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Description of problem: With at least my own Lenovo T440p and work Lenovo T450, both with Intel graphics, at least when I boot the system in the dock, then if I undock and then re-dock, the system does not recognize the monitor or monitors connected to the dock and displays only on the built-in laptop display. It is likely that the problem happens only if the laptop goes to sleep while undocked. Version-Release number of selected component (if applicable): kernel-4.4.4-301.fc23.x86_64 kernel-4.4.5-300.fc23.x86_64 kernel-4.4.6-300.fc23.x86_64 How reproducible: Reliably. Steps to Reproduce: 1. Boot in dock 2. Undock, sleep, wake up, redock 3. Re-dock Actual results: Monitor connected to dock is unused, monitor not recognized. Errors in dmesg: [466015.768753] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466015.770286] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466016.454062] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [466016.454080] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466016.473116] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466016.474667] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466017.158445] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [466017.158470] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466017.177484] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466017.178993] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466017.862409] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [466017.862426] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466017.881464] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466017.883014] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466018.566108] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [466018.566123] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466018.585145] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466018.585175] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466018.586714] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466019.270016] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [466019.270046] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466019.289054] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466019.289090] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466019.290639] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466019.974681] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [466019.974699] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466019.993736] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466019.993770] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466019.995315] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466020.678827] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [466020.678867] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466020.679332] [drm:intel_dp_link_training_channel_equalization [i915]] *ERROR* failed to train DP, aborting [466020.679370] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466020.681486] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466020.683521] [drm:intel_dp_link_training_channel_equalization [i915]] *ERROR* Timed out waiting for DP idle patterns [466020.683543] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466020.683579] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466020.688427] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466020.689938] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466021.373912] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [466021.373931] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466021.392940] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466021.394493] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466022.078572] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [466022.078589] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466022.097630] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466022.098894] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466022.702068] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [466022.702082] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466022.718745] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466022.720332] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466023.404082] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [466023.404100] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466023.423108] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466023.423143] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466023.424681] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466024.108708] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [466024.108726] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466024.127766] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466024.129317] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466024.813277] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [466024.813295] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466024.832340] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466024.832374] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466024.833910] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466025.517970] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too many voltage retries, give up [466025.517988] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466025.518505] [drm:intel_dp_link_training_channel_equalization [i915]] *ERROR* failed to train DP, aborting [466025.518519] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466025.520651] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466025.522734] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [466025.522772] [drm:intel_dp_link_training_channel_equalization [i915]] *ERROR* Timed out waiting for DP idle patterns [466025.522790] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt Expected results: Monitor recognized and used. Additional info: Rebooting into 4.3.5-300.fc23.x86_64 works around the problem.
I don't know whether it matters whether I boot docked. Every time this happened, the system has been in the dock when I booted. I don't yet know what happens if I boot undocked and then dock. If that is important to diagnosing the problem, I can experiment.
I just experienced a similar symptom with 4.3.3-303.fc23.x86_64 after many successful undock/dock cycles: [388642.070874] thinkpad_acpi: docked into hotplug port replicator [388642.158475] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [388642.158502] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [388642.160052] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [388642.844876] [drm:intel_dp_start_link_train [i915]] *ERROR* too many voltage retries, give up With 4.4 kernels, it seems never to work; with 4.3, I've seen one instance of failure now, though once it fails it seems to be a permanent case. A sleep/wakeup cycle does not sufficiently reset it to work again.
I am currently running 4.4.8-300.fc23.x86_64 and it is not exhibiting the problem. I booted docked and have since had several cycles of docking and undocking, as well as software-initiated and lid-close-initiated suspend: $ dmesg | grep 'ThinkPad Dock' [ 1.717658] usb 4-5: Product: Lenovo ThinkPad Dock [ 1.919875] usb 3-9: Product: Lenovo ThinkPad Dock [ 2.407340] usb 3-9.4: Product: Lenovo ThinkPad Dock [ 3049.452626] usb 3-9: Product: Lenovo ThinkPad Dock [ 3049.822189] usb 3-9.4: Product: Lenovo ThinkPad Dock [ 7298.907517] usb 4-5: Product: Lenovo ThinkPad Dock [52911.311570] usb 4-5: Product: Lenovo ThinkPad Dock [52911.605273] usb 3-9: Product: Lenovo ThinkPad Dock [52911.976259] usb 3-9.4: Product: Lenovo ThinkPad Dock Since 4.3 has since failed occasionally with this pattern and now a newer 4.4 is at least in one case not reproduced the problem, I can't call it reliably reproducible any more. I also updated the entire system since the problem started, so the improvement with the new kernel could be due to other updates.
However, it hasn't been fixed either, since it just recurred after one more suspend-resume cycle from that same instance of 4.4.8-300.fc23.x86_64 I'll reboot it undocked now.
4.4.8-300.fc23.x86_64 reproduced the problem after quite a few cycles over eight days of uptime, initially booted undocked, and six docking events.
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