Public bug reported:
Since upgrade to 14.04, the external display on DP1 is extremely
unstable. I get constant "[drm:intel_dp_i2c_aux_ch] *ERROR* too many
retries, giving up" messages over dmesg. I used to get those with 13.10,
but there was no stability issue. Once the laptop (Lenovo X220) is
connected to the monitor (resolution is 2560x1600), if I run any program
like xrandr or unity-control-center, the system immediately reverts from
the external display to the laptop display, and often crashes becoming
unresponsive. Every time I run xrandr or unity-control-center, it
triggers 20 "[drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving
up" messages in dmesg and if I am using the external monitor it further
triggers a reproducible crash. It is possible that this might be related
to the DVI->DP adapter I am using. Due to an unresolved bug, the correct
EDID for the monitor is not recognized, and I have to manually add that
after each boot.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-24-generic 3.13.0-24.46
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: genovese 2538 F.... pulseaudio
CurrentDesktop: Unity
Date: Tue Apr 29 10:00:31 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-01-21 (463 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: LENOVO 42872WU
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic
root=UUID=1f880233-e827-4c00-b11a-2c7a4eb76497 ro quiet splash nomdmonddf
nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw
nomdmonddf nomdmonisw nomdmonddf nomdmonisw vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-24-generic N/A
linux-backports-modules-3.13.0-24-generic N/A
linux-firmware 1.127
SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2014-04-18 (10 days ago)
dmi.bios.date: 08/31/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET64WW (1.34 )
dmi.board.asset.tag: Not Available
dmi.board.name: 42872WU
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr8DET64WW(1.34):bd08/31/2012:svnLENOVO:pn42872WU:pvrThinkPadX220:rvnLENOVO:rn42872WU:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 42872WU
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
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https://bugs.launchpad.net/bugs/1314213
Title:
External DP1 monitor extremely unstable since upgrade to 14.04
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