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? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1787857/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
