My pc slows down frequently and I always force restart. And I looked at the log for the crash. Is there a solution? Should I be worried?

Here is the output of journalctl -xe -p3 -b-1.

-- Logs begin at Sat 2019-07-06 16:43:28 IST, end at Mon 2019-08-12 21:40:53 IST. --
Aug 12 17:00:16 nirvash-pc kernel: DMAR: Failed to find handle for ACPI object \_SB.PCI0.SDMA
Aug 12 17:00:16 nirvash-pc kernel: DMAR: Failed to find handle for ACPI object \_SB.PCI0.SDHC
Aug 12 17:00:16 nirvash-pc kernel: scsi 4:0:0:1: Wrong diagnostic page; asked for 1 got 8
Aug 12 17:00:16 nirvash-pc kernel: scsi 4:0:0:1: Failed to get diagnostic page 0x1
Aug 12 17:00:16 nirvash-pc kernel: scsi 4:0:0:1: Failed to bind enclosure -19
Aug 12 17:00:16 nirvash-pc kernel: sd 4:0:0:0: [sdb] No Caching mode page found
Aug 12 17:00:16 nirvash-pc kernel: sd 4:0:0:0: [sdb] Assuming drive cache: write through
Aug 12 17:00:19 nirvash-pc kernel: kvm: disabled by bios
Aug 12 17:00:19 nirvash-pc kernel: kvm: disabled by bios
Aug 12 17:00:19 nirvash-pc kernel: kvm: disabled by bios
Aug 12 17:00:20 nirvash-pc kernel: Bluetooth: hci0: unexpected event for opcode 0xfc2f
Aug 12 17:00:21 nirvash-pc kernel: uvcvideo: Failed to query (GET_INFO) UVC control 8 on unit 1: -32 (exp. 1).
Aug 12 17:02:19 nirvash-pc kwin_x11[914]: kwin_core: Compositing is not possible
Aug 12 17:02:25 nirvash-pc kget[982]: Couldn't start kuiserver from org.kde.kuiserver.service: QDBusError("org.freedesktop.DBus.Error.ServiceUnknown", "The name org.kd>
Aug 12 19:34:01 nirvash-pc kernel: uvcvideo: Failed to query (GET_DEF) UVC control 8 on unit 1: -32 (exp. 1).
Aug 12 20:40:43 nirvash-pc kwin_x11[914]: kwin_core: Compositing is not possible
Aug 12 20:50:07 nirvash-pc kwin_x11[914]: kwin_core: Compositing is not possible
Aug 12 20:54:53 nirvash-pc kwin_x11[914]: kwin_core: Compositing is not possible
Aug 12 20:59:26 nirvash-pc kwin_x11[914]: kwin_core: Compositing is not possible
Aug 12 20:59:42 nirvash-pc kwin_x11[914]: kwin_core: Compositing is not possible
Aug 12 21:02:05 nirvash-pc kwin_x11[914]: kwin_core: Compositing is not possible

Can someone explain what is all this?

Did you perform an update. Or was the problem always there?

My old hard disk corrupted so I got a new one. I installed manjaro after repairing my pc. I guess I updated once after install.

So if I'm not mistaken, your system is up to date? And the problem was always there after the install?

Can you post your specs?

