<div dir="ltr">Bruno,<div><br></div><div>Thank you for your reply.</div><div><br></div><div>What about dual-link DVI? I though the additional link addressed the pixel clock limitation. Has it only been using a single link this entire time, and it's only worked by ignoring the maximum dotclock, so in other words, the fact it works at all is the bug?</div>
<div><br></div><div>Also, the commit that rejects mode exceeding 165MHz states:</div><div><br></div><div> "Single-link DVI max dotclock is 165MHz. Filter out modes with higher</div> dotclock when the monitor doesn't support HDMI."<div>
<br></div><div>Does this mean HDMI in general? This monitor does support HDMI, but the maximum resolution when using the physical HDMI ports is 1920x1080. </div><div><br></div><div>What is the solution here, to switch to displayport if I want to use kernel 3.13.7 and beyond? (This is fine, I just need to know so I can buy the cable).</div>
<div><div class="gmail_extra"><br>Kenneth<br><br><div class="gmail_quote">On Sun, Mar 30, 2014 at 2:36 PM, Bruno Prémont <span dir="ltr"><<a href="mailto:bonbons@linux-vserver.org" target="_blank">bonbons@linux-vserver.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">Hi Kenneth,<br>
<br>
On Fri, 28 March 2014 Kenneth de Mello <<a href="mailto:kdemello1980@gmail.com">kdemello1980@gmail.com</a>> wrote:<br>
> On my system, the maximum resolution of my monitor, 2560x1440, is no longer<br>
> automatically detected properly with kernel 3.13.7. This worked with<br>
> 3.13.6, and 5 with this hardware and identical kernel configs. Now the<br>
> autodetected resolution is 1920x1080.<br>
><br>
> The monitor is plugged into the DVI port on my motherboard.<br>
><br>
> My system:<br>
><br>
> - i7-4770 (non-K) CPU<br>
> - asrock z87 extreme6 motherboard<br>
> - Dell U2711 monitor<br>
><br>
> The integrated graphics adapter is configured as the primary in the BIOS,<br>
> and the discreet card is passed through to a Xen guest. Kernel 3.13.7<br>
> mis-detects the resolution regardless if it is being booted with Xen or<br>
> without it (and previous versions worked as expected). More detailed<br>
> system information is attached.<br>
><br>
> I don't notice any unusual messages, other than the wrong resolution.<br>
><br>
> Steps to reproduce: Boot with kernel 3.13.7 (with or without Xen)<br>
><br>
> I'd be happy to provide more detail if required.<br>
<br>
This smells like the following change in 3.13.6 to 3.13.7 might<br>
be the cause:<br>
<br>
commit e3ea8fa6beaf55fee64bf816f3b8a80ad733b2c2<br>
Author: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>><br>
Date: Mon Mar 3 11:33:36 2014 +0200<br>
<br>
drm/i915: Reject >165MHz modes w/ DVI monitors<br>
<br>
commit 6375b768a9850b6154478993e5fb566fa4614a9c upstream.<br>
<br>
Single-link DVI max dotclock is 165MHz. Filter out modes with higher<br>
dotclock when the monitor doesn't support HDMI.<br>
<br>
Modes higher than 165 MHz were allowed in<br>
<br>
commit 7d148ef51a657fd04036c3ed7803da600dd0d451<br>
Author: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>><br>
Date: Mon Jul 22 18:02:39 2013 +0200<br>
<br>
drm/i915: fix hdmi portclock limits<br>
<br>
Also don't attempt to use 12bpc mode with DVI monitors.<br>
<br>
Cc: Adam Nielsen <<a href="mailto:a.nielsen@shikadi.net">a.nielsen@shikadi.net</a>><br>
Bugzilla: <a href="https://bugs.freedesktop.org/show_bug.cgi?id=75345" target="_blank">https://bugs.freedesktop.org/show_bug.cgi?id=75345</a><br>
Bugzilla: <a href="https://bugzilla.kernel.org/show_bug.cgi?id=70331" target="_blank">https://bugzilla.kernel.org/show_bug.cgi?id=70331</a><br>
Tested-by: Ralf Jung <<a href="mailto:post%2Bkernel@ralfj.de">post+kernel@ralfj.de</a>><br>
Signed-off-by: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>><br>
Signed-off-by: Jani Nikula <<a href="mailto:jani.nikula@intel.com">jani.nikula@intel.com</a>><br>
Signed-off-by: Greg Kroah-Hartman <<a href="mailto:gregkh@linuxfoundation.org">gregkh@linuxfoundation.org</a>><br>
<span class=""><font color="#888888"><br>
<br>
Bruno<br>
</font></span></blockquote></div><br></div></div></div>