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Date: Tue, 11 Aug 2009 12:52:02 +0200 (CEST)
From: Jan Engelhardt <jengelh@medozas.de>
To: Thomas Gleixner <tglx@linutronix.de>
cc: Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>,
       LKML <linux-kernel@vger.kernel.org>,
       rt-users <linux-rt-users@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
       Steven Rostedt <rostedt@goodmis.org>,
       Peter Zijlstra <peterz@infradead.org>, Carsten Emde <ce@ceag.ch>,
       Clark Williams <williams@redhat.com>, Fra@jasper.es
Subject: Re: [ANNOUNCE] 2.6.29.6-rt23
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On Friday 2009-07-10 20:29, Thomas Gleixner wrote:
>On Fri, 10 Jul 2009, Fernando Lopez-Lezcano wrote:
>> On Thu, 2009-07-09 at 20:25 +0200, Thomas Gleixner wrote:
>> 
>> I'm getting slightly weird behavior from rt23 in an intel quad core
>> machine (my T61 laptop is fine), rt22 was fine. It is some timer issue,
>> if I type continuously I get (every few seconds) repeated keys. Nothing
>> in the logs, nothing in dmesg that is (significantly) different from an
>> rt22 boot. 

I am getting the same issue, reliably reproducibly - though ironically
only with the proprietary NVIDIA. Key repeats, screen going "No signal"
for a sec, sometimes comes back, sometimes hangs the whole machine.

nv is fine, as is tty1 with or without NVIDIA.

>Hmm. The only change which touches timer related stuff is the ktime*
>speedups. Can you please apply the revert patch below and check
>whether that changes anything? If not, then we need to look at the
>2.6.29.5 -> .6 delta.
>
>diff --git b/kernel/time/timekeeping.c a/kernel/time/timekeeping.c
>index 4c99c98..3192dd0 100644
>--- b/kernel/time/timekeeping.c
>+++ a/kernel/time/timekeeping.c

This 2nd part (timekeeping.c) of your patch unfortunately does not
apply on -rt23, but I have edited it manually to get a result.

Works ok so far.

(BTW, CONFIG_GENERIC_TIME=y).