linux-kernel - ACPI video.c brightness handler conflicts with toshiba

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 6 Sep 2008 11:08:33 +0400
From:	Andrey Borzenkov <arvidjaar@...l.ru>
To:	toshiba_acpi@...ebeam.org, linux-acpi@...r.kernel.org
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: ACPI video.c brightness handler conflicts with toshiba_acpi

I have now two different devices that refer to the same hardware:

lrwxrwxrwx 1 root root 0 2008-09-06 11:04 acpi_video0 -> ../../devices/virtual/backlight/acpi_video0/
lrwxrwxrwx 1 root root 0 2008-09-06 11:04 toshiba -> ../../devices/virtual/backlight/toshiba/

Unfortunately, due to ACPI implementation the acpi_video0 one is much
inferior (as it provides only effectively two levels instead of 8);
and user level tools are apparently quite confused which one to select.

Is there any mechanism that would allow tochiba_acpi to claim brightness
for internal LCD screen that video would not attempt to grab it too?

Of course manually disabling brightness handling in video is always possible,
still is nice for this to be handled automatically.

Download attachment "signature.asc " of type "application/pgp-signature" (198 bytes)