Hi Mattew, 於 一，2010-07-12 於 03:27 +0100，Matthew Garrett 提到： > On Sun, Jul 11, 2010 at 08:12:57PM -0600, Joey Lee wrote: > > > He tested the drm blacklist patch can works fine on his computer, it's > > also works on VESA mode because the acpi _BCM, _BQC direct change > > brightness by opregion. > > Sorry, I write a wrong information, the MSI poulsbo netbook change brightness by ec command in _BCM, _BQC, not opregion. > > What can we do for this situtation? I mean if the BIOS have opregion > > implementation but there have no opensource drm driver or native video > > driver support opregion on Linux? > > The cleanest way would be to implement a stub backlight control driver > for the chip - there should be enough information in the source of the > poulsbo drm to do that. M... Follow your suggestion, I am tracing the i915 drm driver and Poulsbo drm driver from here: http://sourceforge.net/mailarchive/message.php?msg_name=49C2ADA8.2090405%40shipmail.org I am not sure fully understood your suggestion... Did you mean we can extract some parts from Poulsbo drm driver and put it to a stub backlight control driver for Poulsbo? Where can we put the stub driver? Do we still put it in i915 drm? On the other hand, the Poulsbo is a old and stop ship chip, do we still want to add a special driver for it? > The main problem with the blacklist approach is > that there's no guarantee that all poulsbo systems will have a working > acpi method, and I /think/ there's a couple more PCI IDs that ought to > be covered in any case. On the other hand doing it properly does involve > writing rather a lot more code, and the fact that Intel have shown > absolutely no interest in making their hardware work means that the > quick hack might be the most reasonable thing to do. > Thank's for your remind, I fully agreed cann't guarantee all poulsbo systems have working acpi method. But, I am sure the MSI U110/U115 have workable acpi backlight method. Do you think it's good to put the special DMI detection in msi-laptop driver to enable the the acpi backlight control by call acpi_video_register in acpi video? But will cause msi-laptop driver dependency to acpi video driver. Need your kindly suggestion! Thank's a lot! Joey Lee -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
