These message are being received "qt.qpa.input.events: scroll event from unregistered device"

SMF-Qt

I have an application using QTableView and QStandardItemModel the table view contains 3 columns and a number of rows, the application searches for missing .so files and recurses through a directory structure given a root directory as a starting point. The application itself is working as intended however if the the search goes on for a long time (many thousands of files to be looked at) the following message(s) start getting emitted:

qt.qpa.input.events: scroll event from unregistered device <?>

The results of the search are filtered before a new row is added so the table view typically may have only a few (10-20~) entries.

I have ran the application with valgind and nothing obvious is being reported.
I have also ran the application with strace and again nothing obvious is reported.

I am using Qt 6.5.2 and Qt 6.4.0 the ui is constucted using Qt designer.

Any ideas why this message is being generated ?
Thanks.

SMF-Qt

@SGaist

Ok, I have upgraded to Qt 6.6.3 and the problem has gone.

SGaist

Hi,

On which OS are you running your application ?

Are doing the file analysis in the main thread ?

SMF-Qt

Sorry for the delay in replying but other events have taken my time. So let me update this question with some additional background:

The the OS is now version 12.0 of LFS/BLFS , the current kernel is 6.6.14 I am using Qt version 6.5.2 in addition the application uses Qwt 6.3.0-dev. The only inputs to the application is a number QPushButtons, the application reads data from a MySql (Via Qt) database which is presented in a number of Qwt graphs.

The events appear at random times and come in blocks of about 12.

...
qt.qpa.input.events: scroll event from unregistered device a
qt.qpa.input.events: scroll event from unregistered device 8
qt.qpa.input.events: scroll event from unregistered device 9
qt.qpa.input.events: scroll event from unregistered device d
...

SMF-Qt

From the code base the following references have been found their relevance to me is a unknown:

./qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:Q_LOGGING_CATEGORY(lcQpaXInputEvents, "qt.qpa.input.events")
./qtbase/src/plugins/platforms/ios/quiview.mm:Q_LOGGING_CATEGORY(lcQpaInputEvents, "qt.qpa.input.events")
./qtbase/src/platformsupport/input/libinput/qlibinputtouch.cpp:Q_LOGGING_CATEGORY(qLcLibInputEvents, "qt.qpa.input.events")
./qtbase/src/platformsupport/input/evdevtouch/qevdevtouchhandler.cpp:Q_LOGGING_CATEGORY(qLcEvents, "qt.qpa.input.events")

SGaist

What devices do you have connected to your system ?

SMF-Qt

Hardware

The usual Hard drives a mixture of SSD and traditional.
Two bluray drives one a read/write the othe just read.

PCI:
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD9x0/RX980 Host Bridge (rev 02)
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD/ATI] RD890S/RD990 I/O Memory Management Unit (IOMMU)
00:02.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890/RD9x0/RX980 PCI to PCI bridge (PCI Express GFX port 0)
00:04.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890/RD9x0/RX980 PCI to PCI bridge (PCI Express GPP Port 0)
00:07.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890/RD9x0/RX980 PCI to PCI bridge (PCI Express GPP Port 3)
00:09.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RD890/RD9x0/RX980 PCI to PCI bridge (PCI Express GPP Port 4)
00:11.0 SATA controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 SATA Controller [AHCI mode] (rev 40)
00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:12.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:13.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:13.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 SMBus Controller (rev 42)
00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 Azalia (Intel HDA) (rev 40)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 LPC host controller (rev 40)
00:14.4 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 PCI to PCI Bridge (rev 40)
00:14.5 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI2 Controller
00:15.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] SB700/SB800/SB900 PCI to PCI bridge (PCIE port 0)
00:16.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:16.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h Processor Function 5
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X] (rev c7)
01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Baffin HDMI/DP Audio [Radeon RX 550 640SP / RX 560/560X]
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
03:00.0 USB controller: ASMedia Technology Inc. ASM1042 SuperSpeed USB Host Controller
04:00.0 Multimedia controller: Philips Semiconductors SAA7160 (rev 03)
05:05.0 RAID bus controller: Silicon Image, Inc. SiI 3114 [SATALink/SATARaid] Serial ATA Controller (rev 02)
06:00.0 Non-Volatile memory controller: Micron Technology Inc 2300 NVMe SSD [Santana]

USB:
Bus 003 Device 026: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 009 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 005: ID 0557:2213 ATEN International Co., Ltd CS682 2-Port USB 2.0 DVI KVM Switch
Bus 002 Device 004: ID 0557:8021 ATEN International Co., Ltd Hub
Bus 002 Device 062: ID 1c4f:0043 SiGma Micro USB Keyboard
Bus 002 Device 002: ID 0409:005a NEC Corp. HighSpeed Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 04a9:190f Canon, Inc. CanoScan LiDE 220
Bus 001 Device 002: ID 2109:0700 VIA Labs, Inc. VL700 SATA 3Gb/s bridge
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

SGaist

I meant what kind of input devices do you have connected.

