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[Lassi <lassi.vaatamoinen@xxxxxxxxx>]

I just saw this right at boot. The mouse was lagging already at the
login screen. And the login screen took around 10 seconds to show up
after the first two lines of kernel boot messages. (Usually takes around
2 seconds).


** Attachment added: "dmesg_mouse_lag_ubuntustudio_login_screen.txt"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1787857/+attachment/5277099/+files/dmesg_mouse_lag_ubuntustudio_login_screen.txt

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

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

Status in linux package in Ubuntu:
  Incomplete
Status in rtirq package in Ubuntu:
  Invalid

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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