Public bug reported:
== Steps to reproduce ==
* Insert HDMI cable to external monitor
* Start Menu / Preferences / Monitor Settings
* Quick Options / Show the same screen on both laptop LCD and external monitor
X will freeze immediately, mouse is blocked, CTRL-ALT-F1 does not
respond, only direct hardware function keys (like screen brightness /
disable wifi) respond
== Test cases ==
Systems FAILS with this issue following a system update - regressing to
previous kernel the system WORKS as expected, installing mainline kernel the
system WORKS as before...
$ cat /proc/version
FAILS Linux version 3.16.0-28-generic (buildd@komainu) (gcc version 4.9.1
(Ubuntu 4.9.1-16ubuntu6) ) #38-Ubuntu SMP Fri Dec 12 17:37:40 UTC 2014
WORKS Linux version 3.16.0-25-generic (buildd@komainu) (gcc version 4.9.1
(Ubuntu 4.9.1-16ubuntu6) ) #33-Ubuntu SMP Tue Nov 4 12:06:54 UTC 2014
WORKS Linux version 3.19.0-031900rc2-generic (apw@tangerine) (gcc version 4.6.3
(Ubuntu/Linaro 4.6.3-1ubuntu5) ) #201412290135 SMP Mon Dec 29 01:36:54 UTC 2014
$ lsb_release -rd
Description: Ubuntu 14.10
Release: 14.10
== diagnostic attached ==
$ sudo lshw -C video > lshw_video.txt
ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: xorg 1:7.7+7ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
Uname: Linux 3.16.0-28-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
Date: Mon Jan 5 01:04:17 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-10-16 (80 days ago)
InstallationMedia: Lubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20141016)
ProcEnviron:
TERM=xterm
SHELL=/bin/bash
PATH=(custom, user)
LANG=en_GB.UTF-8
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug utopic
** Attachment added: "lshw_video.txt"
https://bugs.launchpad.net/bugs/1407529/+attachment/4292113/+files/lshw_video.txt
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https://bugs.launchpad.net/bugs/1407529
Title:
[Radeon HD 6290] xorg freezes when turning on external monitor
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