On Thu, 16 Jul 2009, Tobias Diedrich wrote: > Ok, after compiling it as a module and trying a few variations, it > seems that on my X41 Tablet only brightness_mode=2 works, that is > TPACPI_BRGHT_MODE_UCMS_STEP. Ok... > This is contrasted by thinkpad_acpi.c which states: > |if (acpi_evalf(ec_handle, NULL, "HBRV", "qd")) > | /* T40-T43, R50-R52, R50e, R51e, X31-X41 */ > | brightness_mode = TPACPI_BRGHT_MODE_ECNVRAM; > |else > | /* all other IBM ThinkPads */ > | brightness_mode = TPACPI_BRGHT_MODE_UCMS_STEP; > > So TPACPI_BRGHT_MODE_ECNVRAM looks broken somehow? Does the brightness change if you mess with /proc/acpi/ibm/brightness ? If it doesn't, then it means your thinkpad doesn't use the EC to control brightness. And that will, of course, cause the driver to set the brightness in NVRAM to zero (but it *should* do so for shutdown as well, not just machine-restart. You may have uncovered two bugs, not just one), which will be honoured by the BIOS on the next reboot/power up. > I assume that the autodetection finds the HBRV acpi function and > selects the former, resulting in a not working backlight control. Yes. Please send me by private mail the output of acpidump and dmidecode (so that I will have them both in the same place). I will blacklist your thinkpad to force TPACPI_BRGHT_MODE_UCMS_STEP. I wonder if other Intel GMA900 thinkpads also need this blacklisting, though... this is the first report I got about HBRV not being good enough. -- "One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie." -- The Silicon Valley Tarot Henrique Holschuh ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ ibm-acpi-devel mailing list ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/ibm-acpi-devel
