[Bug 111480] New: i915 monitor connected through dock not working
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Sat Aug 24 13:35:29 UTC 2019
https://bugs.freedesktop.org/show_bug.cgi?id=111480
Bug ID: 111480
Summary: i915 monitor connected through dock not working
Product: DRI
Version: unspecified
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: not set
Component: DRM/Intel
Assignee: intel-gfx-bugs at lists.freedesktop.org
Reporter: joseph-thommes at gmx.de
QA Contact: intel-gfx-bugs at lists.freedesktop.org
CC: intel-gfx-bugs at lists.freedesktop.org
Created attachment 145148
--> https://bugs.freedesktop.org/attachment.cgi?id=145148&action=edit
dmesg connecting dock with monitor and activating it
Bug description:
Monitor connected through HDMI or DP in lenovo-thunderbolt dock causes
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun
and after some time
[drm:intel_dp_start_link_train [i915]] *ERROR* Timed out waiting for DP idle
patterns
if enabled in xserver. Just connecting and not using it doesn't do anything.
The monitor shows up as a DP-Monitor even if it is connected through HDMI.
Also my input becomes extremely laggy, windows do not respond and my fan spins
up (not sure if this is related). I do not get any output on the screen, but
resolution etc are determined correctly when checking in xrandr.
After unplugging the monitor, everything is back to normal.
The monitor works with other computers.
All available firmware updates (dock and laptop) have been installed.
System environment:
-- chipset: not sure how to determine
-- system architecture: 64-bit
-- xf86-video-intel: 1:2.99.917+870+g6f4972d5-1
-- xserver: 1.20.5-2
-- mesa: 19.1.4-1
-- libdrm: 2.4.99-1
-- kernel: 5.2.9-arch1-1-ARCH
-- Linux distribution: arch
-- Machine or mobo model: Lenovo Thinkpad T490 (20N2), Ultra Docking Station
Type 40AJ
-- Display connector: HDMI/DP through dock
Reproducing steps:
Power up the laptop and login.
Connect the dock with a Monitor plugged in. (HDMI)
Activate the second screen (with arandr).
Alternative:
Boot with dock and monitor connected and start an X session.
Additional info:
None
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