On Fri, Sep 7, 2012 at 4:22 PM, Seth Forshee <seth.forshee@xxxxxxxxxxxxx> wrote: > Many hybrid graphics Apple laptops fail to set up LVDS on the secondary > GPU due to missing or incorrect mode information for the panel at init > time. The only way to get the LVDS mode on these machines is via the > DDC, but this is muxed to the active GPU at boot. However, the graphics > mux on these machines supports muxing the i2c idependently of the > display, making it possible for the secondary graphics driver to read > the EDID without a full display switch. > > In order to support this, these patches modify vga_switcheroo to allow > muxing of the DDC idependently of the display. apple-gmux is updated to > support this new functionality, and drm_get_edid() is modified to switch > the DDC mux as needed. > > For this to work we also need to ensure that sufficient switcheroo > suport is available before initializing the secondary GPU. This is done > by adding any non-active GPUs that try to initialize before switcheroo > is ready to a list and initializing these devices once switcheroo > becomes ready. This behavior is restricted to Apple laptops to prevent > causing problems on other machines. I hate this idea, no delaying stuff. We either need to have some sort of enforced ordering or make some stuff only work built-in. But sticking things on a delayed list just in case seems wrong to me. Dave. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
