On 15 May 2014 18:58, Jani Nikula <jani.nikula@xxxxxxxxx> wrote: > On Wed, 14 May 2014, Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> wrote: >> We do have to continue the investigation on the link training side, but >> since 76711 is a critical I'm completely in favor of this workaround for >> now. >> >> I just tested and it worked very well here, so: >> >> Tested-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> >> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> > > Pushed to -fixes, thanks for the review and testing. > > BR, > Jani. > >> >> >> On Wed, May 14, 2014 at 6:02 AM, Jani Nikula <jani.nikula@xxxxxxxxx> wrote: >> >>> There are certain BDW high res eDP machines that regressed due to >>> >>> commit 38aecea0ccbb909d635619cba22f1891e589b434 >>> Author: Daniel Vetter <daniel.vetter@xxxxxxxx> >>> Date: Mon Mar 3 11:18:10 2014 +0100 >>> >>> drm/i915: reverse dp link param selection, prefer fast over wide again >>> >>> The commit lead to 2 lanes at 5.4 Gbps being used instead of 4 lanes at >>> 2.7 Gbps on the affected machines. Link training succeeded for both, but >>> the screen remained blank with the former config. Further investigation >>> showed that 4 lanes at 5.4 Gbps worked also. >>> >>> The root cause for the blank screen using 2 lanes remains unknown, but >>> apparently the driver for a certain other operating system by default >>> uses the max available lanes. Follow suit on Broadwell eDP, for at least >>> until we figure out what is going on. Uggh, okay this lane thing is such a pita, On haswell the Lenovo dock in SST mode is broken by the original patch as well. I'm not sure we want to do IS_HASWELL here as well, I think we need to revert 38aecea0ccbb909d635619cba22f1891e589b434 Dave. _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
