Hi David, I am currently investigating: https://bugs.freedesktop.org/show_bug.cgi?id=96572 Martin Peres suggested that your patches: https://lists.freedesktop.org/archives/dri-devel/2014-September/thread.html#67984 could solve the xf86-video-modesetting backlight issues. I have rebased your patches and I am working on an IGT test for the functionality. With my i915 implementation and the small included bug-fix, I can update the drm BACKLIGHT property and the value is updated in the backlight class device. However, if I set the brigness value through the sysfs file of the backlight class device the drm BRIGHTNESS property does not update which would be confusing to users. My understanding is that DRM properties are cached and, by design, do not have the capability to read the status from the driver. What do we want to do about this? Marta David Herrmann (4): backlight: use static initializers backlight: use spin-lock to protect device list backlight: add kernel-internal backlight API drm: link connectors to backlight devices Marta Lofstedt (2): i915: Use drm backlight drm: drm_backlight use the connect value to set brightness property drivers/gpu/drm/Kconfig | 1 + drivers/gpu/drm/Makefile | 2 +- drivers/gpu/drm/drm_backlight.c | 387 ++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/drm_connector.c | 11 + drivers/gpu/drm/drm_crtc.c | 6 + drivers/gpu/drm/drm_drv.c | 8 + drivers/gpu/drm/drm_sysfs.c | 54 +++++ drivers/gpu/drm/i915/intel_panel.c | 5 + drivers/video/backlight/backlight.c | 91 +++++++-- include/drm/drm_backlight.h | 44 ++++ include/drm/drm_connector.h | 3 + include/drm/drm_crtc.h | 5 + include/linux/backlight.h | 17 ++ 13 files changed, 621 insertions(+), 13 deletions(-) create mode 100644 drivers/gpu/drm/drm_backlight.c create mode 100644 include/drm/drm_backlight.h -- 2.9.3 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
