https://bugzilla.kernel.org/show_bug.cgi?id=35622
--- Comment #17 from Lee, Chun-Yi <j...@novell.com> 2011-05-26 21:57:00 --- (In reply to comment #15) > Created an attachment (id=59602) --> (https://bugzilla.kernel.org/attachment.cgi?id=59602) [details] > dmesg after echo * > /sys/class/backlight/acpi_video0/brightness > > echo 2 > /sys/class/backlight/acpi_video0/brightness and > echo 9 > /sys/class/backlight/acpi_video0/brightness > don't work. > Please find dmesg after these commands in the attached file. > Thank you! Per your DSDT, in _BCM method, it write a value to the BRTS register in EC, I believe this register handle brightness level: Method (_BCM, 1, NotSerialized) { Divide (Arg0, 0x0A, Local0, Local1) Decrement (Local1) Store (Local1, ^^^LPCB.EC0.BRTS) } But, look like the EC firmware didn't change brightness when BRTS modified, that's not make sense because it must be works on Windows 7. Your dmesg on comment #14 confirm we are running the same logic path with Windows 7. Next step is: we need to make sure the _BCM store value to BRTS is success, we need monitor the EC's memory block. I will find a good way for you to monitor it, might need EC expert's help. -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. ------------------------------------------------------------------------------ vRanger cuts backup time in half-while increasing security. With the market-leading solution for virtual backup and recovery, you get blazing-fast, flexible, and affordable data protection. Download your free trial now. http://p.sf.net/sfu/quest-d2dcopy1 _______________________________________________ acpi-bugzilla mailing list acpi-bugzilla@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
