Input events lost randomly

Support
1

Hi,

Since the latest update, my mouse keeps randomly freezing every now and then, especially when a new application is launched. It lasts about 2 seconds, and then it runs fine again. I’m on KDE, and my Xorg log shows something like the following whenever such a freeze occurs:

Information [ 1587.474] (II) event29 - Logitech G502 HERO Gaming Mouse: SYN_DROPPED event - some input events have been lost.

It says that like 10 times or so. This mouse worked fine before the update.

System information:

Operating System: Manjaro Linux 
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.10
Kernel Version: 6.5.3-1-MANJARO (64-bit)
Graphics Platform: X11
Processors: 32 × AMD Ryzen 9 7950X 16-Core Processor
Memory: 30.5 GiB of RAM
Graphics Processor: AMD Radeon RX 6800
Product Name: X670E PG Lightning

The kernel version has not changed since the update, I kept it the same as before, so that’s probably not it.

Any ideas? Thanks!

2

inxi -Gx
ls /etc/X11/xorg.conf.d/

3 
Graphics:
  Device-1: AMD Navi 21 [Radeon RX 6800/6800 XT / 6900 XT]
    vendor: Tul / PowerColor driver: amdgpu v: kernel arch: RDNA-2
    bus-ID: 03:00.0
  Device-2: AMD Raphael driver: amdgpu v: kernel arch: RDNA-2
    bus-ID: 1a:00.0 temp: 44.0 C
  Display: x11 server: X.Org v: 21.1.8 driver: X: loaded: amdgpu
    unloaded: modesetting,radeon dri: radeonsi gpu: amdgpu resolution: 3840x2160
  API: OpenGL v: 4.6 Mesa 23.1.7-1 renderer: AMD Radeon RX 6800 (navi21
    LLVM 16.0.6 DRM 3.54 6.5.3-1-MANJARO) direct-render: Yes

00-keyboard.conf  30-touchpad.conf
4

Could be amdgpu cursor corruption problem.

Create /etc/X11/xorg.conf.d/20-amdgpu.conf and paste

Section "OutputClass"
     Identifier "AMD"
     MatchDriver "amdgpu"
     Driver "amdgpu"
     Option "SWCursor" "True"
EndSection

Reboot and check if the problem is still there

5

Thanks for the suggestion. I tried it and haven’t noticed any hang-ups so far, so it might have worked. It happened somewhat randomly before, so I will test it for a bit longer to be sure. I did notice that my mouse flickers a little bit sometimes now though, but that’s not a big deal.

6

Unfortunately, it still does it. I am no longer certain whether it’s the mouse, the keyboard, or the graphics driver - I had it hang earlier but the Konsole instance was still updating properly (it was running a process that printed a bunch), but just now had it hang for a bit when switching tabs, so it could be graphics driver related after all.

7

By the way, why do you use X11 while having AMD gpu?
May be switching to Wayland could help.

8

I wouldn’t recommend Wayland to any KDE Plasma 5 user regardless of GPU. There are numerous known issues, many of which will only get fixed in Plasma 6.

9

I have indeed not noticed any freezes on Wayland so far, although X11 was working fine before the latest Manjaro update and hitches randomly now still.