernel modules: i915
$ apt-cache policy xorg
xorg:
Installed: 1:7.7+19ubuntu8
Candidate: 1:7.7+19ubuntu8
Version table:
*** 1:7.7+19ubuntu8 500
500 http://se.archive.ubuntu.com/ubuntu cosmic/main amd64 Packages
100 /var/lib/dpkg/status
$ apt-cache policy linux-image-4.18.0-10-generic
linux-image-4.18.0-10-generic:
Installed: 4.18.0-10.11
Candidate: 4.18.0-10.11
Version table:
*** 4.18.0-10.11 500
500 http://se.archive.ubuntu.com/ubuntu cosmic/main amd64 Packages
100 /var/lib/dpkg/status
$ lsb_release -rd
Description: Ubuntu 18.10
Release: 18.10
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1801898
Title:
Only one of two external (displayport) displays is working without
hotplug
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