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-b...@kde.org
Reporter: leightn2...@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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