Paulo Marcel Coelho Aragão's questions

Sometimes when resuming from suspend, my screen goes black, no input is accepted, and I'm forced to hard reboot. I discovered a core file, so I ran

sudo gdb --core=/core

which output:

Core was generated by `/usr/lib/xorg/Xorg -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -noliste'.
Program terminated with signal SIGBUS, Bus error.

There was no info in /var/log/Xor.0.log.old, apport generated a crash report under /var/crash but I couldn't decypher any meaningful info from it, /var/log/apport.log had a suspicious entry for the time of the crash:

ERROR: apport (pid 2725) Sat Jun  2 06:11:13 2018: is_closing_session(): no DBUS_SESSION_BUS_ADDRESS in environment

My graphics card uses driver i915 from package xserver-xorg-video-intel, so I installed xserver-xorg-video-intel-dbg to have its debugging symbols. All web pages about X debugging recommended installing xserver-xorg-core-dbg, but this package doesn't exist since Ubuntu 16.04, and I haven't found any equivalent package.

Does anybody know what package to install to get X core debugging symbols ?

When my Xubuntu 18.04 laptop resumes from suspend, systemd-logind automatically logs out of the current session if the laptop has stayed suspended for more than a couple of hours. If the interval between suspend and resume is short, it doesn't log out. I still haven't discovered how long this interval has to be in order to cause the logout.

I enabled debug on the systemd-logind.service, creating file /etc/systemd/system/systemd-logind.service.d/10-debug.conf:

[Service]
Environment=SYSTEMD_LOG_LEVEL=debug

which causes systemd-logind to log all D-Bus messages it handles, but couldn't spot anything that might have caused the logout.

I scanned all systemd journal messages (journalctl) before systemd-logind starts killing the current session, investigated all that looked suspicious but couldn't find anything that might influence an automatic logout. Here are some of the messages that striked me as suspicious (they are not sequential, but pulled from different occasions):

upowerd[1600]: unhandled action 'unbind' on /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.0
polkitd(authority=local)[840]: Unregistered Authentication Agent for unix-session:c2 (system bus name :1.46, object path /org/gnome/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
wpa_supplicant[811]: dbus: fill_dict_with_properties dbus_interface=fi.w1.wpa_supplicant1.Interface dbus_property=Stations getter failed
wpa_supplicant[811]: dbus: wpa_dbus_get_object_properties: failed to get object properties: (none) none
at-spi-bus-launcher[7031]: XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":0.0"
at-spi-bus-launcher[7031]:       after 30333 requests (30333 known processed) with 0 events remaining.
systemd-logind[779]: Inhibitor xfce4-power-manager (xfce4-power-manager handles these events) pid=8611 uid=1000 mode=block stopped
systemd-logind[779]: Electing new display for user paulo
systemd-logind[779]: Ignoring session c8

logind config doesn't have anything that might cause this:

paulo:~$ loginctl show-session
EnableWallMessages=no
NAutoVTs=6
KillUserProcesses=no
RebootToFirmwareSetup=no
IdleHint=no
IdleSinceHint=0
IdleSinceHintMonotonic=0
BlockInhibited=handle-power-key:handle-suspend-key:handle-hibernate-key
DelayInhibited=sleep
InhibitDelayMaxUSec=5s
HandlePowerKey=poweroff
HandleSuspendKey=suspend
HandleHibernateKey=hibernate
HandleLidSwitch=suspend
HandleLidSwitchDocked=ignore
HoldoffTimeoutUSec=30s
IdleAction=ignore
IdleActionUSec=30min
PreparingForShutdown=no
PreparingForSleep=no
Docked=no
RemoveIPC=yes
RuntimeDirectorySize=615313408
InhibitorsMax=8192
NCurrentInhibitors=5
SessionsMax=8192
NCurrentSessions=1
UserTasksMax=10813

I can't find any anything that might cause an automatic logout after a time interval. I'm really stumped.

tmux can put text into the system clipboard using ANSI OSC (Operating System Control) 52 escape sequences, but the terminal emulator needs to recognize them. xfce4-terminal, out-of-the-box doesn't seem to recognize them. Would anybody know how to configure xfce4-terminal to recognize these OSC 52 sequences ?

I've read here that gnome-terminal can't recognize them, so I started to suspect that xfce4-terminal might not too, but couldn't find info anywhere about it.

I'm running Xubuntu 17.10 with xfce4-terminal 0.8.6.

I've just installed xubuntu 17.10 and cannot change xfce4-terminal keyboard shortcuts. I tried enabling editable accelerators (according to http://docs.xfce.org/faq), running:

Appearance -> Settings -> Menus and Buttons -> Enable editable accelerators: Tick

but when I hover the mouse over any menu item and press any key combination, nothing happens; I can see all shortcuts are greyed out, indicating that they can't be changed. I closed/reopened xfce4-terminal, and also logged out/in from the xfce session, to no avail, still can't change the shortcuts.

Don't know what changed in xfce because I remember being able to do this in past versions. I'm running fresh xubuntu 17.10, so xfce is version 4.12.3 and xfce4-terminal is 0.8.6-0ubuntu1.

Would anybody know how to change them ?

EDIT: I've just discovered that they can be changed editing:

~/.config/xfce4/terminal/accels.scm

Remove the leading ; from the menu entry and edit the shortcut. xfce4-terminal has to be closed/reopened for the new shortcuts to take effect. Not sure if this is the standard way of doing it, but at least it works.

EDIT 2: Found a good explanation about it here