Bug#830260: gnome-terminal: Keyboard typing lags if no other WM activity

[Igor Bogomazov]

Package: gnome-terminal
Version: 3.20.2-1
Severity: normal

What I do:

ensure there is no gnome-terminal running (ps -A | grep gnome-terminal)
run gnome-terminal
type 's'
press Backspace
repeat typing-pressing a few times

What I see:

a few seconds delay before 's' appears after typing or gets erased once
backspace is pressed; the delay is quite random from sub-seconds to
tens of seconds; constantly moving mouse pointer around or clicking it,
causes 's' to appear/disappear immediately, changing window focus also
helps, but typing more - does not help, whole text typed in blind
appears with a delay

What I expect:

immediate UI reponse even if no other WM activity

When I noticed the issue:

after the recent upgrade of a number of packets


I see the same lagging using firefox too, but most applications are
fine, among them other terminal emulators (mlterm and xterm) and gtk-3
app evince. When I try to debug with strace, responsiveness is
excellent.


-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.6.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gnome-terminal depends on:
ii  dconf-gsettings-backend [gsettings-backend]  0.26.0-1
ii  gconf-service                                3.2.6-3
ii  gnome-terminal-data                          3.20.2-1
ii  gsettings-desktop-schemas                    3.20.0-3
ii  libatk1.0-0                                  2.20.0-1
ii  libc6                                        2.23-1
ii  libcairo-gobject2                            1.14.6-1+b1
ii  libcairo2                                    1.14.6-1+b1
ii  libdconf1                                    0.26.0-1
ii  libgconf-2-4                                 3.2.6-3
ii  libgdk-pixbuf2.0-0                           2.34.0-1
ii  libglib2.0-0                                 2.48.1-1
ii  libgtk-3-0                                   3.20.6-2
ii  libnautilus-extension1a                      3.20.1-3
ii  libpango-1.0-0                               1.40.1-1
ii  libpangocairo-1.0-0                          1.40.1-1
ii  libuuid1                                     2.28-5
ii  libvte-2.91-0                                0.44.2-1
ii  libx11-6                                     2:1.6.3-1

Versions of packages gnome-terminal recommends:
ii  dbus-x11  1.10.8-1
ii  gvfs      1.28.2-1
ii  yelp      3.20.1-1

gnome-terminal suggests no packages.

-- no debconf information