My USB mouse still doesn't work properly. At some point during the merge
window it was worse - then it wouldn't work at all. Now, the pointer
moves jerkily.

I get the following dmesg output:

[   15.753367] irq 16: nobody cared (try booting with the "irqpoll" option)
[   15.753427]  <IRQ>  [<ffffffff8108b2af>] ? __report_bad_irq+0x2f/0xd0
[   15.753444]  [<ffffffff81352ca9>] ? _raw_spin_unlock_irqrestore+0x9/0x40
[   15.753448]  [<ffffffff8108910e>] ? handle_irq_event_percpu+0x7e/0x140
[   15.753452]  [<ffffffff81089211>] ? handle_irq_event+0x41/0x70
[   15.753455]  [<ffffffff8108c244>] ? handle_fasteoi_irq+0x54/0xf0
[   15.753460]  [<ffffffff810042b5>] ? handle_irq+0x15/0x20
[   15.753463]  [<ffffffff81003f82>] ? do_IRQ+0x52/0xd0
[   15.753472]  [<ffffffff81352ca9>] ? _raw_spin_unlock_irqrestore+0x9/0x40
[   15.753482]  [<ffffffff8103ab76>] ? __do_softirq+0xc6/0x190
[   15.753499]  [<ffffffff81354f0c>] ? call_softirq+0x1c/0x30
[   15.753503]  [<ffffffff8100430d>] ? do_softirq+0x4d/0x80
[   15.753506]  [<ffffffff8103ad6e>] ? irq_exit+0x8e/0xb0
[   15.753620] [<ffffffffa01a3390>] usb_hcd_irq [usbcore]
[   15.753658] Disabling IRQ #16

Booting with irqpoll makes the mouse responsive again.

Attached: .config and full dmesg output.
-- 
Hilsen Harald