On Tuesday 20 December 2011 16:13:39 joeyli wrote: > 於 日，2011-12-18 於 23:47 +0800，joeyli 提到： > > > Hi Pali, > > > > 於 日，2011-12-18 於 11:59 +0100，Pali Rohár 提到： > > > > > 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? > > > > I am really sorry for I am sticking on another tough issue. > > I will look at your DSDT tomorrow. > > > > > > Thanks > > Joey Lee > > I just look at the DSDT of HP EliteBook, this machine check _OS name > string, it's essentially obsolete. > > Please add the following kernel parameter to /boot/grub/menu.lst: > acpi_os_name="Windows 2009" > > Let's by-pass the _OS name check first, hope it fix this issue. > > > Thanks > Joey Lee Hello, I tried to add one of these acpi_os_name into grub kernel command line: acpi_os_name="Windows 2009" acpi_os_name="Windows 2006" acpi_os_name="Windows 2001" acpi_os_name="Windows 2001 SP1" acpi_os_name="Windows 2001 SP2" but brightness control (via /sys/class/backlight/acpi_video0/brightness) did not worked. -- Pali Rohár pali.rohar@xxxxxxxxx
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