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

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Date:	Thu, 2 Jun 2016 15:06:08 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Peter Saunderson <peteasa@...il.com>
Cc:	Thorsten Leemhuis <fedora@...mhuis.info>,
	Jan C Peters <jcpeters89@...il.com>,
	David Santamaría Rogado <howl.nsp@...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 Monday 30 May 2016 17:25:26 Peter Saunderson wrote:
> On 30/05/16 10:36, Pali Rohár wrote:
> >Hi Peter! Thank you for information! Are you able to try to call that
> >function on some old kernel (e.g. 3.12 or 3.14) to verify that it is
> >caused only and only by that function?
> >
> I have tried to use my old 3.19.0 kernel that did not have the problem but
> now it will not boot.  The boot screen is left with
> 
> Loading Linux linux...
> Loading initial ramdisk...
> 
> No logs etc.. I am guessing that some grub or ram disk change is giving me
> the problem.  I have just upgraded to Ubuntu 16.04 and do not want to
> downgrade so I am a bit stuck at the moment and doubt that I can do this
> test.
> 
> Peter.

You can try to regenerate initramfs with ubuntu command:

$ sudo update-initramfs -u -k all

In case you modified or updated some initram files or kernel modules you
need to regenerate it to take effect at boot... -k all tells to
regenerate *all* initramfs images, not only for currently booted kernel.

-- 
Pali Rohár
pali.rohar@...il.com