Updating xorg-server from 1.20.13-2 to 1.20.13-3 breaks compositor in KDE plasma
System: Kernel: 5.10.61-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0 Desktop: KDE Plasma 5.22.5 tk: Qt 5.15.2
wm: kwin_x11 vt: 1 dm: SDDM Distro: Manjaro Linux base: Arch Linux
Machine: Type: Laptop System: LENOVO product: 20HF0000MZ v: ThinkPad T470s serial: <filter> Chassis: type: 10
serial: <filter>
Mobo: LENOVO model: 20HF0000MZ v: SDK0J40697 WIN serial: <filter> UEFI: LENOVO v: N1WET56W (1.35 ) date: 08/30/2019
CPU: Info: Dual Core model: Intel Core i5-7200U bits: 64 type: MT MCP arch: Amber/Kaby Lake note: check rev: 9 cache:
L2: 3 MiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 bogomips: 21607
Speed: 700 MHz min/max: 400/3100 MHz Core speeds (MHz): 1: 700 2: 700 3: 700 4: 700
Graphics: Device-1: Intel HD Graphics 620 vendor: Lenovo driver: i915 v: kernel bus-ID: 00:02.0 chip-ID: 8086:5916
class-ID: 0300
Device-2: Chicony Integrated Camera type: USB driver: uvcvideo bus-ID: 1-8:4 chip-ID: 04f2:b5ab class-ID: 0e02
Display: x11 server: X.Org 1.20.13 compositor: kwin_x11 driver: loaded: intel unloaded: modesetting
alternate: fbdev,vesa resolution: 1: 1920x1080~60Hz 2: 3840x2160~60Hz s-dpi: 96
OpenGL: renderer: Mesa Intel HD Graphics 620 (KBL GT2) v: 4.6 Mesa 21.2.1 direct render: Yes
I am using Manjaro Linux with KDE plasma. After the last system upgrade I was not longer able to use the compositor in plasma. The desktop was very laggy and the system load was very high. This only happens when the external display is attached.
The issue is due to xorg-server which I confirmed by manually downgrading the package to 1.20.13-2 from 1.20.13-3 (for xorg-server and xorg-server-common). With the version 1.20.13-2 everythings works as expected.