[nirvash@nirvash-pc ~]$ inxi -Fxxxz
System:    Host: nirvash-pc Kernel: 4.19.56-1-MANJARO x86_64 bits: 64 compiler: gcc v: 9.1.0 Desktop: KDE Plasma 5.16.2 
           tk: Qt 5.12.4 wm: kwin_x11 dm: SDDM Distro: Manjaro Linux 
Machine:   Type: Laptop System: LENOVO product: 80E5 v: Lenovo G50-80 serial: <filter> Chassis: type: 10 v: Lenovo G50-80 
           serial: <filter> 
           Mobo: LENOVO model: Lenovo G50-80 v: 31900059 WIN serial: <filter> UEFI: LENOVO v: B0CN80WW date: 05/18/2015 
Battery:   ID-1: BAT0 charge: 22.2 Wh condition: 22.2/28.5 Wh (78%) volts: 16.2/14.4 model: Lenovo IdeaPad type: Unknown 
           serial: <filter> status: Full 
CPU:       Topology: Dual Core model: Intel Core i5-5200U bits: 64 type: MT MCP arch: Broadwell rev: 4 L2 cache: 3072 KiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 17566 
           Speed: 798 MHz min/max: 500/2700 MHz Core speeds (MHz): 1: 798 2: 798 3: 798 4: 798 
Graphics:  Device-1: Intel HD Graphics 5500 vendor: Lenovo driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:1616 
           Display: x11 server: X.Org 1.20.5 driver: intel unloaded: modesetting alternate: fbdev,vesa compositor: kwin_x11 
           resolution: 1366x768~60Hz 
           OpenGL: renderer: Mesa DRI Intel HD Graphics 5500 (Broadwell GT2) v: 4.5 Mesa 19.1.1 compat-v: 3.0 
           direct render: Yes 
Audio:     Device-1: Intel Broadwell-U Audio vendor: Lenovo driver: snd_hda_intel v: kernel bus ID: 00:03.0 chip ID: 8086:160c 
           Device-2: Intel Wildcat Point-LP High Definition Audio vendor: Lenovo driver: snd_hda_intel v: kernel 
           bus ID: 00:1b.0 chip ID: 8086:9ca0 
           Sound Server: ALSA v: k4.19.56-1-MANJARO 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Lenovo driver: r8168 v: 8.047.01-NAPI 
           port: 3000 bus ID: 02:00.0 chip ID: 10ec:8168 
           IF: enp2s0 state: down mac: <filter> 
           Device-2: Intel Wireless 3160 driver: iwlwifi v: kernel port: 3000 bus ID: 03:00.0 chip ID: 8086:08b4 
           IF: wlp3s0 state: up mac: <filter> 
Drives:    Local Storage: total: 1.82 TiB used: 1004.22 GiB (53.9%) 
           ID-1: /dev/sda vendor: Seagate model: ST1000LM048-2E7172 size: 931.51 GiB speed: 6.0 Gb/s rotation: 5400 rpm 
           serial: <filter> rev: SDM1 scheme: GPT 
           ID-2: /dev/sdc type: USB vendor: Western Digital model: WD My Passport 25E1 size: 931.48 GiB serial: <filter> 
           rev: 1021 scheme: GPT 
Partition: ID-1: / size: 28.71 GiB used: 9.64 GiB (33.6%) fs: ext4 dev: /dev/sda9 
           ID-2: /home size: 197.36 GiB used: 154.33 GiB (78.2%) fs: ext4 dev: /dev/sda10 
           ID-3: swap-1 size: 7.81 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sda8 
Sensors:   System Temperatures: cpu: 44.0 C mobo: N/A 
           Fan Speeds (RPM): N/A 
Info:      Processes: 185 Uptime: 44m Memory: 3.77 GiB used: 1.85 GiB (49.1%) Init: systemd v: 242 Compilers: gcc: 9.1.0 
           Shell: bash v: 5.0.7 running in: konsole inxi: 3.0.34 

I have use manjaro-kde before. All those times it used to freeze. There was always dmar error.

You should update the system first by

pacman -Syyu

This is related to the card reader, but I don't think this is the problem. When your system becomes unstable, do you notice this in the desktop effects? If this is the case you can try changing the settings of the compositor. (Enabled on start-up? The rendering backend - openGL version) etc.

Yes, generally everything becomes unresponsive. How do I change the settings for compositor?

System settings-hardware-display & monitor -> compositor...
You can see what the settings are and change them if necessary.

It could be the problem. :pray:

Yeah I got that. But What should I change? Should I change backend to xrender?

You could try that. Don't know if this will change much. Also enabled on startup?

So this what's being shown.

Did you change the backend to XRender? Seems like there is a problem with Kwin. Could indeed be a bug.

Now I did. But I don't know what difference it makes.

Will updating the system do anything?

I thought your system was up to date?

@Keruskerfuerst mentioned it above -> pacman -Syyu

I did an update in june when I freshly installed it.

June ??? Ok back to the terminal :rofl:
-> pacman -Syyu

Perform the update in TTY2 (ctrl-alt-F2)

If this didn't help, there are 2 other options I can think off :slight_smile:

1: post your kwinrc file (.config directory)

2: there might be a problem with your webcam.

or 3 ... we need someone with a lot of brains. No just a few more than me :grin:

Updating right now.

Here's the kwinrc

[$Version]
update_info=kwin.upd:replace-scalein-with-scale,kwin.upd:port-minimizeanimation-effect-to-js,kwin.upd:port-scale-effect-to-js,kwin.upd:port-dimscreen-effect-to-js

[Compositing]
AnimationSpeed=3
Backend=XRender
Enabled=true
GLCore=false
GLPreferBufferSwap=a
GLTextureFilter=2
HiddenPreviews=5
OpenGLIsUnsafe=true
WindowsBlockCompositing=true
XRenderSmoothScale=false

[Desktops]
Id_1=db1a54ef-0461-4ea8-840f-3d96952b673b
Id_2=5737f8ed-5ae6-4ef2-9572-7757e4786825
Rows=2

[org.kde.kdecoration2]
library=org.kde.kwin.aurorae
theme=__aurorae__svg__KDE-Story

Whoa.

If the update didn't help, the only thing you can try is change

OpenGLIsUnsafe=true

to false. After that you could try turning openGL back on in the backend settings of the compositor. If the problem still remains, we have to search in a different direction. With different people I'm afraid, because I'm stuck here.

So I hope the update solves this.

Oh btw, the webcam thing was because of this :

kernel: uvcvideo: Failed to query