Ubuntu
linux package

  1. Bug #1727662
  2. Comment #32

Comment 32 for bug 1727662

Revision history for this message
penalvch (penalvch) wrote : Re: [Lenovo ThinkPad T450s] Issues after docking and locking: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

Alexander Kops:
>"1) It's a lenovo ThinkPad Ultra Dock Type 40A2 20V I didn't know docking stations had firmwares up until now. Is there a way to find out via Ubuntu? Otherwise I have to talk to my company helpdesk about it."

While I'm not sure how to check via Ubuntu, the path of least resistence may be to pop a Windows laptop on the dock if available, and confirm via https://support.lenovo.com/us/en/solutions/migr-4tpjf4

>"2) Ok, will report it there. Do I have to try with another kernel again? Since the /drm-intel-nightly/current/ I tried it with did not yield the same log outputs..."

As per Intel's instructions, they want to you to test drm-tip, and provide debugging information. However, you don't have to build it. Instead, pre-built builds are provided as a courtesy by Ubuntu maintainers via https://wiki.ubuntu.com/Kernel/MainlineBuilds

Also, don't worry about SSH/netconsole, as that is usually for when the logs aren't giving reasonable hints to root cause. The latest logs were much better.