Kai Mast:
1) As per the sticker of the monitor itself (not from the Bug
Description, or the result of a terminal command), could you please
provide the full monitor manufacturer and model?
2) Regarding how you have the monitor connected, is this straight into
the computer's miniDP cable, mDP to something else adapter, etc.?
3) Did this issue start to happen after an update? If so, which and when
precisely?
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Confirmed => Incomplete
** Summary changed:
- Laptop sometimes doesn't detect external monitor
+ [Lenovo ThinkPad T440s] Laptop sometimes doesn't detect external monitor
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https://bugs.launchpad.net/bugs/1552040
Title:
[Lenovo ThinkPad T440s] Laptop sometimes doesn't detect external
monitor
Status in xserver-xorg-video-intel package in Ubuntu:
Incomplete
Bug description:
Usually a reboot fixes the problem. I see stuff like this in dmesg.
[15294.887642] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting
for DDI BUF C idle bit
[15295.568309] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too
many voltage retries, give up
[15295.587193] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting
for DDI BUF C idle bit
[15296.267547] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too
many voltage retries, give up
[15296.286426] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting
for DDI BUF C idle bit
[15296.886015] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too
many voltage retries, give up
[15296.886264] [drm:intel_dp_link_training_channel_equalization [i915]]
*ERROR* failed to train DP, aborting
[15296.898472] [drm:intel_dp_link_training_channel_equalization [i915]]
*ERROR* Timed out waiting for DP idle patterns
[15296.899688] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting
for DDI BUF C idle bit
[15297.579305] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too
many voltage retries, give up
[15297.598328] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting
for DDI BUF C idle bit
[15298.279238] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too
many voltage retries, give up
[15298.298275] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting
for DDI BUF C idle bit
[15298.965500] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too
many voltage retries, give up
[15298.984539] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting
for DDI BUF C idle bit
[15299.665619] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too
many voltage retries, give up
[15299.684522] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting
for DDI BUF C idle bit
[15300.367119] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too
many voltage retries, give up
[15300.386173] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting
for DDI BUF C idle bit
[15301.067203] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too
many voltage retries, give up
[15301.086097] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting
for DDI BUF C idle bit
[15301.768998] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too
many voltage retries, give up
[15301.769703] [drm:intel_dp_link_training_channel_equalization [i915]]
*ERROR* failed to train DP, aborting
[15301.781947] [drm:intel_dp_link_training_channel_equalization [i915]]
*ERROR* Timed out waiting for DP idle patterns
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xserver-xorg-video-intel 2:2.99.917+git20160218-1ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-8.23-generic 4.4.2
Uname: Linux 4.4.0-8-generic x86_64
.tmp.unity.support.test.0:
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
BootLog: [[0;32m OK [0m] Started LSB: Speech Dispatcher.
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Tue Mar 1 20:58:27 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16]
(rev 09) (prog-if 00 [VGA controller])
Subsystem: Lenovo Haswell-ULT Integrated Graphics Controller [17aa:220c]
InstallationDate: Installed on 2016-02-26 (5 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160224)
MachineType: LENOVO 20AQS00500
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-8-generic
root=UUID=bb8da1f1-8970-435e-aeaf-d7e1d9aa8a4e ro quiet splash vt.handoff=7
SourcePackage: xserver-xorg-video-intel
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/21/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: GJET85WW (2.35 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20AQS00500
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvrGJET85WW(2.35):bd09/21/2015:svnLENOVO:pn20AQS00500:pvrThinkPadT440s:rvnLENOVO:rn20AQS00500:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 20AQS00500
dmi.product.version: ThinkPad T440s
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.2+16.04.20160209-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.2-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.2-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20160218-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1
xserver.bootTime: Tue Mar 1 12:11:39 2016
xserver.configfile: default
xserver.errors: systemd-logind: failed to get session: PID 832 does not
belong to any known session
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
product id 12350
vendor AUO
xserver.version: 2:1.17.3-2ubuntu4
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