OK, I'm on 4.8.0-45 now and it's working well again.
Will close this for now.
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1651454
Title:
[Lenovo Thinkpad T460p] Ultra Dock external displays not detected
after suspend/resume cycle
Status in linux package in Ubuntu:
Fix Released
Bug description:
The bug is identical to the expired
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1568573 where a
new report was requested.
This time around with a fresh install of 16.10 amd64 on a Thinkpad
T460p and a Lenovo Ultra Dock with two external monitors.
The setup does work when freshly booting with the laptop on the dock.
Suspending undocked, docking, resuming doesn't light up the external monitors.
Neither does just docking awake.
The relevant error messages seem to be these:
Dec 20 13:21:50 talas kernel: [265391.482117]
[drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage
retries, give up
Dec 20 13:21:50 talas kernel: [265391.498583] [drm:intel_wait_ddi_buf_idle
[i915]] *ERROR* Timeout waiting for DDI BUF D idle bit
Other relevant bug reports might be:
https://bugzilla.redhat.com/show_bug.cgi?id=1316877
https://bbs.archlinux.org/viewtopic.php?id=209791
ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: linux-image-4.8.0-30-generic 4.8.0-30.32
ProcVersionSignature: Ubuntu 4.8.0-30.32-generic 4.8.6
Uname: Linux 4.8.0-30-generic x86_64
ApportVersion: 2.20.3-0ubuntu8.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: donjan 2341 F.... pulseaudio
/dev/snd/pcmC1D0p: donjan 2341 F...m pulseaudio
/dev/snd/controlC1: donjan 2341 F.... pulseaudio
CurrentDesktop: GNOME-Flashback:Unity
Date: Tue Dec 20 15:36:08 2016
InstallationDate: Installed on 2016-10-25 (56 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
MachineType: LENOVO 20FXS0Y200
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-30-generic
root=UUID=104820cc-7d87-46d1-a1aa-e650ff221603 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.8.0-30-generic N/A
linux-backports-modules-4.8.0-30-generic N/A
linux-firmware 1.161
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/26/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: R07ET71W (2.11 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20FXS0Y200
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: None
dmi.modalias:
dmi:bvnLENOVO:bvrR07ET71W(2.11):bd09/26/2016:svnLENOVO:pn20FXS0Y200:pvrThinkPadT460p:rvnLENOVO:rn20FXS0Y200:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20FXS0Y200
dmi.product.version: ThinkPad T460p
dmi.sys.vendor: LENOVO
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