On Friday 09 December 2011 16:46:29 Pali Rohár wrote: > On Friday 09 December 2011 22:49:09 joeyli wrote: > > 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 > > Hello, > > adding any acpi_osi values did not changed anything (also tried other osi > strings from decompiled DSDT table). Brightness problem is in both BIOS and > UEFI boot mode. > > I attached acpidump and dmidecode output from bios and uefi mode too. Did you find way how to control display brightness? -- Pali Rohár pali.rohar@xxxxxxxxx
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