Turn on the laptop whit/whitout VGA external conected, connected and
then wait to blank screen or simple close your laptop.
I get a blank screen and the follow log:
Jun 19 07:01:03 oemunoz kernel: [ 753.076621]
[drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo
underrun on pch transcoder A
Jun 19 07:01:03 oemunoz kernel: [ 753.076638]
[drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO
underrun
Jun 19 07:01:03 oemunoz kernel: [ 753.082360]
[drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo
underrun on pipe B
Jun 19 07:01:03 oemunoz kernel: [ 753.082376]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun
My setup:
product: 20AWS0JV0A (LENOVO_MT_20AW_BU_Think_FM_ThinkPad T440p)
vendor: LENOVO
version: ThinkPad T440p
00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Gen Core
Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA
controller])
Subsystem: Lenovo ThinkPad T440p [17aa:220e]
Flags: bus master, fast devsel, latency 0, IRQ 29
Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 3000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
Kernel modules: i915
Linux oemunoz 4.4.0-79-generic #100-Ubuntu SMP Wed May 17 19:58:14 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux
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https://bugs.launchpad.net/bugs/1568865
Title:
[drm:intel_cpu_fifo_underrun_irq_handler [i915_bpo]] *ERROR* CPU pipe
B FIFO underrun
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