Laptop goes to suspend randomly , and always when i log off - and then try to log on again

Support & Help Requests Hardware
#1

I have a strange issue.

I have notice that sometimes my laptop just goes to suspend even i have turned off this option.
Also this always happens when i log off - and then try to log on.
Laptop model is: HP 8470p with i5 and intel graphics.

I am using it on docking station - so laptop lid is always closed and i have connected external monitor,mouse and keyboard.

i have notice some errors in dmesg.
[ 15.342637] [drm:intel_set_pch_fifo_underrun_reporting [i915]] ERROR uncleared pch fifo underrun on pch transcoder A
[ 15.342658] [drm:intel_pch_fifo_underrun_irq_handler [i915]] ERROR PCH transcoder A FIFO underrun

and:

[ 84.264267] mate-panel[1561]: segfault at 6 ip 00007f520a767885 sp 00007ffe44525808 error 4 in libgobject-2.0.so.0.4600.1[7f520a733000+52000]
[ 91.843634] e1000e: enp0s25 NIC Link is Down
[ 92.168522] PM: Syncing filesystems … done.
[ 92.662949] PM: Preparing system for sleep (mem)
…

#2

Try running the following commands and restart if anything updates, it might fix the problem for you?:

sudo apt-get --fix-missing install

The above command downloads and installs any missing packages on your system.

sudo apt-get --fix-broken install

The above command downloads and installs any broken dependencies on your system.

#3

Sorry for the late answer, i decided to reinstall ubuntu-mate 15.10 and now this is not happening.
Thank you very much wolfman - those are new commands that i have learnd for troubleshooting.

Regards,
Vlada

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