X needs a restart after suspend to drive 1920x1200 over displayport

[John Lenton]

After suspend, my displayport-connected monitor will (most often) no longer work at the native 1920x1200 resolution.

Restarting X fixes it.

This is not a new problem, but I always thought I had a wonky cable. I only recently noticed the suspend issue, and only just now the restart thing.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu7
ProcVersionSignature: Ubuntu 3.13.0-3.18-generic 3.13.0-rc8
Uname: Linux 3.13.0-3-generic i686
.tmp.unity.support.test.0:

ApportVersion: 2.13.1-0ubuntu1
Architecture: i386
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Wed Jan 15 23:34:15 2014
DistUpgraded: 2013-11-13 06:53:48,566 DEBUG enabling apt cron job
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 4.3.2, 3.13.0-2-generic, i686: installed
 virtualbox, 4.3.2, 3.13.0-3-generic, i686: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:040b]
InstallationDate: Installed on 2010-10-09 (1194 days ago)
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release Candidate i386 (20100928.1)
MachineType: Dell Inc. Latitude E6510
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-3-generic root=UUID=91fb320e-557c-4d33-a8a7-0a1e432ad2f0 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to trusty on 2013-11-13 (63 days ago)
dmi.bios.date: 12/05/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A16
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA16:bd12/05/2013:svnDellInc.:pnLatitudeE6510:pvr0001:rvnDellInc.:rn:rvr:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6510
dmi.product.version: 0001
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
version.libdrm2: libdrm2 2.4.50-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.0.1-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental 10.0.1-1ubuntu2
version.libgl1-mesa-glx: libgl1-mesa-glx 10.0.1-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.14.5-1ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.907-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Wed Jan 15 23:33:31 2014
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 0
 vendor LGD
xserver.version: 2:1.14.5-1ubuntu2

[Timo Aaltonen (tjaalton)]

guessing it's an intel bug probably in the kernel

[Chris Wilson (ickle)]

What exactly do you mean by not work? (Monitor off, or has signal but black, or flashing no signal?)

Please describe the sequence of events and your observations. (Preferrably with something like xrandr at each point to see what the hardware thinks).

E.g.
1. Before suspend. Obs: eDP at native, DP at native
2. Suspend. Obs: everything shuts down
3. Resume. Obs: eDP at native, DP off
4. Restart X. Obs: eDP at native, DP at native.

[Launchpad Janitor (janitor)]

[Expired for xserver-xorg-video-intel (Ubuntu) because there has been no activity for 60 days.]