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  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Tue, 10 Nov 2009 00:37:59 +0900
From:	InKi Dae <daeinki@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, Kyungmin Park <kmpark@...radead.org>
Subject: Re: [patch] added brightness feature to lcd class.

are you saying me that user shouldn't know if it is TFT-LCD or AMOLD?
I agree your saying.

if lcd class has brightness feature then sysfs file for controlling
brightness will be placed
in /sys/class/lcd/*/brightness.
it would be a problem because the path is no sysfs you expected.

how about that symbolic link file is created by lcd class for user?
like this,
/sys/class/lcd/*/brightness -> /sys/class/backlight/*/brightness

for this, some codes of creating symbolic link file should be added to
lcd class.

I still think it is not good way that lcd panel driver not having
backlight device has backlight driver
to control brightness and it should be solved in the course of time.

thank you.

2009/11/8 Pavel Machek <pavel@....cz>:
> On Sat 2009-11-07 21:43:50, InKi Dae wrote:
>> Thank you for your comments.
>>
>> using backlight is good way in case of TFT-LCD Panel.
>> because TFT-LCD Panel needs backlight device to light up.
>>
>> but AMOLED LCD Panel doesn't need backlight device because lighting up itself.
>
> I know. So what?
>
> User wants to set brightness. Why should userspace know/care if it is
> TFT or AMOLED?
>
> I have this script:
>
> #!/bin/bash
> echo $1 > /sys/class/backlight/*/brightness
>
> why should I have to rewrite it just because you decided amoled is
> special?
>
> Kernel is expected to provide hw abstraction...
>
>                                                                        Pavel
>
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
>
--
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/

Powered by blists - more mailing lists