On Thu, 2007-07-05 at 10:37 -0300, Henrique de Moraes Holschuh wrote: > On Thu, 05 Jul 2007, Alfredo Matos wrote: > > 4 brigs up the brightness, while 5 lowers. It works, though no change > > detected in the 0x31 register. > > That's the old CMOS API for changing brightness. So, that means we *can* > support it in these machines, and I won't even bitch at Lenovo for switching > back to the old API... as long as it works, I don't think we are in a > position to care much about it. > > We can probably get the current brightness from the CMOS api too. > > Please check if position 0x5E in the output of > hexdump -C /dev/nvram > has the brightness level (0..7) in the lowest three bits. > Yeap, it's there, and updated. > What stumps me is that ibm-acpi and thinkpad-acpi already uses *both* APIs > for brightness changes at the same time, so it should be working. Either > there is a bug in the code, or using the two APIs at the same time confuses > your thinkpad :( > > At least it means that we can fix it, somehow. It would be easy if Lenovo > had had the decency to remove ECOR.HBRV from ACPI since they are not using > it anymore. > > It is also a good idea to read the ACPI specification 3.0b, and check what > is the ACPI standard way of dealing with display brightness. If Lenovo is > supporting that one, it is best to just switch to it on Lenovo thinkpads. > > > Earlier in the thread i mentioned that g-p-m in Ubuntu Gutsy (7.10) > > using 2.6.22-rcx kernel picks up the correct brightness level. Since > > Richard is following this thread, maybe he can shed some light on why > > g-p-m picks up the brightness change even though thinkpad_acpi does not. > > Probably from the CMOS. > Do you need any more info ? Alfredo. ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ ibm-acpi-devel mailing list ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/ibm-acpi-devel
