linux-kernel - Re: 2.6.25-rc7: Ugh.

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Message-ID: <47EDBE77.2040908@rtr.ca>
Date:	Fri, 28 Mar 2008 23:58:47 -0400
From:	Mark Lord <lkml@....ca>
To:	linux-kernel@...r.kernel.org
Cc:	David Miller <davem@...emloft.net>, jkosina@...e.cz,
	gregkh@...e.de, linux-usb@...r.kernel.org, pavel@...e.cz,
	akpm@...ux-foundation.org, rtc-linux@...glegroups.com
Subject: Re: 2.6.25-rc7: Ugh.

Mark Lord wrote:
> Mark Lord wrote:
>> Mark Lord wrote:
>>>
>>> When I rebuilt with all debug stuff on, the kernel was worse than
>>> before, and just gave the "black screen of nothing" on resume,
>>> with a hung system.
>>>
>>> At least before the system didn't hang.
>>>
>>> Now I've just booted with a differently configured kernel,
>>> with only about half of the debug flags turned on.
>>> This one resumes from suspend, and *with* working USB too.
>>>
>>> Ugh. Gotta love it when the bug is so subtle that turning on
>>> the debug flags makes it (1) get worse, and/or (2) get cured.
>>>
>>> Here's the abbreviated diff between broken (no USB on resume, no hang),
>>> and working (good USB, no hang) .config files.
>> ..
>>> -CONFIG_RTC_CLASS=y
>>> +# CONFIG_RTC_CLASS is not set
>>
>> Mmm.. also had the RTC conflict resolved in that one.
>> Time to try another kernel with just the RTC change now.
> ..
> 
> Okay, that might be it.  I've booted and am running without debug flags again.
..

An update:  still mostly stable now.
But I have seen one resume failure on this machine since then,
and that's not "normal" -- suspend/resume are normally rock solid.

My other pure Intel Dell X1 notebook has also hung a couple
of time during startup -- usually with "switched to high resolution"
messages near-last on the the screen.  There's a long standing bug
to do with that stuff, which I first reported back in 2.6.20 (or .21).
Back then, it was kernel .config dependent, and has never been tracked down.

Maybe the same thing here, maybe not.

Cheers
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