linux-kernel - Re: [PATCH] dell-smm-hwmon: Cache fan_type() calls and use fan

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Message-Id: <201605261751.47334@pali>
Date:	Thu, 26 May 2016 17:51:47 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Thorsten Leemhuis <fedora@...mhuis.info>
Cc:	Jan C Peters <jcpeters89@...il.com>,
	David Santamaría Rogado <howl.nsp@...il.com>,
	Peter Saunderson <peteasa@...il.com>,
	Jean Delvare <jdelvare@...e.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Tolga Cakir <cevelnet@...il.com>, linux-hwmon@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dell-smm-hwmon: Cache fan_type() calls and use fan_status() for fan detection

On Thursday 26 May 2016 17:39:57 Thorsten Leemhuis wrote:
> > I need to know if this patch fixes problem on Dell Studio XPS 8000
> > and Dell Studio XPS 8100 machines, so we can revert git commits:
> > 6220f4ebd7b4 ("hwmon: (dell-smm) Blacklist Dell Studio XPS 8000")
> > a4b45b25f18d ("hwmon: (dell-smm) Blacklist Dell Studio XPS 8100")
> 
> Just checked: Sorry, that patch did not fix the CPU fan speed issue
> on my XPS 8000, so there is afaics no reason to revert 6220f4ebd7b4
> :-/

Please, can you apply patch "dell-smm-hwmon: In debug mode log duration 
of SMM calls" and compile dell-smm-hwmon in debug mode to tell us which 
SMM call takes too long? This is probably they key for that XPS 
problems...

-- 
Pali Rohár
pali.rohar@...il.com

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