[Bug 68643] [ILK/SNB/IVB/HSW DP] 1856x1392 and 1792x1344 modes can't light up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68643

--- Comment #19 from liulei <lei.a.liu at intel.com> ---
Notice that DMT v1.0 write:
+------------+----------------+----------+--------------+---------------+
| Pixel      |  Refresh Rate  |  DMT ID  |  STD         |    CVT        |
| Format     |                |  Codes   |2 Byte Codes  |3 Byte Codes   |
+------------+----------------+----------+--------------+---------------+
|1856 x 1392 |   60 Hz        |  41h     |   (C9, 40)h  |  n/a          |
+------------+----------------+----------+--------------+---------------+
|1792 x 1344 |   60 Hz        |   3Eh    |   (C1, 40)h  |   n/a         |
+------------+----------------+----------+--------------+---------------+

This two modes is n/a in CVT table. Does this have some influence on display?

I ever did a test as below steps:
1. cvt 1856 1392 60(I get 8 display timing)
2. replace 1856x1392 display timing in drm display mode table which is
   defined in drm_edid.c .
3. build kernel 
4. 1856x1392 mode can be lighted up with the kernel.
1792x1344 mode is the same.

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