[kde] [Bug 380277] New: intermittent screen blinking/flashing

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=380277

            Bug ID: 380277
           Summary: intermittent screen blinking/flashing
           Product: kde
           Version: unspecified
          Platform: Neon Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: leightn2000 at unseen.is
  Target Milestone: ---

I am experiencing intermittent screen blinking/flashing on my Dell Latitude
5480 laptop. 

I am running:
KDE neon 5.9 user edition
KDE Plasma: 5.9.5
Ubuntu: 16.04.2
Qt: 5.7.1

Problem:
The blinking (screen goes quickly black) occurs on the laptop screen. Blinking
occus even when there are no external monitors, and also occurs on any external
monitors when they are plugged in. On the external monitors, the blinking is
worse, such that the screen goes black for a second or two. Blinking on the
monitor and laptop screens is not synchronized, ie, the laptop screen will
blink quickly, and sometime later the external monitor will also blink, more
slowly. Repeats frequently so that the laptop is not usable. 

Solutions already tried:
Running these linux kernels: the ubuntu 16.04 default 4.8 kernel, the hwe
kernel, the hwe edge kernel (4.10), and the 4.12 rc2 kernel (ubuntu mainline). 
Changing the compositer settings (using system system settings gui, tried all
possible combs (xrender, opengl 2.0, opengl 3.1, trying full screen repaints
only, and disabling the compositer altogether). 
Installing the Intel graphics update tool, and updating all the graphics
packages. Installing firmware from intel: kbl_dmc_ver1_01, kbl_guc_ver9_14,
kbl_huc_ver02_00_1810


Hardware (from lshw):

H/W path           Device     Class          Description
========================================================
                              system         Latitude 5480 (07D0)
/0                            bus            0D0XXK
/0/0                          memory         64KiB BIOS
/0/45                         memory         16GiB System Memory
/0/45/0                       memory         16GiB SODIMM Synchronous 2400 MHz
(0.4 ns)
/0/45/1                       memory         DIMM [empty]
/0/4b                         memory         256KiB L1 cache
/0/4c                         memory         1MiB L2 cache
/0/4d                         memory         8MiB L3 cache
/0/4e                         processor      Intel(R) Core(TM) i7-7820HQ CPU @
2.90GHz
/0/100                        bridge         Intel Corporation
/0/100/2                      display        Intel Corporation
/0/100/4                      generic        Intel Corporation
/0/100/14                     bus            Sunrise Point-H USB 3.0 xHCI
Controller
/0/100/14/0        usb1       bus            xHCI Host Controller
/0/100/14/0/3                 bus            USB 2.0 Hub
/0/100/14/0/3/1               bus            USB 2.0 Hub
/0/100/14/0/3/1/3             input          USB Optical Mouse
/0/100/14/0/3/1/4             input          Natural
/0/100/14/0/6                 communication  Bluetooth wireless interface
/0/100/14/0/b                 multimedia     Integrated_Webcam_HD
/0/100/14/1        usb2       bus            xHCI Host Controller
/0/100/14.2                   generic        Sunrise Point-H Thermal subsystem
/0/100/15                     generic        Sunrise Point-H LPSS I2C
Controller #0
/0/100/15.1                   generic        Sunrise Point-H LPSS I2C
Controller #1
/0/100/17                     storage        Sunrise Point-H SATA controller
[AHCI mode]
/0/100/1c                     bridge         Sunrise Point-H PCI Express Root
Port #2
/0/100/1c/0        wlp1s0     network        Intel Corporation
/0/100/1c.2                   bridge         Sunrise Point-H PCI Express Root
Port #3
/0/100/1c.2/0                 generic        Realtek Semiconductor Co., Ltd.
/0/100/1c.4                   bridge         Sunrise Point-H PCI Express Root
Port #5
/0/100/1d                     bridge         Sunrise Point-H PCI Express Root
Port #9
/0/100/1d/0                   storage        Non-Volatile memory controller
/0/100/1f                     bridge         Sunrise Point-H LPC Controller
/0/100/1f.2                   memory         Memory controller
/0/100/1f.3                   multimedia     Intel Corporation
/0/100/1f.4                   bus            Sunrise Point-H SMBus
/0/100/1f.6        enp0s31f6  network        Ethernet Connection (5) I219-LM
/1                            power          DELL GD1JP65

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