System info and dmesg text before error message:

$ inxi -F
System:    Host: ubuntu-mate Kernel: 4.8.0-36-generic x86_64 (64 bit)
           Desktop: MATE 1.12.1  Distro: Ubuntu 16.04 xenial
Machine:   System: Dell product: Latitude D630
           Mobo: Dell model: 0KU184 Bios: Dell v: A03 date: 07/23/2007
CPU:       Dual core Intel Core2 Duo T7100 (-MCP-) cache: 2048 KB
           clock speeds: max: 1801 MHz 1: 1200 MHz 2: 1800 MHz
Graphics:  Card: Intel Mobile GM965/GL960 Integrated Graphics Controller (primary)
           Display Server: X.Org 1.18.4 drivers: (unloaded: fbdev,vesa)
           Resolution: 1440x900@60.00hz
           GLX Renderer: Mesa DRI Intel 965GM GLX Version: 2.1 Mesa 12.0.6
Audio:     Card Intel 82801H (ICH8 Family) HD Audio Controller
           driver: snd_hda_intel
           Sound: Advanced Linux Sound Architecture v: k4.8.0-36-generic
Network:   Card-1: Broadcom NetXtreme BCM5755M Gigabit Ethernet PCI Express
           driver: tg3
           IF: enp9s0 state: up speed: 100 Mbps duplex: full
           mac: 00:1c:23:1b:d9:49
           Card-2: Intel PRO/Wireless 4965 AG or AGN [Kedron] Network Connection
           driver: iwl4965
           IF: wlp12s0 state: down mac: 00:21:5c:40:17:f1
Drives:    HDD Total Size: 96.0GB (2.1% used)
           ID-1: /dev/sda model: FUJITSU_MHV2080B size: 80.0GB
           ID-2: USB /dev/sdb model: Cruzer_Glide size: 16.0GB
Partition: ID-1: swap-1 size: 2.14GB used: 0.00GB (0%) fs: swap dev: /dev/sda5
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   None detected - is lm-sensors installed and configured?
Info:      Processes: 183 Uptime: 6 min Memory: 917.2/1990.4MB
           Client: Shell (bash) inxi: 2.2.35


==========
dmesg
...
[   20.990839] ------------[ cut here ]------------
[   20.990864] WARNING: CPU: 0 PID: 114 at /build/linux-hwe-eyfT8D/linux-hwe-4.8
.0/drivers/gpu/drm/drm_irq.c:1224 drm_wait_one_vblank+0x1b6/0x1c0 [drm]
[   20.990866] vblank wait timed out on crtc 0
[   20.990867] Modules linked in: uas psmouse usb_storage firewire_ohci firewire
_core i915 crc_itu_t tg3 pata_acpi i2c_algo_bit ptp drm_kms_helper pps_core sysc
opyarea sysfillrect sysimgblt wmi fb_sys_fops drm video
[   20.990892] CPU: 0 PID: 114 Comm: kworker/u4:3 Tainted: G        W       4.8.
0-36-generic #36~16.04.1-Ubuntu
[   20.990893] Hardware name: Dell Inc. Latitude D630                   /0KU184,
 BIOS A03 07/23/2007
[   20.990897] Workqueue: events_unbound async_run_entry_fn
[   20.990900]  0000000000000286 0000000087ba6e01 ffff88cff97bb898 ffffffff83c2d7b3
[   20.990906]  ffff88cff97bb8e8 0000000000000000 ffff88cff97bb8d8 ffffffff8388313b
[   20.990911]  000004c800000296 ffff88cff9a60000 0000000000000000 0000000000000000
[   20.990916] Call Trace:
[   20.990920]  [<ffffffff83c2d7b3>] dump_stack+0x63/0x90
[   20.990924]  [<ffffffff8388313b>] __warn+0xcb/0xf0
[   20.990927]  [<ffffffff838831bf>] warn_slowpath_fmt+0x5f/0x80
[   20.990931]  [<ffffffff838c7025>] ? finish_wait+0x55/0x70
[   20.990954]  [<ffffffffc01a1b96>] drm_wait_one_vblank+0x1b6/0x1c0 [drm]
[   20.990957]  [<ffffffff838c74d0>] ? wake_atomic_t_function+0x60/0x60
[   20.991017]  [<ffffffffc031fcd7>] intel_pre_plane_update+0x1a7/0x1b0 [i915]
[   20.991062]  [<ffffffffc0320364>] intel_atomic_commit_tail+0x154/0x10a0 [i915
]
[   20.991065]  [<ffffffff83a0a991>] ? kmem_cache_alloc_trace+0x1a1/0x1c0
[   20.991114]  [<ffffffffc0329443>] ? intel_prepare_plane_fb+0xa3/0x280 [i915]
[   20.991155]  [<ffffffffc03216f0>] intel_atomic_commit+0x440/0x570 [i915]
[   20.991173]  [<ffffffffc01ba6c7>] ? drm_atomic_check_only+0x187/0x610 [drm]
[   20.991175]  [<ffffffff838c7025>] ? finish_wait+0x55/0x70
[   20.991193]  [<ffffffffc01bab87>] drm_atomic_commit+0x37/0x60 [drm]
[   20.991234]  [<ffffffffc0326ed3>] intel_release_load_detect_pipe+0x23/0x80 [i
915]
[   20.991276]  [<ffffffffc0363420>] intel_tv_detect+0x330/0x5e0 [i915]
[   20.991284]  [<ffffffffc023302c>] drm_helper_probe_single_connector_modes+0x2
7c/0x540 [drm_kms_helper]
[   20.991294]  [<ffffffffc0241c0e>] drm_fb_helper_initial_config+0xae/0x420 [dr
m_kms_helper]
[   20.991334]  [<ffffffffc033c538>] intel_fbdev_initial_config+0x18/0x30 [i915]
[   20.991336]  [<ffffffff838a6aa7>] async_run_entry_fn+0x37/0x150
[   20.991338]  [<ffffffff8389d8eb>] process_one_work+0x16b/0x4a0
[   20.991340]  [<ffffffff8389dc6b>] worker_thread+0x4b/0x500
[   20.991342]  [<ffffffff8389dc20>] ? process_one_work+0x4a0/0x4a0
[   20.991344]  [<ffffffff838a4008>] kthread+0xd8/0xf0
[   20.991347]  [<ffffffff8409679f>] ret_from_fork+0x1f/0x40
[   20.991349]  [<ffffffff838a3f30>] ? kthread_create_on_node+0x1e0/0x1e0
[   20.991350] ---[ end trace 9b2af52b8b8af477 ]---
[   21.058481] fbcon: inteldrmfb (fb0) is primary device
[   21.910167] Console: switching to colour frame buffer device 180x56
[   21.931104] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[   32.224069] [drm:drm_atomic_helper_commit_cleanup_done [drm_kms_helper]] *ERR
OR* [CRTC:26:pipe A] flip_done timed out
[   32.328045] ------------[ cut here ]------------