In the meanwhile we're pushing out a change that just blanket allows 225MHz on Fermi and 297MHz on Kepler, with a kernel option override available. At least one GF106 user claims to have working 297MHz with proprietary drivers (and with nouveau in presence of the patches):
https://bugs.freedesktop.org/show_bug.cgi?id=91236 Having an accurate way to auto-detect this would be ideal though, as higher bandwidth monitors are becoming more ubiquitous. -ilia On Mon, Oct 26, 2015 at 1:35 PM, Ilia Mirkin <imir...@alum.mit.edu> wrote: > Hello, > > Various HDMI versions enable higher and higher pixel clocks. However > individual GPUs are not required to support the maximum pixel clock > supported by the spec in order to be compliant. It appears that some > GPUs max out at 225MHz while others at 297MHz (while others still, I > assume, are limited to 165MHz, esp among the older ones). > > We've been unable to find this in the VBIOS (I had a thought that it > was in the table pointed to by the 'T' table, but we have a > counterexample to that). Could you suggest a way to find this > information either from the VBIOS or based on the GPU? Are there > differences between regular HDMI and DP -> HDMI (passive)? > > This is becoming more and more relevant as 2560x1440/3840x2160 > displays are become more common, while (dual-link) DVI-D is on its way > out. > > Thanks, > > -ilia _______________________________________________ Nouveau mailing list Nouveau@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/nouveau
