[Bug 58791] [ILK] Some modes can't light up on DP display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58791

--- Comment #1 from yanbing <bingx.a.yan at intel.com> ---
New more modes can not light up on this commit.

Environment:
-------------------------
Kernel: (drm-intel-next-queued)fa22c28522f53b63c1b287da1b69dc5700eaa09f
Some additional commit info:
Author: Ben Widawsky <ben at bwidawsk.net>
Date:   Fri Jan 18 19:18:19 2013 -0800

    drm/i915: re-add dropped dma_mask configuration

Description:
-------------------------
Testing these modes below, monitor can't light up.:

CRTS(3):[0]  1920x1080 50 1920 2448 2492 2640 1080 1084 1089 1125 0x5 0x40
148500
CRTS(3):[0]  1600x1200 60 1600 1664 1856 2160 1200 1201 1204 1250 0x5 0x40
162000
CRTS(3):[0]  1400x1050 60 1400 1488 1632 1864 1050 1053 1057 1089 0x6 0x40
121750
CRTS(3):[0]  1440x900 75 1440 1536 1688 1936 900 903 909 942 0x6 0x40 136750

Testing these modes below, monitor can light up be in a certain probability,and
after light up it also be a bug in bug 54687:

CRTS(3):[0]  1920x1080i 50 1920 2448 2492 2640 1080 1084 1094 1125 0x15 0x40
74250
CRTS(3):[0]  1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 0x15 0x40
74250

I also add the dmesg called modes-cannot-lightup.dmesg

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