Hi Kenneth, On Fri, 28 March 2014 Kenneth de Mello <[email protected]> wrote: > On my system, the maximum resolution of my monitor, 2560x1440, is no longer > automatically detected properly with kernel 3.13.7. This worked with > 3.13.6, and 5 with this hardware and identical kernel configs. Now the > autodetected resolution is 1920x1080. > > The monitor is plugged into the DVI port on my motherboard. > > My system: > > - i7-4770 (non-K) CPU > - asrock z87 extreme6 motherboard > - Dell U2711 monitor > > The integrated graphics adapter is configured as the primary in the BIOS, > and the discreet card is passed through to a Xen guest. Kernel 3.13.7 > mis-detects the resolution regardless if it is being booted with Xen or > without it (and previous versions worked as expected). More detailed > system information is attached. > > I don't notice any unusual messages, other than the wrong resolution. > > Steps to reproduce: Boot with kernel 3.13.7 (with or without Xen) > > I'd be happy to provide more detail if required.
This smells like the following change in 3.13.6 to 3.13.7 might be the cause: commit e3ea8fa6beaf55fee64bf816f3b8a80ad733b2c2 Author: Ville Syrjälä <[email protected]> Date: Mon Mar 3 11:33:36 2014 +0200 drm/i915: Reject >165MHz modes w/ DVI monitors commit 6375b768a9850b6154478993e5fb566fa4614a9c upstream. Single-link DVI max dotclock is 165MHz. Filter out modes with higher dotclock when the monitor doesn't support HDMI. Modes higher than 165 MHz were allowed in commit 7d148ef51a657fd04036c3ed7803da600dd0d451 Author: Daniel Vetter <[email protected]> Date: Mon Jul 22 18:02:39 2013 +0200 drm/i915: fix hdmi portclock limits Also don't attempt to use 12bpc mode with DVI monitors. Cc: Adam Nielsen <[email protected]> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75345 Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=70331 Tested-by: Ralf Jung <[email protected]> Signed-off-by: Ville Syrjälä <[email protected]> Signed-off-by: Jani Nikula <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> Bruno _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
