linux-kernel - Re: video breaks asus-laptop display switching

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-prev] [day] [month] [year] [list]

Date:	Sat, 22 Dec 2007 00:21:57 -0800 (PST)
From:	Andrei Gaponenko <andrei.gaponenko@...n.ch>
To:	Zhang Rui <rui.zhang@...el.com>
cc:	linux-kernel@...r.kernel.org, corentincj@...aif.net,
	sziwan@...rs.sourceforge.net
Subject: Re: video breaks asus-laptop display switching


On Sat, 22 Dec 2007, Zhang Rui wrote:

> On Sat, 2007-12-22 at 06:36 +0800, Andrei Gaponenko wrote:
>>
>> With 2.6.23 or newer (including 2.6.24-rc6) kernels, writing to the
>> /sys/devices/platform/asus-laptop/display file does not do anything:
>> ...
>>
> hmm, please "echo 1 > /proc/acpi/video/xxx/DOS" in 2.6.23 and see
> if there is any difference.

ls /proc/acpi/video/
shows two identically named directories "VGA" - is this normal??

Anyway,

# cat VGA/DOS
DOS setting: <1>

# echo 3 > VGA/DOS
# cat VGA/DOS
DOS setting: <3>

but no image on external.  Now

# rmmod video
# echo 3 > /sys/devices/platform/asus-laptop/display

Got image on external

# modprobe video
# cat VGA/DOS
DOS setting: <0>

I can write 1 or 3 to DOS and read it back, but it has no effect (image on 
external turned on while video module was removed does not go away).

Please Cc: me on replies - forgot to mention this in the initial posting.

Thanks!
Andrei
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/