This issue affect lenovo t450s as well. As result when connected to docking
station with two monitors attached (vga and dvi) monitors are not recognized
and dmesg flooded with infamous error ([ 743.432704] [drm:gen8_irq_handler
[i915_bpo]] *ERROR* The master control interrupt lied (SDE)!). It doesn't crash
the computer but in some cases make displays unrecognizable when undock
|dock.
- device: lenovo t450s
- proc: i7-5600U
- OS: ubuntu 14.04.03
- kernel: 3.19.0-33-generic x86_64
- video:
*-display
description: VGA compatible controller
product: Broadwell-U Integrated Graphics
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915_bpo latency=0
resources: irq:45 memory:e0000000-e0ffffff
memory:d0000000-dfffffff ioport:3000(size=64)
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https://bugs.launchpad.net/bugs/1488719
Title:
dmesg shows "[drm:gen8_irq_handler [i915]] *ERROR* The master control
interrupt lied (SDE)!"
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