http://bugzilla.kernel.org/show_bug.cgi?id=12450
------- Comment #15 from [email protected] 2009-01-22 21:17 ------- On the Asus laptop there exist three issues when using the latest kernel. a. Asus platform backlight device Vs ACPI generic backlight device On the latest kernel the ACPI generic backlight device will be preferred. But it can't work as expected. After the boot option of "acpi_backlight=vendor" is added, the platform backlight device will be used. In such case it can work well. b. backlight brightness is reverted on the 2.6.28 kernel This is caused by the broken BIOS. On the box the following package is returned by the _BCL object, which is opposite to the brightness order on most laptops.At the same time the backlight index is returned instead of real brightness. >Method (_BCL, 0, NotSerialized) { Return (Package (0x10) { 0x0F, 0x0E, 0x0D, 0x0C,0x0B, 0x0A, 0x09,0x08, 0x07, 0x06, 0x05, 0x04,0x03, 0x02, One, Zero }) } Of course the reverted order is fixed by the following commit: >commit 935e5f290ec1eb0f1c15004421f5fd3154380fd5 >Author: Zhang Rui <[email protected]> >Date: Thu Dec 11 16:24:52 2008 -0500 >ACPI: video: Fix reversed brightness behavior on ThinkPad SL series The above commit is already shipped in the 2.6.29-rc1. c. it will fall back to the lowest level when keeping on pressing up hotkey. I have no idea about this issue. Will you please try the custom DSDT and see whether this issue still exists? Thanks. -- Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is. ------------------------------------------------------------------------------ This SF.net email is sponsored by: SourcForge Community SourceForge wants to tell your story. http://p.sf.net/sfu/sf-spreadtheword _______________________________________________ acpi-bugzilla mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
