I've set up KDE within Arch Linux (NOT Antergos) to lock at 5 min, screen to go off at 10 and system to suspend at 30. I've had intermittent (works for ages, then reverts) issues with the screen staying permanently on. Currently not working, nothing changed (except full pacman/yaourt updates).

I'd appreciate any pointers to help trace the fault/solution. I've gathered as much info as I've gone thru below, pls let me know if I can pull any other useful information. NOTE: I have tried posting this on the Arch forums, but one moderator seems to not like me and keeps closing my posts for no (real) reason. Hope you can help.

I'm using a Zotac Nvidia as my primary GPU:

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    lspci -k | grep -A 2 -E "(VGA|3D)"

    00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06)
        Subsystem: Gigabyte Technology Co., Ltd Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller
        Kernel modules: i915
--
    01:00.0 VGA compatible controller: NVIDIA Corporation GP106 [GeForce GTX 1060 3GB] (rev a1)
        Subsystem: ZOTAC International (MCO) Ltd. GP106 [GeForce GTX 1060 3GB]
        Kernel driver in use: nvidia

I can't see anything obvious in dmesg for acpi:

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    dmesg | grep acpi
    [    0.000000] ACPI: LAPIC_NMI (acpi_id[0xff] high edge lint[0x1])
    [    0.125024] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
    [    0.137190] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]
    [    0.137345] acpi PNP0A08:00: _OSC: platform does not support [PCIeHotplug PME]
    [    0.137432] acpi PNP0A08:00: _OSC: OS now controls [AER PCIeCapability]
    [    0.137433] acpi PNP0A08:00: FADT indicates ASPM is unsupported, using BIOS configuration
    [    0.183174] clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns

Nvidia messages in dmesg:

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    dmesg | grep nvidia
    [    2.519488] nvidia: module license 'NVIDIA' taints kernel.
    [    2.579092] nvidia-nvlink: Nvlink Core is being initialized, major device number 240
    [    2.579292] nvidia 0000:01:00.0: enabling device (0000 -> 0003)
    [    2.579372] nvidia 0000:01:00.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=none:owns=none
    [    2.595379] nvidia-modeset: Loading NVIDIA Kernel Mode Setting Driver for UNIX platforms  390.25  Wed Jan 24 19:29:37 PST 2018
    [    2.602069] [drm] [nvidia-drm] [GPU ID 0x00000100] Loading driver
    [    2.602071] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:01:00.0 on minor 0
    [    3.333123] caller _nv029921rm+0x57/0x90 [nvidia] mapping multiple BARs
    [    3.646595] nvidia-modeset: Allocated GPU:0 (GPU-860de92e-bb3d-dcb6-c1fb-a560ae02ece8) @ PCI:0000:01:00.0
    [13647.471431] chrome[1411]: segfault at 4 ip 00007f3dae78ede7 sp 00007ffd7970ff68 error 6 in libnvidia-glcore.so.390.25[7f3dad56c000+141e000]


It has been suggested I use DKMS modules:

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    pacman -Qs dkms
    local/dkms 2.5-1
        Dynamic Kernel Modules System
    local/nvidia-dkms 390.25-11
        NVIDIA driver sources for linux
    local/rtl8821au-dkms-git 5.1.5.r63.g06d399c-1
        rtl8821AU, rtl8812AU and rtl8811AU chipset driver with firmware v5.1.5
    local/virtualbox-host-dkms 5.2.6-2
        VirtualBox Host kernel modules sources

These are my NVidia drivers:

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    pacman -Qs nvidia
    local/lib32-nvidia-utils 390.25-1
        NVIDIA drivers utilities (32-bit)
    local/libvdpau 1.1.1+3+ga21bf7a-1
        Nvidia VDPAU library
    local/libxnvctrl 390.25-1
        NVIDIA NV-CONTROL X extension
    local/nvidia-dkms 390.25-11
        NVIDIA driver sources for linux
    local/nvidia-lts 1:390.25-2
        NVIDIA drivers for linux-lts
    local/nvidia-settings 390.25-1
        Tool for configuring the NVIDIA graphics driver
    local/nvidia-utils 390.25-2
        NVIDIA drivers utilities
    local/xf86-video-nouveau 1.0.15-2 (xorg-drivers)
        Open Source 2D acceleration driver for nVidia cards