Hi Kenneth,
On Fri, 28 March 2014 Kenneth de Mello <kdemello1980@xxxxxxxxx> 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 <ville.syrjala@xxxxxxxxxxxxxxx>
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 <daniel.vetter@xxxxxxxx>
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 <a.nielsen@xxxxxxxxxxx>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75345
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=70331
Tested-by: Ralf Jung <post+kernel@xxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Bruno
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