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Date: Sun, 13 Mar 2011 11:55:36 +0100 From: Richard Schütz <r.schtz@...nline.de> To: Nikolai Kondrashov <spbnick@...il.com> CC: Greg KH <greg@...ah.com>, Matthew Garrett <mjg@...hat.com>, Randy Dunlap <rdunlap@...otime.net>, linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org Subject: Re: [PATCH] Platform: add Samsung Laptop platform driver > 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 -- 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/
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