On Sat, Dec 06, 2008 at 05:33:36PM +0100, Matthias Heinz wrote: > f0: 09 08 34 07 ff 00 00 00 a0 0f 07 00 20 10 b6 bd ^^^^^^^^^^^ Ok, that indicates that your system claims opregion support, which would explain the difference in behaviour since 2.6.26. > Interrupt enable: 00000053 > Interrupt identity: 00000000 > Interrupt mask: fffedfae > Pipe A stat: 00040000 > Pipe B stat: 00400206 And this indicates that there's a legacy backlight control event waiting to be handled, but no interrupt appears to have been raised. Does hitting the brightness key result in "Interrupts received" changing? -- Matthew Garrett | mjg59@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html