SMF-Qt

Sorry, USB keyboard and mouse via a kvm switch nothing else.

SMF-Qt

OK, it looks like the events appear when I use the KVM switch.

SGaist

@SMF-Qt that's a but unexpected. Is your KVM advertised as something else than an input device ?

SMF-Qt

@SGaist

Each time I switch I get the following (2 from many events) from the kernal (dmesg). All my linux systems connected to the kvm report the same kernal activity only one of the systems reports the "qt.qpa.input.events".

[765315.192379] usb 2-3.1: new low-speed USB device number 81 using ehci-pci
[765315.291101] usb 2-3.1: New USB device found, idVendor=1c4f, idProduct=0043, bcdDevice= 1.07
[765315.291107] usb 2-3.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[765315.291109] usb 2-3.1: Product: USB Keyboard
[765315.291110] usb 2-3.1: Manufacturer: HA305-3
[765315.294194] input: HA305-3 USB Keyboard as /devices/pci0000:00/0000:00:13.2/usb2/2-3/2-3.1/2-3.1:1.0/0003:1C4F:0043.0189/input/input602
[765315.346830] hid-generic 0003:1C4F:0043.0189: input,hidraw4: USB HID v1.10 Keyboard [HA305-3 USB Keyboard] on usb-0000:00:13.2-3.1/input0
[765315.350009] input: HA305-3 USB Keyboard Consumer Control as /devices/pci0000:00/0000:00:13.2/usb2/2-3/2-3.1/2-3.1:1.1/0003:1C4F:0043.018A/input/input603
[765315.401626] input: HA305-3 USB Keyboard System Control as /devices/pci0000:00/0000:00:13.2/usb2/2-3/2-3.1/2-3.1:1.1/0003:1C4F:0043.018A/input/input604
[765315.401720] hid-generic 0003:1C4F:0043.018A: input,hidraw5: USB HID v1.10 Device [HA305-3 USB Keyboard] on usb-0000:00:13.2-3.1/input1
[765370.553505] usb 2-3.1: USB disconnect, device number 81

[769950.486280] usb 2-3.1: new low-speed USB device number 82 using ehci-pci
[769950.584701] usb 2-3.1: New USB device found, idVendor=1c4f, idProduct=0043, bcdDevice= 1.07
[769950.584708] usb 2-3.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[769950.584711] usb 2-3.1: Product: USB Keyboard
[769950.584713] usb 2-3.1: Manufacturer: HA305-3
[769950.587901] input: HA305-3 USB Keyboard as /devices/pci0000:00/0000:00:13.2/usb2/2-3/2-3.1/2-3.1:1.0/0003:1C4F:0043.018B/input/input605
[769950.639550] hid-generic 0003:1C4F:0043.018B: input,hidraw4: USB HID v1.10 Keyboard [HA305-3 USB Keyboard] on usb-0000:00:13.2-3.1/input0
[769950.642401] input: HA305-3 USB Keyboard Consumer Control as /devices/pci0000:00/0000:00:13.2/usb2/2-3/2-3.1/2-3.1:1.1/0003:1C4F:0043.018C/input/input606
[769950.694455] input: HA305-3 USB Keyboard System Control as /devices/pci0000:00/0000:00:13.2/usb2/2-3/2-3.1/2-3.1:1.1/0003:1C4F:0043.018C/input/input607
[769950.694579] hid-generic 0003:1C4F:0043.018C: input,hidraw5: USB HID v1.10 Device [HA305-3 USB Keyboard] on usb-0000:00:13.2-3.1/input1
[770393.889747] usb 2-3.1: USB disconnect, device number 82

In the Xorg.log I get a similar set of messages about the keyboard, here is an example (1 from many):

[ 17.107] (II) config/udev: Adding input device HA305-3 USB Keyboard (/dev/input/event2)
[ 17.107] () HA305-3 USB Keyboard: Applying InputClass "evdev keyboard catchall"
[ 17.107] () HA305-3 USB Keyboard: Applying InputClass "system-keyboard"
[ 17.107] () HA305-3 USB Keyboard: Applying InputClass "libinput keyboard catchall"
[ 17.107] (II) Using input driver 'libinput' for 'HA305-3 USB Keyboard'
[ 17.107] () HA305-3 USB Keyboard: always reports core events
[ 17.107] (II) event2 - HA305-3 USB Keyboard: is tagged by udev as: Keyboard
[ 17.107] (II) event2 - HA305-3 USB Keyboard: device is a keyboard
[ 17.108] (II) event2 - HA305-3 USB Keyboard: device removed
[ 17.117] (II) XINPUT: Adding extended input device "HA305-3 USB Keyboard" (type: KEYBOARD, id 8)
[ 17.118] (II) event2 - HA305-3 USB Keyboard: is tagged by udev as: Keyboard
[ 17.118] (II) event2 - HA305-3 USB Keyboard: device is a keyboard
[ 17.118] (II) config/udev: Adding input device HA305-3 USB Keyboard Consumer Control (/dev/input/event3)

