On 4/14/10, Chris Bagwell <[email protected]> wrote: > Hi all, > > I've seen the following issue reported on various web pages but not sure if > it was directly reported. First up, you guys know about issue with acpi_osi > of "Windows 2009" disables eeepc_backend and thats were eeepc_wmi comes in.
[Subsequent messages from Chris clarified that both eeepc-laptop and eeepc-wmi suffer as described below] > There is a secondary bug though if you boot with acpi_osi="!Windows 2009" > (or "Linux"). The ACPI driver will take control of backlight controls with > Fn-F5/F6. Those keys will work but has issues with Gnome and other user > processes. > > Anything that uses any of the /sys/* interfaces to control backlight do not > work correctly. When software cycles threw levels, the behavior is kinda > odd. It will cycle each time you dim to something like > Bright->Dim->Bight->Off->Bright->etc. Also, Gnome will give no feedback > because eeepc_laptop discards the events and it will not make it to > /dev/input/event*. And last, the status of current brightness is never > updated under /sys/* correctly which confuses Gnome as well. > > The secondary work around is to add acpi_backlight=vendor to boot options. > Then eepc_backlight takes charge and life is good. Gnome gives visual > feedback and dimmer works as expected. > > Baring a firmware fix from Asus, would it be possible to enable some sort of > backlist for using ACPI backlight support and have 1005P's use eeepc_laptop? > > Chris I suggest you contact the ACPI video maintainer, Zhang Rui <[email protected]>, and attach the output of "dmidecode". The best way would probably be to report the problem on bugzilla.kernel.org (on the ACPI video driver). I think it will indeed be possible to blacklist your machine, because someone has already anticipated this problem :-). drivers/acpi/video_detect.c: long acpi_video_get_capabilities(acpi_handle graphics_handle) ... /* Add blacklists here. Be careful to use the right *DMI* bits * to still be able to override logic via boot params, e.g.: * * if (dmi_name_in_vendors("XY")) { ... * acpi_video_support |= * ACPI_VIDEO_BACKLIGHT_DMI_VENDOR; *} */ Regards Alan -- To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
