Hi Pali, 於 五，2011-12-09 於 22:36 +0800，Li Joey 提到： > > > ---------- Forwarded message ---------- > From: Pali Rohár <pali.rohar@xxxxxxxxx> > Date: 2011/7/15 > Subject: Brightness on HP EliteBook 8460p > To: linux-acpi@xxxxxxxxxxxxxxx > > > Hello, > > on my HP EliteBook 8460p is not possible to set display brightness > when ACPI > is enabled in kernel. Entries in sysfs is properly created without > errors. But > when I try write any value > to /sys/class/backlight/acpi_video0/brightness > nothing happened (and no error is in dmesg). When I press Fn key for > chaining > display brightness kernel send correct key event (tested with xev) but > nothing > happened too. > > When I disabled ACPI (acpi=off in kernel command line) all Fn keys are > broken > and not working (no events in xev). But brightness keys working (I > think on HW > level, because xev does not see it) - increase and decrease display > brightness. > > So what can I do with my notebook? I think that there is error/bug in > BIOS or > ACPI because with disabled ACPI brightness working. But with disabled > ACPI is > notebook unuseable (no battery info, no Fn keys, no WIFI rfkill, ...). > Can > somebody help me with this problem? > > -- > Pali Rohár > pali.rohar@xxxxxxxxx > You can try to put kernel parameter: acpi_osi="!Windows 2009" to /boot/grub/menu.lst, then reboot look at maybe better. And, could you please kindly share DSDT and dmidecode to me? Plesae login by root then: % acpidump > acpidump.dat % dmidecode > dmidecode.log Thanks a lot! Joey Lee -- 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
