From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Richard Purdie <rpurdie@rpsys.net>
Cc: Dmitry Torokhov <dtor_core@ameritech.net>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [RESEND] Add Dell laptop backlight brightness display
Date: Tue, 7 Feb 2006 13:23:34 +0000 [thread overview]
Message-ID: <20060207132334.GA2331@srcf.ucam.org> (raw)
In-Reply-To: <1139317605.6422.26.camel@localhost.localdomain>
On Tue, Feb 07, 2006 at 01:06:45PM +0000, Richard Purdie wrote:
> This is total abuse of the backlight class. The idea is that
> cat /sys/class/backlight/ccc/brightness returns the *current* backlight
> brightness. On AC power it should return the AC brightness value and on
> DC power return the DC value.
Unfortunately, the hardware doesn't seem to give us that option. There's
no obvious way of determining whether we're on AC or DC from the kernel
without doing very nasty things with ACPI and APM (userspace can work it
out fairly easily).
Would you be open to adding generic support for displaying separate AC
and DC brightnesses? Making it driver specific leaves the potential for
inconsistencies.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2006-02-07 13:23 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-06 19:15 [PATCH] Make DMI code store chassis type Matthew Garrett
2006-02-06 19:18 ` [PATCH] Add HP laptop backlight brightness display Matthew Garrett
2006-02-06 19:19 ` [PATCH] Add Dell " Matthew Garrett
2006-02-07 0:37 ` [PATCH] [RESEND] " Matthew Garrett
2006-02-07 3:37 ` Dmitry Torokhov
2006-02-07 12:32 ` Matthew Garrett
2006-02-07 13:06 ` Richard Purdie
2006-02-07 13:23 ` Matthew Garrett [this message]
2006-02-07 13:37 ` Richard Purdie
2006-02-07 13:55 ` Matthew Garrett
2006-02-07 14:54 ` Richard Purdie
2006-02-08 9:06 ` Pavel Machek
2006-02-06 20:04 ` [PATCH] Add HP " Jan-Benedict Glaw
-- strict thread matches above, loose matches on Subject: below --
2006-02-07 3:43 [PATCH] [RESEND] Add Dell " Michael E Brown
2006-02-07 4:09 ` Matthew Garrett
2006-02-07 16:34 Michael_E_Brown
2006-02-07 17:20 ` Matthew Garrett
2006-02-12 17:26 ` Pavel Machek
2006-02-07 17:23 Michael_E_Brown
2006-02-20 16:45 Michael_E_Brown
2006-02-20 16:53 ` Pavel Machek
2006-02-23 5:17 ` Michael E Brown
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20060207132334.GA2331@srcf.ucam.org \
--to=mjg59@srcf.ucam.org \
--cc=dtor_core@ameritech.net \
--cc=linux-kernel@vger.kernel.org \
--cc=rpurdie@rpsys.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox