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[vince lewis <vince.lewis1968@xxxxxxxxx>]

I have the same issue.

At the login screen, I select my user, enter the password, the mouse works fine at this point.
Click on login, wait, screen comes up.... then at random, the mouse either works fine (about 1 time in 5) or it goes really really slow (4 times out of 5).

Only way I'm working around it is to reboot (usually 5 times ish) till
it decides to work.

As a test manager by trade I would say this is a P3 at least not a P4,
as it's definitely a functional issue not cosmetic, albeit with an
untidy workaround (many reboots).

I'm running 4.15.0-52-lowlatency #56-Ubuntu SMP PREEMPT Tue Jun 4
23:39:39 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

I'll post contents of lshw and lspci, let me know if you need more.

** Attachment added: "lshw_and_lspci.txt"
   https://bugs.launchpad.net/ubuntustudio/+bug/1787857/+attachment/5272856/+files/lshw_and_lspci.txt

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https://bugs.launchpad.net/bugs/1787857

Title:
  USB mouse cursor lags after random time of correct behaviour

Status in Ubuntu Studio:
  Incomplete
Status in linux package in Ubuntu:
  Confirmed
Status in rtirq package in Ubuntu:
  Confirmed

Bug description:
  I installed Ubuntu Studio 18.04.1 LTS. After the first apt-get update I noticed the following behaviour:
  after havig logged in, my USB mouse works normally for about ten seconds, then the cursor starts lagging a lot which makes the mouse pretty much unusable.
  The last dmesg always contain lines these: (more in attached file)

  [<000000009e659b0c>] irq_default_primary_handler threaded [<00000000fa56edac>] usb_hcd_irq
  [<000000009e659b0c>] irq_default_primary_handler threaded [<00000000fe1afb05>] _rtl_pci_interrupt [rtl_pci]
  Disabling IRQ #18

  Out of frustration & curiosity I disabled most autostart apps
  (Settings > Session ... > Autostart) and re-enabled them after
  rebooting. Since then I rarely encounter the lagging cursor. If I open
  Settings > Mouse & Touchpad and toggle any option on/off the cursor
  starts lagging.

  How can make the cursor work reliably?
  Some comment in dmesg mentions "irqpoll" boot option

  Ubuntu Studio 18.04.1
  4.15.0-20-lowlatency #21-Ubuntu SMP PREEMPT

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