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[Lassi <lassi.vaatamoinen@xxxxxxxxx>]

I tried now with 'linux-generic' package (provides currently linux-
image-5.0.0-20-generic). I did not  experience any mouse lag issues,
upon any successful* boot. So in that sense this is 0/10 reproducible
with 'generic' kernel variant.

With 'lowlatency' kernel the mouse lag issue is roughly 5/10.


*) NOTE: with 'generic'-kernel I saw i2c-2 device NAK errors at startup boot messages, and sometimes the boot froze at that point. I checked with the 'i2cdetect' tool and the listing for device 2 showed "nvkm". Howwever, I saw the i2c-2 NAK errors during successful boots as well.

With 'lowlatency' kernel I did not see the i2c NAK-errors at all, but
the dmesg in mouse lag case shows "nvkm" in it...

So, could this be related to KMS somehow?

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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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