linux-kernel - Re: [PATCH] powernow-k8: On load failure, remind the user to enable support in BIOS setup

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Date:	Wed, 20 Jan 2010 19:19:33 +0200
From:	Marti Raudsepp <marti@...fo.org>
To:	Thomas Renninger <trenn@...e.de>
Cc:	cpufreq@...r.kernel.org, Dave Jones <davej@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Mark Langsdorf <mark.langsdorf@....com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powernow-k8: On load failure, remind the user to
 enable support in BIOS setup

On Wed, 2010-01-20 at 16:56 +0100, Thomas Renninger wrote:
> But most often this happens if people upgrade their CPU and do not 
> update their BIOS.
> Or the vendor does not recognise the new CPU even if the BIOS got 
> updated.

Maybe some of those people just didn't realize it was disabled in BIOS?
If you tell users that it's a firmware bug then they'll probably just
give up.

> The itself message might be an enhancment, IMO it's not worth a patch.

Why do you think so? I spent an hour on hunting down the BIOS upgrade,
only to find that it didn't improve anything. It was a day later that I
realized that it might be a BIOS option; and the option was literally
the _last_ option in the whole BIOS setup. :)

This message would have saved the day.

> But do not revert the FW_BUG part!

Sure, you have a point here.

How about this patch?

---
powernow-k8: On load failure, tell user to update BIOS and enable in BIOS setup

Signed-off-by: Marti Raudsepp <marti@...fo.org>

diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
@@ -800,6 +800,8 @@
 	 * www.amd.com
 	 */
 	printk(KERN_ERR FW_BUG PFX "No PSB or ACPI _PSS objects\n");
+	printk(KERN_ERR PFX "Make sure that your BIOS is up to date"
+		" and Cool'N'Quiet support is enabled in BIOS setup\n");
 	return -ENODEV;
 }
 



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