From: "James H. Cloos Jr." <cloos-GRsvFm/Gh/pBDgjK7y7TUQ@public.gmane.org>
To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: lcd backlight
Date: 12 Jul 2003 21:34:35 -0400 [thread overview]
Message-ID: <m365m7jjkk.fsf@lugabout.jhcloos.org> (raw)
A bios setting causes a regular screen blank, but w/ acpi the lcd's
backlight is left on.
The following function (based on 's radeontools) controls the
backlight perfectly:
void radeon_cmd_light(int param)
{
unsigned long dac_cntl;
dac_cntl = radeon_get(RADEON_LVDS_GEN_CNTL,"RADEON_LVDS_GEN_CNTL");
if(param != 0) {
dac_cntl |= RADEON_LVDS_ON;
} else {
dac_cntl &= ~ RADEON_LVDS_ON;
}
radeon_set(RADEON_LVDS_GEN_CNTL,"RADEON_LVDS_GEN_CNTL",dac_cntl);
}
What needs to be done, given this info on how to control the
backlight and the bios's dsdt, to convince the kernel to toggle
the backlight when the screen blanks?
-JimC
-------------------------------------------------------
This SF.Net email sponsored by: Parasoft
Error proof Web apps, automate testing & more.
Download & eval WebKing and get a free book.
www.parasoft.com/bulletproofapps1
next reply other threads:[~2003-07-13 1:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-13 1:34 James H. Cloos Jr. [this message]
[not found] ` <m365m7jjkk.fsf-eUECQUGGJJCHAtaq1fIXeWD2FQJk+8+b@public.gmane.org>
2003-07-13 4:11 ` lcd backlight Jonathan Steinert
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=m365m7jjkk.fsf@lugabout.jhcloos.org \
--to=cloos-grsvfm/gh/pbdgjk7y7tuq@public.gmane.org \
--cc=acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org \
/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