I fixed one of the issues I described above by reinstalling Ubuntu with a swap. Originally I installed it without a swap, with the rationale that this tiny laptop has only 32GB SSD, which is very little. I determined that vswapd was killing the CPU, that's why the mouse cursor was moving so slowly.
I reinstalled with full swap support. On top of that I installed zram- config and also reduced vm.swappiness to 10, which arguably seems more snappy. So far it works like a charm. If I have other similar problems, I will report them here. Note: I am still using intel_idle.cstate_max=1 in order to avoid random hangs. It would be nice if Intel got around to fixing this bug in their firmware... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1575467 Title: [Dell Inspiron 3451] WARNING: CPU: 1 PID: 1297 at /build/linux-lts- utopic-vy2yyy/linux-lts- utopic-3.16.0/drivers/gpu/drm/i915/intel_display.c:1743 vlv_wait_port_ready+0x126/0x170 [i915]() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1575467/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
