Unable to move mouse and scroll at the same time on Linux

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Unable to move mouse and scroll at the same time on Linux

Postby lylemelende » 12. Sep 2021, 12:28

This only occurs when I am using Virtualbox's Integrated mouse mode in Linux virtual machines. When I am moving my mouse, scrolling does not work at all. My mouse must remain completely motionless until scrolling starts to work again.

There is a stackexchange post that investigates this issue in more detail, explaining that this is caused by having two different pointer input devices on the Linux machine, one from the Integrated mouse and another from Virtualbox's default mouse input. I can't post the link due to forum rules so here is the title of the stackexchange post: "Scrolling impossible while moving mouse - Fedora 28 VM guest on Win10".

I have tested this with xubuntu 20.10 and a fresh install of Linux Mint 20.2, both machines have the same issue.

My computer specs:

Virtualbox 6.1.26
Windows 10 64 bit
Intel i5-9400F
32GB Ram
GTX 750 Ti
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Re: Unable to move mouse and scroll at the same time on Linux

Postby mpack » 12. Sep 2021, 13:38

Please provide a VM log file. Make sure the VM is fully shut down, then right click it in the manager UI. Select "Show Log" and save "VBox.log" (no other file) to a zip file. Attach the zip here.
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Re: Unable to move mouse and scroll at the same time on Linux

Postby lylemelende » 12. Sep 2021, 14:33

Here is the log file:
Attachments
Mint-2021-09-12-13-30-24.zip
(35.82 KiB) Downloaded 3 times
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Re: Unable to move mouse and scroll at the same time on Linux

Postby lylemelende » 26. Sep 2021, 19:24

I did a bit of investigating, this is caused by having mouse move and scroll events being sent by different cursor input devices.

Using the following command:

Code: Select all   Expand viewCollapse view
xinput test-xi2 --root


I can see the following:

Code: Select all   Expand viewCollapse view
EVENT type 17 (RawMotion)
    device: 2 (9)
    detail: 0
    flags:
    valuators:
          0: 1704.97 (1704.97)
          1: 39323.40 (39323.40)

EVENT type 6 (Motion)
    device: 9 (9)
    detail: 0
    flags:
    root: 55.23/570.23
    event: 55.23/570.23
    buttons:
    modifiers: locked 0x10 latched 0 base 0 effective: 0x10
    group: locked 0 latched 0 base 0 effective: 0
    valuators:
        0: 1704.97
        1: 39323.40
    windows: root 0x532 event 0x532 child 0x4600003
EVENT type 17 (RawMotion)
    device: 2 (12)
    detail: 0
    flags:
    valuators:
          3: 15.00 (15.00)

EVENT type 6 (Motion)
    device: 12 (12)
    detail: 0
    flags:
    root: 55.23/571.23
    event: 55.23/571.23
    buttons:
    modifiers: locked 0x10 latched 0 base 0 effective: 0x10
    group: locked 0 latched 0 base 0 effective: 0
    valuators:
        3: -1470.00
    windows: root 0x532 event 0x532 child 0x4600003
EVENT type 15 (RawButtonPress)
    device: 2 (12)
    detail: 5
    flags: emulated
    valuators:

EVENT type 4 (ButtonPress)
    device: 12 (12)
    detail: 5
    flags: emulated
    root: 55.23/571.23
    event: 55.23/571.23
    buttons:
    modifiers: locked 0x10 latched 0 base 0 effective: 0x10
    group: locked 0 latched 0 base 0 effective: 0
    valuators:
    windows: root 0x532 event 0x532 child 0x4600003
EVENT type 16 (RawButtonRelease)
    device: 2 (12)
    detail: 5
    flags: emulated
    valuators:

EVENT type 5 (ButtonRelease)
    device: 12 (12)
    detail: 5
    flags: emulated
    root: 55.23/571.23
    event: 55.23/571.23
    buttons: 5
    modifiers: locked 0x10 latched 0 base 0 effective: 0x10
    group: locked 0 latched 0 base 0 effective: 0
    valuators:
    windows: root 0x532 event 0x532 child 0x4600003


Motion events are sent by device 9 (VirtualBox mouse integration), while scroll events are sent by device 12 (ImExPS/2 Generic Explorer Mouse).

Code: Select all   Expand viewCollapse view
$ xinput
⎡ Virtual core pointer                       id=2   [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                 id=4   [slave  pointer  (2)]
⎜   ↳ VirtualBox mouse integration               id=9   [slave  pointer  (2)]
⎜   ↳ VirtualBox USB Tablet                      id=10   [slave  pointer  (2)]
⎜   ↳ ImExPS/2 Generic Explorer Mouse            id=12   [slave  pointer  (2)]
⎣ Virtual core keyboard                      id=3   [master keyboard (2)]
    ↳ Virtual core XTEST keyboard                id=5   [slave  keyboard (3)]
    ↳ Power Button                               id=6   [slave  keyboard (3)]
    ↳ Sleep Button                               id=7   [slave  keyboard (3)]
    ↳ Video Bus                                  id=8   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard               id=11   [slave  keyboard (3)]
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Re: Unable to move mouse and scroll at the same time on Linux

Postby scottgus1 » 26. Sep 2021, 19:29

So the link for "Scrolling impossible while moving mouse - Fedora 28 VM guest on Win10" is https://unix.stackexchange.com/question ... t-on-win10, and the answer there links to viewtopic.php?f=3&t=79002&start=15, where the apparent "double mouse devices" appears to my Linux-noob eyes as being a Linux driver interpretation of Virtualbox's MI mouse, rather than Virtualbox actually providing two devices. The log shows what Virtualbox provides:

One instance of this at boot:
00:00:03.681271 VUSB: Attached 'HidMouse' to port 1 on RootHub#0 (FullSpeed)

One instance of this at shutdown:
00:02:04.734997 VUSB: Detached 'HidMouse' from port 1 on RootHub#0

So only one device is being inserted, which Linux is breaking into two devices. The Virtualbox post above contains suggested Linux manipulation way above my knowledge level, but it appears that there are some tweaks that can be made to Linux, or maybe changing the Virtualbox-provided device from PS/2 mouse to USB Tablet or vice versa.

Since the log records only one mouse inserted and one mouse removed, I cannot see so far that Virtualbox is making a mistake or has a bug.
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Re: Unable to move mouse and scroll at the same time on Linux

Postby scottgus1 » 26. Sep 2021, 19:31

If this by chance does come back to the Guest Additions mouse drivers being the problem, a post with logs and a link back to this topic on the Bugtracker would help the devs investigate.
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Re: Unable to move mouse and scroll at the same time on Linux

Postby arQon » 7. Oct 2021, 22:44

Isn't this just the generic "GTK3 is broken AF" problem?

try "GDK_CORE_DEVICE_EVENTS=1" in /etc/environment
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