James, 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
(Applications->Accessories->Terminal), as it will automatically gather
and attach updated debug information to this report:
apport-collect -p linux <replace-with-bug-number>
** This bug is no longer a duplicate of bug 978891
ubuntu 12.04 doesn't boot when usb device plugged in (except usb mouse)
** Package changed: ubuntu => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
** Tags added: needs-kernel-logs needs-upstream-testing precise
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https://bugs.launchpad.net/bugs/963933
Title:
System freeze when hotplug 27" monitor in Ubuntu 12.04
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
I'm not sure if this is a bug yet, hence the question.
I have a Dell XPS 17" laptop (1920x1080 resolution) and recently got a
new Dell 27" monitor (2560x1440 res). The laptop has an nVidia
discrete card, but I don't actually have it set up (i.e. I haven't got
around to successfully setting up Bumblebee yet), so I'm assuming this
is all on the Intel card. The external monitor is connected via a Mini
Display Port to Dual-Link DVI (the Apple branded one) adapter, then
via DVI cable to the monitor (it's all I have around that works).
If I boot the laptop with the external monitor connected, everything
works perfectly (except the login screen goes very low res, but I can
live with that). However, if I unplug it while connected, the display
will go black with the mouse cursor still visible, and completely lock
up. Caps lock does not go on/off, will not respond to SysRq,
Ctrl+Alt+Del, switching to a different terminal (Ctrl+Alt+F1 etc.).
Only a hard reboot will do the job.
The same happens in all these scenarios:
- Unplugging the monitor when booted with it connected
- "Hot" plugging the monitor after booted
- Hitting "Apply" after making changes in System Settings > Display (e.g. if
I try to move the monitor positions around)
It's not a show stopper for me, I just must be careful not to do the
above, which can be inconvenient sometimes.
I am not sure where to even start looking, /var/log/syslog does not
seem to contain any useful information, nor does /var/log/dmesg.0 or
/var/log/Xorg.0.log
If I boot from cold with the monitor attached, and avoid the Display
settings, everything works perfectly - correct resolution etc.
System details follow:
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu precise (development branch)"
$ lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation Device 124d (rev ff)
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