<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - 2560x1440 @144Hz graphic glitches and bad refresh rate" href="https://bugs.freedesktop.org/show_bug.cgi?id=93826#c67">Comment # 67</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - 2560x1440 @144Hz graphic glitches and bad refresh rate" href="https://bugs.freedesktop.org/show_bug.cgi?id=93826">bug 93826</a> from <a class="email" href="mailto:alexdeucher@gmail.com" title="Alex Deucher <alexdeucher@gmail.com>"> Alex Deucher</a> <pre>(In reply to iuno from <a href="show_bug.cgi?id=93826#c66">comment #66</a>) > (In reply to Alex Deucher from <a href="show_bug.cgi?id=93826#c65">comment #65</a>) > > > > Yes, that is independent of the patch in <a href="attachment.cgi?id=131983" name="attach_131983" title="possible fix">attachment 131983</a> <a href="attachment.cgi?id=131983&action=edit" title="possible fix">[details]</a> <a href='page.cgi?id=splinter.html&bug=93826&attachment=131983'>[review]</a> [review] > > [review]. The driver disables dynamic mclk switching for refresh rates > > above 120 hz to avoid flickering. > > Yes, I know it prevents flickering. <a href="show_bug.cgi?id=93826#c62">Comment #62</a> was a reply and I mentioned > this as *another* problem (high power draw), independent from the fixed one. > Do you get flickering at 144Hz without forcing the mclk to high? I.e., without these patches: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0a646f331db0eb9efc8d3a95a44872036d441d58">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0a646f331db0eb9efc8d3a95a44872036d441d58</a> <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=58d7e3e427db1bd68f33025519a9468140280a75">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=58d7e3e427db1bd68f33025519a9468140280a75</a> <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=09be4a5219610a6fae3215d4f51f948d6f5d2609">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=09be4a5219610a6fae3215d4f51f948d6f5d2609</a> <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2275a3a2fe9914ba6d76c8ea490da3c08342bd19">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2275a3a2fe9914ba6d76c8ea490da3c08342bd19</a> > Do you know how this works on Windows? Do they increase voltage without > raising clocks and could this be an option for amdgpu too? It's not the mclk frequency or voltage, it's the blanking period for the display timing, it's apparently too short on some monitors at very high refresh rates for the mclk to finish switching in time. If part of the mclk switch happens outside of the vblank period, you end up with flickering or other display artifacts.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>