Public bug reported:
Ubuntu version:
Description: Zorin OS 12.1 (Ubuntu 16.04 LTS)
Release: 12
Package:
gdm3:
Installed: 3.18.3-0ubuntu2
Candidate: 3.18.3-0ubuntu2
Version table:
*** 3.18.3-0ubuntu2 500
500 http://de.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
100 /var/lib/dpkg/status
Description:
This bug makes lets a window freeze, however the application inside it does not
freeze. It is not possible to focus the window anymore, nor to resize it. The
cursor does not change the icon to the resize icon and the window doesn't
respond to clicks or hovering events. However, the application itself is fine -
for example, Firefox will continue to play music. Alt+F4 to exit the
application still works. It has happened to me in Thunar, Sublime Text and
Firefox and the Gnome Shell, so I don't think the bug has to do with the
application. The title bar buttons may still work on the frozen window (see
below).
The window can be made responsible again by opening a second window and
having it partially, not completely (!) overlap the frozen window or by
resizing the window (does however not work with Super+Right shortcuts
for tiling, you have to move the mouse and click the "restore maximized
window" button). The bug often occurs after restoring a window to the
maximized state after it has been pushed into the background for a
prolonged time (as far as I can tell).
For example, if I put Firefox into the background to play music, leave
it in maximized state, open a text editor maximized so that Firefox is
completely hidden, come back 20 minutes later and bring Firefox in the
foreground, Firefox is almost (not always) guaranteed to be frozen, but
the music still plays.
It is possible that two windows freeze at the same time, for example, I
had two instances of Thunar (file manager) in the background, both
frozen and the title bar buttons didn't work either.
The bug occurs in several stages (not sure if two bugs or the same). About one
hour after logging in (as far as I can tell), some windows (noticably the ones
in the background, meaning not visible or completely hidden behind another
window) become unresponsive. Sometimes the title bar still works, at which
point you can unfreeze the window by clicking the "restore" button in the title
bar. In this stage, the window is only unresponsive to clicks and mouse focus
events.
Sometimes, this isn't possible either because the application has no window
decoration or because the title bar is not responding, too. In this stage the
window will not respond to a cursor hovering over the edge of the window. The
cursor won't change. Then you have to open another application window and have
it partially overlap the frozen window. The frozen window will immediately
become responsive again.
After stage 2 has happened about 5 times, the cursor will start to click about
100 pixels to the left. This has happened twice in different applications, not
sure if really related and a bug or just a "quirk" (?). The cursor will show
and the application is responsive, but the recorded click will be around 100
pixels to the left. An application restart fixes this problem.
The bug occurs randomly, I sadly can't give an exact estimate for when
it happens. It's just that when it starts, it will return in about 10 -
20 minutes after first occurence. I can't say if this happens on other
distributions or if this is a known bug. Zorin OS 12 is Ubuntu 16.04
with a themed GNOME window manager.
Hardware information:
H/W path Device Class Description
=======================================================
system 4236B87
/0 bus 4236B87
/0/1 processor Intel(R) Core(TM) i5-2520M CPU @ 2.5
/0/1/2 memory 64KiB L1 cache
/0/1/3 memory 256KiB L2 cache
/0/1/4 memory 3MiB L3 cache
/0/5 memory 4GiB System Memory
/0/5/0 memory 4GiB SODIMM DDR3 Synchronous 1333 MH
/0/5/1 memory DIMMProject-Id-Version: lshwReport-M
/0/e memory 128KiB BIOS
/0/100 bridge 2nd Generation Core Processor Family
/0/100/2 display 2nd Generation Core Processor Family
/0/100/16 communication 6 Series/C200 Series Chipset Family
/0/100/16.3 communication 6 Series/C200 Series Chipset Family
/0/100/19 enp0s25 network 82579LM Gigabit Network Connection
/0/100/1a bus 6 Series/C200 Series Chipset Family
/0/100/1a/1 usb1 bus EHCI Host Controller
/0/100/1a/1/1 bus Integrated Rate Matching Hub
/0/100/1a/1/1/4 communication Broadcom Bluetooth Device
/0/100/1a/1/1/6 multimedia Integrated Camera
/0/100/1b multimedia 6 Series/C200 Series Chipset Family
/0/100/1c bridge 6 Series/C200 Series Chipset Family
/0/100/1c.1 bridge 6 Series/C200 Series Chipset Family
/0/100/1c.1/0 wlp3s0 network Centrino Ultimate-N 6300
/0/100/1c.3 bridge 6 Series/C200 Series Chipset Family
/0/100/1c.4 bridge 6 Series/C200 Series Chipset Family
/0/100/1c.4/0 generic MMC/SD Host Controller
/0/100/1d bus 6 Series/C200 Series Chipset Family
/0/100/1d/1 usb2 bus EHCI Host Controller
/0/100/1d/1/1 bus Integrated Rate Matching Hub
/0/100/1d/1/1/5 generic Integrated Smart Card Reader
/0/100/1f bridge QM67 Express Chipset Family LPC Cont
/0/100/1f.2 storage 6 Series/C200 Series Chipset Family
/0/100/1f.3 bus 6 Series/C200 Series Chipset Family
/0/100/1f.5 storage 6 Series/C200 Series Chipset Family
/0/0 scsi0 storage
/0/0/0.0.0 /dev/sda disk 160GB ST9160412AS
/0/0/0.0.0/1 /dev/sda1 volume 145GiB EXT4 volume
/0/0/0.0.0/2 /dev/sda2 volume 3982MiB Extended partition
/0/0/0.0.0/2/5 /dev/sda5 volume 3982MiB Linux swap / Solaris partiti
/0/2 scsi1 storage
/0/2/0.0.0 /dev/cdrom disk DVD RW AD-7710H
/1 power 42T4911
Thank you for reading.
** Affects: gdm3 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1673650
Title:
Single window randomly freezes (no input possible)
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