From: "Richard Schütz" <r.schtz@t-online.de>
To: Nikolai Kondrashov <spbnick@gmail.com>
Cc: Greg KH <greg@kroah.com>, Matthew Garrett <mjg@redhat.com>,
Randy Dunlap <rdunlap@xenotime.net>,
linux-kernel@vger.kernel.org,
platform-driver-x86@vger.kernel.org
Subject: Re: [PATCH] Platform: add Samsung Laptop platform driver
Date: Sun, 13 Mar 2011 11:55:36 +0100 [thread overview]
Message-ID: <4D7CA2A8.4010700@t-online.de> (raw)
In-Reply-To: <4D7C9668.3000902@gmail.com>
> Every time I execute this in the /sys/class/backlight/samsung directory:
> sudo bash -c 'echo 1 > brightness'
> brightness is reduced a little until it reaches the minimum.
>
> After that, every time I execute this:
> sudo bash -c 'echo 8 > brightness'
> it increases a little until it reaches the maximum.
>
> And each time a message appears in dmesg: "ACPI: Failed to switch the
> brightness", until the brightness stops changing.
>
> At the same time, the little Gnome brightness adjustment window appears,
> showing the percentage of the brightness, which drops/raises to
> minimum/maximum in only four executions of these commands. After that,
> while
> brightness drops/raises with each execution, the percentage stays at
> minimum/maximum.
>
> Is this all normal?
That sounds like the driver is interfering with the ACPI video driver.
Add "acpi_backlight=vendor" to your kernel boot parameters and try again.
--
Regards,
Richard Schütz
next prev parent reply other threads:[~2011-03-13 10:55 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-09 22:40 [PATCH] Platform: add Samsung Laptop platform driver Greg KH
2011-02-09 22:44 ` Randy Dunlap
2011-02-09 22:50 ` Greg KH
2011-02-09 22:58 ` Matthew Garrett
2011-02-09 22:50 ` Matthew Garrett
2011-02-09 23:02 ` Greg KH
2011-02-11 9:17 ` Jouke Witteveen
2011-02-11 11:37 ` Richard Schütz
2011-02-11 15:22 ` Greg KH
2011-02-11 16:27 ` Richard Schütz
2011-02-25 21:01 ` Greg KH
2011-02-11 15:45 ` Matthew Garrett
2011-02-11 18:42 ` Greg KH
2011-02-16 10:06 ` Nikolai Kondrashov
2011-02-25 21:03 ` Greg KH
2011-02-25 21:49 ` Nikolai Kondrashov
2011-02-25 22:50 ` Greg KH
2011-03-10 7:00 ` Nikolai Kondrashov
2011-03-10 17:01 ` Greg KH
2011-03-10 17:13 ` Nikolai Kondrashov
2011-03-10 17:19 ` Greg KH
2011-03-10 17:28 ` Nikolai Kondrashov
2011-03-10 18:09 ` Greg KH
2011-03-10 21:05 ` Nikolai Kondrashov
2011-03-10 21:15 ` Greg KH
2011-03-11 7:12 ` Nikolai Kondrashov
2011-03-11 17:03 ` Greg KH
2011-03-11 19:07 ` Nikolai Kondrashov
2011-03-11 19:34 ` Greg KH
2011-03-11 20:20 ` Nikolai Kondrashov
2011-03-11 20:23 ` Nikolai Kondrashov
2011-03-11 20:35 ` Greg KH
2011-03-11 20:30 ` Greg KH
2011-03-13 10:03 ` Nikolai Kondrashov
2011-03-13 10:55 ` Richard Schütz [this message]
2011-03-13 13:02 ` Nikolai Kondrashov
2011-03-13 16:18 ` Greg KH
2011-03-13 17:49 ` Nikolai Kondrashov
2011-03-13 17:58 ` Greg KH
2011-03-13 16:17 ` Greg KH
2011-03-13 16:28 ` Matthew Garrett
2011-03-13 17:51 ` Nikolai Kondrashov
2011-03-13 17:50 ` Nikolai Kondrashov
-- strict thread matches above, loose matches on Subject: below --
2011-02-25 22:47 Greg KH
2011-02-27 15:36 Greg KH
2011-03-05 4:24 Greg KH
2011-03-05 4:24 ` Greg KH
2011-03-11 17:43 ` Matthew Garrett
2011-03-11 19:35 ` Greg KH
2011-03-11 19:44 ` Matthew Garrett
2011-03-11 19:52 ` Greg KH
2011-03-11 19:55 ` Matthew Garrett
2011-03-14 15:18 ` Jörg-Volker Peetz
2011-03-11 17:57 Tommaso Massimi
2011-06-26 15:08 J Witteveen
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