[Bug 81895] [HSW/BDW Bisected SST/MST] 4k resolution cannot be found when connected by MST (but is shown for SST)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81895

--- Comment #12 from liulei <lei.a.liu at intel.com> ---
Latest -nightly kernel() is able to find 4K resolution.
[root at x-bdw01 tests]# uname -a
Linux x-bdw01 3.17.0-rc1_drm-intel-nightly_49cedd_20140821+ #1652 SMP Thu Aug
21 1
[root at x-bdw01 tests]# ./testdisplay -i
Connectors:
id      encoder status          type    size (mm)       modes
19      18      connected       eDP     280x160         1
  modes:
  name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot flags type clock
[0]  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
27      26      connected       DP      700x390         32
  modes:
  name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot flags type clock
[0]  3840x2160 30 3840 3888 3920 4000 2160 2163 2168 2191 0x9 0x48 262750
[1]  3840x2160 30 3840 4016 4104 4400 2160 2168 2178 2250 0x5 0x40 300000
[2]  1920x1200 60 1920 2056 2256 2592 1200 1203 1209 1245 0x6 0x40 193250
[3]  1920x1080 60 1920 2008 2052 2200 1080 1082 1087 1125 0x5 0x40 148500
[4]  1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 0x5 0x40 148500
[5]  1920x1080 60 1920 2008 2052 2200 1080 1084 1089 1125 0x5 0x40 148352
[6]  1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 0x15 0x40 74250
[7]  1920x1080i 60 1920 2008 2052 2200 1080 1084 1094 1125 0x15 0x40 74176
[8]  1920x1080 50 1920 2448 2492 2640 1080 1084 1089 1125 0x5 0x40 148500
[9]  1920x1080i 50 1920 2448 2492 2640 1080 1084 1094 1125 0x15 0x40 74250
[10]  1920x1080 24 1920 2558 2602 2750 1080 1084 1089 1125 0x5 0x40 74250
[11]  1920x1080 24 1920 2558 2602 2750 1080 1084 1089 1125 0x5 0x40 74176
[12]  1600x1200 60 1600 1664 1856 2160 1200 1201 1204 1250 0x5 0x40 162000
[13]  1680x1050 60 1680 1784 1960 2240 1050 1053 1059 1089 0x6 0x40 146250
[14]  1280x1024 75 1280 1296 1440 1688 1024 1025 1028 1066 0x5 0x40 135000
[15]  1280x1024 60 1280 1328 1440 1688 1024 1025 1028 1066 0x5 0x40 108000
[16]  1280x800 60 1280 1352 1480 1680 800 803 809 831 0x9 0x40 83500
[17]  1152x864 75 1152 1216 1344 1600 864 865 868 900 0x5 0x40 108000
[18]  1280x720 60 1280 1390 1430 1650 720 725 730 750 0x5 0x40 74250
[19]  1280x720 60 1280 1390 1430 1650 720 725 730 750 0x5 0x40 74176
[20]  1280x720 50 1280 1720 1760 1980 720 725 730 750 0x5 0x40 74250
[21]  1024x768 75 1024 1040 1136 1312 768 769 772 800 0x5 0x40 78800
[22]  1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
[23]  800x600 75 800 816 896 1056 600 601 604 625 0x5 0x40 49500
[24]  800x600 60 800 840 968 1056 600 601 605 628 0x5 0x40 40000
[25]  720x576 50 720 732 796 864 576 581 586 625 0xa 0x40 27000
[26]  720x480 60 720 736 798 858 480 489 495 525 0xa 0x40 27027
[27]  720x480 60 720 736 798 858 480 489 495 525 0xa 0x40 27000
[28]  640x480 75 640 656 720 840 480 481 484 500 0xa 0x40 31500
[29]  640x480 60 640 656 752 800 480 490 492 525 0xa 0x40 25200
[30]  640x480 60 640 656 752 800 480 490 492 525 0xa 0x40 25175
[31]  720x400 70 720 738 846 900 400 412 414 449 0x6 0x40 28320
31      0       disconnected    HDMI-A  0x0             0
34      0       disconnected    HDMI-A  0x0             0

CRTCs:
id      fb      pos     size
7       60      (0,0)   (1920x1080)
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
12      60      (0,0)   (3840x2160)
  3840x2160 30 3840 3888 3920 4000 2160 2163 2168 2191 0x9 0x48 262750
16      0       (0,0)   (0x0)
   0 0 0 0 0 0 0 0 0 0x0 0x0 0

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