linux-kernel - Re: [PATCH] drivers:gpu:vga_switcheroo: Work around dramatic power drain in laptops

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Message-ID: <20120428221003.49fb248d@pyramind.ukuu.org.uk>
Date:	Sat, 28 Apr 2012 22:10:03 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Alexander Tarasikov <alexander.tarasikov@...il.com>
Cc:	linux-kernel@...r.kernel.org, airlied@...ux.ie
Subject: Re: [PATCH] drivers:gpu:vga_switcheroo: Work around dramatic power
 drain in laptops

> 	This patch adds an experimental module parameter that causes
> 	vga_switcheroo to disable all inactive VGA cards after a resume
> 	to save power and avoid lockups/GPU freezes. This has been tested
> 	on a Sony VAIO laptop with Intel HD3000 and Ati Radeon 6630M GPU.

The module parameter is probably the wrong long term option. Do you know
if the problem is general or specific to some laptops. If it's the latter
then it might also be worth implementing a DMI and/or PCI detection
routine to match the laptops you know are afflicted and automatically
enabled it.

Alan
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