On Wednesday 10 June 2015 15:01:07 Hans de Goede wrote: > Currently we have 2 kernel commandline options + dmi-quirks in 3 places all > interacting (in interesting ways) to select which which backlight interface > to use. On the commandline we've acpi_backlight=[video|vendor] and > video.use_native_backlight=[0|1]. DMI quirks we have in > acpi/video-detect.c, acpi/video.c and drivers/platform/x86/*.c . > > This commit is the first step to cleaning this up, replacing the 2 cmdline > options with just acpi_video.backlight=[video|vendor|native|none], and > adding a new API to video_detect.c to reflect this. > > Follow up commits will also move other related code, like unregistering the > acpi_video backlight interface if it was registered before other drivers > which take priority over it are loaded, to video_detect.c where this > logic really belongs. > > Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> Hello, lot of people are using acpi_backlight parameter in kernel cmdline to fix some of problems. I would like to see this parameter still working and to not break existing configuration. E.g acpi_backlight=vendor to use dell-laptop.ko or thinkpad_acpi.ko backlight. It is still nightmare to get laptop panel backlight working on different (broken) laptops and people learnt to try to use acpi_backlight parameter for quit/hot fixing these problems. Upgrading kernel (if you remove acpi_backlight parameter) just break it again. -- Pali Rohár pali.rohar@xxxxxxxxx -- 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
