Hi, thanks for you promptly response, unfortunately only now I had the
time to check the things above.

The HWE is the latest:
``` 
~$ sudo apt-get install --install-recommends linux-generic-hwe-16.04 
xserver-xorg-hwe-16.04 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
linux-generic-hwe-16.04 is already the newest version (4.13.0.43.62).
xserver-xorg-hwe-16.04 is already the newest version (1:7.7+16ubuntu3~16.04.1).
The following packages were automatically installed and are no longer required:
  dkms libllvm4.0 linux-headers-4.10.0-28 linux-headers-4.10.0-28-generic 
linux-image-4.10.0-28-generic linux-image-extra-4.10.0-28-generic
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 23 not upgraded.
```

The the bios is now updated, but the issue persists.

```
atritoman@atritoman-HP-EliteBook-840-G1:~$ sudo dmidecode -t 0
# dmidecode 3.0
Getting SMBIOS data from sysfs.
SMBIOS 2.7 present.

Handle 0x000D, DMI type 0, 24 bytes
BIOS Information
        Vendor: Hewlett-Packard
        Version: L71 Ver. 01.44
        Release Date: 04/12/2018
        Address: 0xF0000
        Runtime Size: 64 kB
        ROM Size: 8192 kB
        Characteristics:
                PCI is supported
                PC Card (PCMCIA) is supported
                BIOS is upgradeable
                BIOS shadowing is allowed
                Boot from CD is supported
                Selectable boot is supported
                EDD is supported
                Print screen service is supported (int 5h)
                8042 keyboard services are supported (int 9h)
                Serial services are supported (int 14h)
                Printer services are supported (int 17h)
                ACPI is supported
                USB legacy is supported
                Smart battery is supported
                BIOS boot specification is supported
                Function key-initiated network boot is supported
                Targeted content distribution is supported
                UEFI is supported
        BIOS Revision: 1.44
        Firmware Revision: 21.89
```

Meanwhile I had to reinstall ubuntu 16.04, its the default with Unity, same 
behavior.
When I've started the newly reinstalled system, it seemed to work well, the 
dual display, after a reboot or two, it stoped working.

The login screen works well and displays with dual display when I
restart the laptop, but after I login it crashes, and it seems to
restart the graphic environment/xserver maybe ...

I can post some additional logs.

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1771539

Title:
  Xorg crash

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1771539/+subscriptions

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