On 18 September 2011 06:47, Tim Connors <tconnors@rather.puzzling.org> wrote:
On Wed, 14 Sep 2011, Daniel Stone wrote:
On 14/09/2011, at 3:38 AM, Tim Connors <tconnors@rather.puzzling.org> wrote: Does running evtest on the keyboard device (which you can find through /var/log/Xorg.0.log or /proc/bus/input/devices) show the same lag? If so - definitely a kernel issue.
Yep - pauses with evtest too. But again, only in X, not at the console.
It also drops entire keystrokes instead of just lagging, at times.
Alright, that is indeed very much a kernel issue. It could be exacerbated by X; e.g. your GPU driver could be wedging for long enough that you miss a few interrupts -- something I have seen with nouveau previously. Try looking in dmesg for anything suspicious, or failing that, try the perf 'long IRQ handler' trace. Cheers, Daniel