linux-kernel - BIOS-controlled FN keys works only with "acpi={off

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Message-ID: <20080714213755.7e892550@paolo-laptop>
Date:	Mon, 14 Jul 2008 21:37:55 +0200
From:	Paolo Ornati <ornati@...twebnet.it>
To:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>
Subject: BIOS-controlled FN keys works only with "acpi={off | ht}" on
 Samsung P500

Hello,

on this laptop, Samsung NP-P500Y, some function keys are
BIOS-controlled (they work before Linux boots).

As soon as Linux boots they stop working. Trying some boot options I've
found that "acpi=off" makes them work and the less drastic "acpi=ht"
works too.

I'm mostly interested in brightness adjusting... and since both
xbacklight and radeontool fail I've to use "acpi=ht".

Disabling ACPI is not a good idea on a laptop... so other boot
options/patches to try are welcomed :)

tested kernels: 2.6.22 / 2.6.24 (Ubuntu)
	2.6.18 - 2.6.26-rc9 (vanilla)

lspci:
00:00.0 Host bridge: ATI Technologies Inc Unknown device 7930
00:01.0 PCI bridge: ATI Technologies Inc Unknown device 7932
00:05.0 PCI bridge: ATI Technologies Inc Unknown device 7935
00:06.0 PCI bridge: ATI Technologies Inc Unknown device 7936
00:07.0 PCI bridge: ATI Technologies Inc Unknown device 7937
00:12.0 SATA controller: ATI Technologies Inc SB600 Non-Raid-5 SATA
00:13.0 USB Controller: ATI Technologies Inc SB600 USB (OHCI0)
00:13.1 USB Controller: ATI Technologies Inc SB600 USB (OHCI1)
00:13.2 USB Controller: ATI Technologies Inc SB600 USB (OHCI2)
00:13.3 USB Controller: ATI Technologies Inc SB600 USB (OHCI3)
00:13.4 USB Controller: ATI Technologies Inc SB600 USB (OHCI4)
00:13.5 USB Controller: ATI Technologies Inc SB600 USB Controller (EHCI)
00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 14)
00:14.1 IDE interface: ATI Technologies Inc SB600 IDE
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia
00:14.3 ISA bridge: ATI Technologies Inc SB600 PCI to LPC Bridge
00:14.4 PCI bridge: ATI Technologies Inc SBx00 PCI to PCI Bridge
01:05.0 VGA compatible controller: ATI Technologies Inc Radeon Xpress 1250
02:00.0 Ethernet controller: Atheros Communications Inc. AR242x 802.11abg Wireless PCI Express Adapter (rev 01)
05:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8039 PCI-E Fast Ethernet Controller (rev 15)

dmidecode and dmesg attached
View attachment "dmidecode" of type "text/plain" (7634 bytes)

View attachment "dmesg" of type "text/plain" (12495 bytes)