On Thu, Oct 02, 2014 at 01:30:48PM +1000, Dave Airlie wrote: > Hey guys, > > so I have a haswell ULT laptop (lenovo t440s), and got access to a > Samsung single panel 4k monitor (no MST). > > Now we detect the monitor fine, but unfortunately the ULT hsw can't > run it over DP, as it has clock limits in place. However we still > offer the 60hz mode and we pick it by default, ensuing black screens. > > I've tested the same monitor with a haswell in a t540p and it works > fine due to having the higher limits in place. We have the IS_HSW_ULX check in intel_dp_max_link_bw, and that's used by both compute_config and mode_valid. So it should work, and from a quick look I don't see any bugs. But obviously something is busted. Can you please printk-augment intel_dp_mode_valid and check what's going wrong there? Thanks, Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
