[Radeon HD 6290] xorg crashes when turning on external monitor

[Artemgy]

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. The only solution is to hard reset the computer by holding the power button down for 4 seconds.

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

DIAGNOSTICS

$ lsb_release -rd
Description: Ubuntu 14.10
Release: 14.10

DIAGNOSTICS 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)

[Artemgy (artemgy)]

Other diagnostic information attached...

# credit - https://wiki.ubuntu.com/X/Troubleshooting/Freeze#Reporting_GPU_lockup_Bugs
sudo apt-get install radeontool
sudo avivotool regs all > regdump_good.txt

# provoke the issue, then...
# credit - https://wiki.ubuntu.com/X/Troubleshooting/Freeze#Gathering_Register_Dumps
dmesg > dmesg.txt
cp /var/log/Xorg.0.log Xorg.0.log
sudo avivotool regs all > regdump_broke.txt

[penalvch (penalvch)]

Artemgy, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in the development release from a Terminal as it will automatically gather and attach updated debug information to this report:

apport-collect -p xorg 1407529

Please ensure you have xdiagnose installed, and that you click the Yes button for attaching additional debugging information.

As well, given the information from the prior release is already available, testing a release prior to the development one would not be helpful.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

[Launchpad Janitor (janitor)]

[Expired for xorg (Ubuntu) because there has been no activity for 60 days.]