ciao!

su Xorg.0.log non avevo trovato nulla.
ma penso di aver capito il problema.
in sostanza ho quelle due directories montate tramite cifs.
directories di un server windows che si trova in un'altra sede raggiunta tramite vpn.
da ieri la connessione di quella sede va e viene in continuazione (anche con intervalli di tre minuti), ed evidentemente gli dava fastidio.
infatti una volta smontate e levate dall'fstab nn ho più problemi.

anche qui vedo qualcosa al riguardo:
codice:
# journalctl --since "2016-11-29" -p err
-- Logs begin at sab 2015-10-03 15:34:33 CEST, end at mer 2016-11-30 08:44:03 CET. --
nov 29 09:07:21 matte-arch kernel: [drm:hsw_write_dcomp [i915]] *ERROR* Failed to write to D_COMP
nov 29 09:07:23 matte-arch kernel: sd 6:0:0:0: [sdc] Asking for cache data failed
nov 29 09:07:23 matte-arch kernel: sd 6:0:0:0: [sdc] Assuming drive cache: write through
nov 29 09:07:26 matte-arch ntpd[462]: bind(24) AF_INET6 fe80::cdee:7259:a9e3:4649%2#123 flags 0x11 failed: Cannot assign requested address
nov 29 09:07:26 matte-arch ntpd[462]: unable to create socket on enp3s0 (8) for fe80::cdee:7259:a9e3:4649%2#123
nov 29 09:07:28 matte-arch python3[892]: PAM unable to dlopen(/usr/lib/security/pam_gnome_keyring.so): /usr/lib/security/pam_gnome_keyring.so: impossibile aprire il file oggetto condiviso: File o directory non esis
nov 29 09:07:28 matte-arch python3[892]: PAM adding faulty module: /usr/lib/security/pam_gnome_keyring.so
-- Reboot --
nov 29 09:13:33 matte-arch kernel: ERROR: Unable to locate IOAPIC for GSI 37
nov 29 09:13:34 matte-arch kernel: sd 6:0:0:0: [sdc] Asking for cache data failed
nov 29 09:13:34 matte-arch kernel: sd 6:0:0:0: [sdc] Assuming drive cache: write through
-- Reboot --
nov 29 11:05:49 matte-arch kernel: ERROR: Unable to locate IOAPIC for GSI 37
nov 29 11:05:50 matte-arch kernel: sd 6:0:0:0: [sdc] Asking for cache data failed
nov 29 11:05:50 matte-arch kernel: sd 6:0:0:0: [sdc] Assuming drive cache: write through
nov 29 11:05:53 matte-arch ntpd[455]: bind(24) AF_INET6 fe80::cdee:7259:a9e3:4649%2#123 flags 0x11 failed: Cannot assign requested address
nov 29 11:05:53 matte-arch ntpd[455]: unable to create socket on enp3s0 (5) for fe80::cdee:7259:a9e3:4649%2#123
nov 29 11:48:47 matte-arch kernel: INFO: task cinnamon:814 blocked for more than 120 seconds.
nov 29 11:48:47 matte-arch kernel:       Tainted: P           O    4.8.11-1-ARCH #1
nov 29 11:48:47 matte-arch kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
nov 29 11:50:50 matte-arch kernel: INFO: task cinnamon:814 blocked for more than 120 seconds.
nov 29 11:50:50 matte-arch kernel:       Tainted: P           O    4.8.11-1-ARCH #1
nov 29 11:50:50 matte-arch kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
nov 29 11:52:53 matte-arch kernel: INFO: task cinnamon:814 blocked for more than 120 seconds.
nov 29 11:52:53 matte-arch kernel:       Tainted: P           O    4.8.11-1-ARCH #1
nov 29 11:52:53 matte-arch kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
nov 29 11:54:55 matte-arch login[4198]: pam_systemd(login:session): Failed to release session: Interrupted system call
........................................................................................................................................
anche se è strano, penso potrebbe essere quello il problema.