From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Seth Forshee <seth.forshee@canonical.com>
Cc: Len Brown <lenb@kernel.org>, "Rafael J. Wysocki" <rjw@sisk.pl>,
linux-acpi@vger.kernel.org, Ben Jencks <ben@bjencks.net>,
joeyli <jlee@suse.com>
Subject: Re: [PATCH] ACPI: Disable Windows 8 compatibility for some Lenovo ThinkPads
Date: Mon, 11 Feb 2013 19:09:14 +0000 [thread overview]
Message-ID: <20130211190914.GA27364@srcf.ucam.org> (raw)
In-Reply-To: <20130211190617.GH13768@thinkpad-t410>
On Mon, Feb 11, 2013 at 01:06:17PM -0600, Seth Forshee wrote:
> On Mon, Feb 11, 2013 at 05:52:13PM +0000, Matthew Garrett wrote:
> > So the problem is that userspace is writing values that don't happen to
> > be aligned with the values the hardware reacts to, and so nothing gets
> > changed?
>
> Yes. The values are valid according to to _BCL, but _BCM is discarding
> any values that aren't contained in an array named BRTW. BRTW is
> literally the object returned by _BCL returns for !Windows 2012. Here's
> a link to the AML if you'd like to take a look.
Right. My concern here is that Windows clearly doesn't trigger the
issue, and so there's some chance that we'll see similar issues on other
machines. Disabling Windows 8 compatibility isn't really an option. One
choice might be to have the ACPI video driver set all intermediate
values if the system makes the Windows 8 OSI call?
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2013-02-11 19:09 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-11 16:21 [PATCH] ACPI: Disable Windows 8 compatibility for some Lenovo ThinkPads Seth Forshee
2013-02-11 17:52 ` Matthew Garrett
2013-02-11 19:06 ` Seth Forshee
2013-02-11 19:09 ` Matthew Garrett [this message]
2013-02-11 19:31 ` Rafael J. Wysocki
2013-02-12 3:05 ` Seth Forshee
2013-02-13 20:32 ` Seth Forshee
2013-02-13 20:55 ` Matthew Garrett
2013-02-13 21:04 ` Ben Jencks
2013-02-13 21:49 ` Seth Forshee
2013-02-13 21:46 ` Seth Forshee
2013-02-13 21:54 ` Matthew Garrett
2013-02-13 22:04 ` Seth Forshee
2013-03-07 19:38 ` Seth Forshee
2013-03-07 19:39 ` [PATCH 1/5] ACPICA: Add interface for getting latest Windows version requested via _OSI Seth Forshee
2013-03-07 19:39 ` [PATCH 2/5] acpi_video: Avoid unnecessary conversions between backlight levels and indexes Seth Forshee
2013-03-07 19:39 ` [PATCH 3/5] acpi_video: Add workaround for broken Windows 8 backlight implementations Seth Forshee
2013-04-04 11:44 ` Aaron Lu
2013-04-04 12:35 ` Seth Forshee
2013-04-04 13:46 ` Aaron Lu
2013-04-04 14:02 ` Seth Forshee
2013-04-04 14:27 ` Aaron Lu
2013-03-07 19:39 ` [PATCH 4/5] acpi_video: Disable use of _BQC when value doesn't match those set through _BCM Seth Forshee
2013-03-07 19:39 ` [PATCH 5/5] acpi_video: Don't handle ACPI brightness notifications by default Seth Forshee
2013-08-02 5:55 ` Aaron Lu
2013-08-02 14:41 ` Rafael J. Wysocki
2013-08-02 14:52 ` Aaron Lu
2013-08-03 0:26 ` Rafael J. Wysocki
2013-08-03 9:46 ` Aaron Lu
2013-08-03 11:23 ` Rafael J. Wysocki
2013-08-03 12:10 ` Aaron Lu
2013-08-03 22:07 ` Rafael J. Wysocki
2013-08-04 1:08 ` Aaron Lu
2013-03-18 21:25 ` [PATCH] ACPI: Disable Windows 8 compatibility for some Lenovo ThinkPads Seth Forshee
2013-04-02 5:18 ` Ben Jencks
2013-04-02 9:15 ` Aaron Lu
2013-04-02 11:23 ` Matthew Garrett
2013-04-02 13:44 ` Aaron Lu
2013-04-02 19:08 ` Matthew Garrett
2013-04-19 12:24 ` Seth Forshee
2013-04-20 22:06 ` Rafael J. Wysocki
2013-04-21 2:29 ` Seth Forshee
2013-04-21 15:46 ` Henrique de Moraes Holschuh
2013-02-13 21:09 ` Ben Jencks
2013-04-01 1:53 ` Aaron Lu
2013-04-01 13:03 ` Seth Forshee
2013-04-02 9:08 ` Aaron Lu
2013-04-02 13:00 ` Seth Forshee
2013-04-02 13:43 ` Aaron Lu
2013-04-03 7:04 ` Ben Jencks
2013-04-03 7:27 ` Aaron Lu
2013-04-03 13:45 ` Seth Forshee
2013-04-04 11:39 ` Aaron Lu
2013-04-19 3:15 ` Aaron Lu
2013-04-20 22:06 ` Rafael J. Wysocki
2013-04-21 11:07 ` Aaron Lu
2013-04-21 12:11 ` Aaron Lu
2013-04-21 21:42 ` Rafael J. Wysocki
2013-04-22 9:39 ` Aaron Lu
2013-04-22 11:51 ` Rafael J. Wysocki
2013-04-22 12:11 ` Aaron Lu
2013-04-22 13:06 ` Seth Forshee
2013-04-22 13:40 ` Aaron Lu
2013-04-22 13:56 ` Seth Forshee
2013-04-22 14:07 ` Aaron Lu
2013-04-22 15:11 ` Seth Forshee
2013-04-22 2:18 ` joeyli
2013-04-22 10:08 ` Aaron Lu
2013-04-22 12:00 ` joeyli
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