Diego Escalante Urrelo wrote: > Adding more information, > > I added ibm-acpi to my /etc/modules so my thinkpad is fully > acpi-functional and guess what? The brightness is not modified anymore!. > I suspect that without ibm-acpi, acpid or something else was > giving/reading bogus values about AC or battery and so the display kept > dimming. Right now I don't have the problem. >
Yes, the driver needs a IBM-specific ACPI support to control the backlight. It has been said by the maintainers, but it doesn't seem to be documented in the manpage. > If the problem is the missing ibm-acpi module, how could we fix this? > Should this be considered a mistake in the way the x driver decides to > dim the screen and hence the way it's reading the info needed for this > decision? or maybe this is more a acpid or acpi-support friends bug? > I don't think we can't blame the driver for doing this. backlight was completely broken and has been fixed thanks to this ACPI method. backlight is a mess since you have to support both the hotkeys that are managed by the BIOS, and the high-level programs that manage backlight through X. ACPI is probably the only way to avoid conflicts between these 2 methods. The good solution is probably to to make sure that ibm-acpi is loaded, that's probably udev's work (or the installer). And maybe add some documentation somewhere. Brice -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
