On Tue, Nov 11, 2014 at 12:19 PM, Rian Quinn <rianquinn@xxxxxxxxx> wrote: > What exactly is the correct way to support cloned monitors using LibDRM. As > I see it, there are two methods: > > - Use the connector array in drmModeSetCrtc > - Use one crtc per connector, but share the same framebuffer. > > Right now I am using option #2 as it seems to be the most flexible, but my > current issue is that on laptops, the connector for the laptop's main screen > is only retuning 1 mode (tested on a Lenovo, and an HP folio), which means > that your unlikely to find a common mode between the laptop monitor, and an > external screen (monitor or projector). #2 is the method that will work on all hw.. usually DE's will pick the closest matching modes between the two connectors/outputs, and truncate edges on the smaller display (via non-zero x/y offset). Some hw may support upscaling to fit, although that isn't really exposed in a completely standard way at the moment. BR, -R > So with the above problem, right now the only thing that I know to do would > be to set the resolution of the laptop monitor and external monitor to be > their "preferred" resolution, and then copy and scale for "cloned mode" > which seems like a terrible idea considering the laptop monitor should be > able to set itself to some more basic resolutions (like 800x600). > > - Rian > > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/dri-devel > _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
