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Message-ID: <20080215110213.GA5648@ics.muni.cz> Date: Fri, 15 Feb 2008 12:02:13 +0100 From: Lukas Hejtmanek <xhejtman@....muni.cz> To: Henrique de Moraes Holschuh <hmh@....eng.br> Cc: linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org Subject: Re: 2.6.25-rc1 regression - IBM ACPI backlight On Thu, Feb 14, 2008 at 10:24:52AM -0200, Henrique de Moraes Holschuh wrote: > > as of 2.6.25-rc1, there is no more /sys/class/backlight/acpi_video1 which > > controlled LVDS backlight on Lenovo ThinkPad T61. There is still > > acpi_video0 which seems to have sane values but echo N > brightness has no > > effect at all. > > > > thinkpad_acpi module reports that ACPI controlled backlight is present. > > Please report this to linux-acpi @ vger . kernel . org... > > It is likely caused by the stuff to locate and disable the unused video > device in the DSDT (apparently it got the wrong device?!). > > However, BEFORE reporting to linux-acpi, please test it in single user mode > without X *ever* being loaded on that boot. New X disables the BIOS > brightness changes that ACPI uses. 2.6.24 kernel has two acpi_video[01]. 2.6.25-rc1 does not, it contains only acpi_video0 (even in text mode in single user without X being loaded) which does not work at all. -- Lukáš Hejtmánek -- 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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