Public bug reported:
Without any clear correlation to events, the VGA output of my NUC5i3RYH
goes to sleep, while the other output (HDMI) has no problem.
The running system is Ubuntu MATE 16.04 amd64 with kernel
4.4.0-21.37-generic 4.4.6
The NUC5i3RYH has an onboard HD Intel 5500.
It does NOT happen in 14.04 nor in 15.10.
The monitor can be waken up again with xrandr with this script:
### Switch off DP1 = VGA
xrandr --output HDMI1 --mode 1280x1024 --output DP1 --off
sleep 1
### Turns it on again
xrandr --output HDMI1 --mode 1280x1024 --output DP1 --mode 1280x1024 --auto
--right-of HDMI1 --primary
The only info I found is in kern.log:
[80299.466886] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun
No info in Xorg.log
Will someone please help?
Thanks.
Marco
The relevant part of lspci about the GPU is:
00:02.0 VGA compatible controller [0300]: Intel Corporation Broadwell-U
Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Intel Corporation Broadwell-U Integrated Graphics [8086:2057]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 45
Region 0: Memory at a9000000 (64-bit, non-prefetchable) [size=16M]
Region 2: Memory at b0000000 (64-bit, prefetchable) [size=256M]
Region 4: I/O ports at 2000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Address: fee00018 Data: 0000
Capabilities: [d0] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [a4] PCI Advanced Features
AFCap: TP+ FLR+
AFCtrl: FLR-
AFStatus: TP-
Kernel driver in use: i915
Kernel modules: i915
I've tried to report the bug in the i915 package but the launchpad
reports <<"i915" does not exist in Ubuntu. Please choose a different
package. If you're unsure, please select "I don't know">>.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1573120
Title:
VGA monitor goes to sleep randomly in 16.04
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