The mouse only appears once in the kernel messages (the machine has been up 11days):

Mar 9 19:21:46 Andromeda kernel: [ 3.606392] hid-generic 0003:0557:2213.0004: input,hidraw3: USB HID v1.00 Mouse [ATEN USB KVMP w. OSD] on usb-0000:00:13.2-3.3.1/input1
Mar 9 19:21:46 Andromeda kernel: [ 3.646397] mousedev: PS/2 mouse device common for all mice

However the Xorg.log shows many events:

[ 16.914] (==) modeset(0): Silken mouse enabled
[ 17.127] (II) XINPUT: Adding extended input device "HA305-3 USB Keyboard Consumer Control" (type: MOUSE, id 9)
[ 17.153] (II) event6 - ATEN USB KVMP w. OSD: is tagged by udev as: Mouse
[ 17.167] (II) XINPUT: Adding extended input device "ATEN USB KVMP w. OSD" (type: MOUSE, id 12)
[ 17.168] (II) event6 - ATEN USB KVMP w. OSD: is tagged by udev as: Mouse
[ 17.168] (II) config/udev: Adding input device ATEN USB KVMP w. OSD (/dev/input/mouse0)
[ 2633.808] (II) XINPUT: Adding extended input device "HA305-3 USB Keyboard Consumer Control" (type: MOUSE, id 8)
[ 13971.242] (II) XINPUT: Adding extended input device "HA305-3 USB Keyboard Consumer Control" (type: MOUSE, id 10)
[ 18791.065] (II) XINPUT: Adding extended input device "HA305-3 USB Keyboard Consumer Control" (type: MOUSE, id 10)
[ 25194.517] (II) XINPUT: Adding extended input device "HA305-3 USB Keyboard Consumer Control" (type: MOUSE, id 9)
[ 31231.683] (II) XINPUT: Adding extended input device "HA305-3 USB Keyboard Consumer Control" (type: MOUSE, id 8)
[ 36563.679] (II) XINPUT: Adding extended input device "HA305-3 USB Keyboard Consumer Control" (type: MOUSE, id 9)
[ 46198.188] (II) XINPUT: Adding extended input device "HA305-3 USB Keyboard Consumer Control" (type: MOUSE, id 9)
[ 46834.540] (II) XINPUT: Adding extended input device "HA305-3 USB Keyboard Consumer Control" (type: MOUSE, id 10)
[ 47590.134] (II) XINPUT: Adding extended input device "HA305-3 USB Keyboard Consumer Control" (type: MOUSE, id 10)......

SMF-Qt

@SMF-Qt

The only references to the KVM in the system logs are:

Mar 9 19:21:53 Andromeda elogind-daemon[2092]: Watching system buttons on /dev/input/event5 (ATEN USB KVMP w. OSD)
Mar 9 19:21:46 Andromeda kernel: [ 3.528056] usb 2-3.3.1: Product: USB KVMP w. OSD
Mar 9 19:21:46 Andromeda kernel: [ 3.543647] input: ATEN USB KVMP w. OSD as /devices/pci0000:00/0000:00:13.2/usb2/2-3/2-3.3/2-3.3.1/2-3.3.1:1.0/0003:0557:2213.0003/input/input10
Mar 9 19:21:46 Andromeda kernel: [ 3.595774] hid-generic 0003:0557:2213.0003: input,hidraw2: USB HID v1.00 Keyboard [ATEN USB KVMP w. OSD] on usb-0000:00:13.2-3.3.1/input0
Mar 9 19:21:46 Andromeda kernel: [ 3.606155] input: ATEN USB KVMP w. OSD as /devices/pci0000:00/0000:00:13.2/usb2/2-3/2-3.3/2-3.3.1/2-3.3.1:1.1/0003:0557:2213.0004/input/input11
Mar 9 19:21:46 Andromeda kernel: [ 3.606392] hid-generic 0003:0557:2213.0004: input,hidraw3: USB HID v1.00 Mouse [ATEN USB KVMP w. OSD] on usb-0000:00:13.2-3.3.1/input1

SMF-Qt

@SMF-Qt

Just rebuilt the linux kernel to 6.6.22 and the Qt Ui they supply shows the same behaviour so that eliminates code that I have written.

SGaist

Looks like it is doing something funny with regard to input events.

SMF-Qt

@SGaist

Ok, I have upgraded to Qt 6.6.3 and the problem has gone.

SGaist

@SMF-Qt Nice ! Then we can consider this case solved :-)

SMF-Qt

@SGaist
Yes thank you.