Public bug reported:

After a screen lock, the screen hangs, with the attached stack dump in
dmesg.

I've seen multiple bug reports with similar effect, but the workaround
has been "video=SVIDEO-1:d" as boot parameters, but this does not affect
my case. Also, the other reports, such as
https://bugs.freedesktop.org/show_bug.cgi?id=93782, includes
'intel_tv_detect' which mine does not.

lspci:
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family 
DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core 
Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series 
Chipset Family MEI Controller #1 (rev 04)
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network 
Connection (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family 
USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family 
High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI 
Express Root Port 1 (rev b4)
00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI 
Express Root Port 2 (rev b4)
00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI 
Express Root Port 3 (rev b4)
00:1c.5 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI 
Express Root Port 6 (rev b4)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family 
USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation QM67 Express Chipset Family LPC 
Controller (rev 04)
00:1f.2 RAID bus controller: Intel Corporation 82801 Mobile SATA Controller 
[RAID mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus 
Controller (rev 04)
02:00.0 Network controller: Broadcom Corporation BCM43228 802.11a/b/g/n
09:00.0 SD Host controller: O2 Micro, Inc. OZ600FJ0/OZ900FJ0/OZ600FJS SD/MMC 
Card Reader Controller (rev 05)
09:00.1 Mass storage controller: O2 Micro, Inc. Device 8231 (rev 03)

ProblemType: Bug
DistroRelease: elementary 0.4
Package: linux-image-4.4.0-77-generic 4.4.0-77.98 [origin: Ubuntu]
ProcVersionSignature: Ubuntu 4.4.0-77.98-generic 4.4.59
Uname: Linux 4.4.0-77-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  thoni56    1567 F.... pulseaudio
Date: Tue May  9 22:40:05 2017
HibernationDevice: RESUME=UUID=924774bb-ccbe-446b-a22e-2caa4b84f3b6
InstallationDate: Installed on 2017-05-03 (5 days ago)
InstallationMedia: Lubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.2)
MachineType: Dell Inc. Latitude E6220
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-77-generic 
root=UUID=4238aca4-33a0-457b-81fa-81d7b2316a6c ro quiet splash video=SVIDEO-1:d 
vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-77-generic N/A
 linux-backports-modules-4.4.0-77-generic  N/A
 linux-firmware                            1.157.8
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/28/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A12
dmi.board.name: 0R97MN
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA12:bd06/28/2013:svnDellInc.:pnLatitudeE6220:pvr01:rvnDellInc.:rn0R97MN:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6220
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug loki third-party-packages

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https://bugs.launchpad.net/bugs/1689651

Title:
  vblank wait timed out on crtc 0 after screen lock on Dell Latitude
  e6220

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