<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - nouveau: Xorg crashes sooner or later in 3840x2160 mode" href="https://bugs.freedesktop.org/show_bug.cgi?id=93405#c15">Comment # 15</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - nouveau: Xorg crashes sooner or later in 3840x2160 mode" href="https://bugs.freedesktop.org/show_bug.cgi?id=93405">bug 93405</a> from <a class="email" href="mailto:imirkin@alum.mit.edu" title="Ilia Mirkin <imirkin@alum.mit.edu>"> Ilia Mirkin</a> <pre>I can't quite tell what you're trying to do, but here are a few pieces of information that you may find useful: HDMI cables can only carry a single TMDS link. (Not enough pins for more.) DVI cables can carry one or two TMDS links, each maxing at 165mhz (for a total of 330mhz for dual-link DVI). The maximum TMDS link speed nouveau will allow on HDMI connectors is 165MHz. With kernel 4.5 (or anything that includes <a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1a0c96c075bb4517d4ce4fb6750ee0a3cf38714c">https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1a0c96c075bb4517d4ce4fb6750ee0a3cf38714c</a> and a few of the surrounding commits), you will be able to override this by setting nouveau.hdmimhz=anything-you-want. We have no idea where to get the limits from, so we just set it to 165mhz for tesla and earlier 225mhz for fermi 297mhz for kepler+ We'll have to figure something out for HDMI 2.0 eventually. But again, this is all with the above commits; with kernel 4.4 it's just 165mhz for HDMI. Assuming your connector and cables support it, dual-link DVI will give you the highest maximum frequency.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>