[Bug 94087] eDP panel exhibits sparse random noise and flickering (link issue), forcing DP DDI profile helps [Lenovo T450s]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94087

--- Comment #9 from Alexander Schremmer <alex at alexanderweb.de> ---
Mika, you computed offset 0xcc for block 27. Those 8 bytes are all 0x11. And
they are the same in my VBT and the VBT of a much older BIOS version (gathered
from a friend of mine).

Thus, I am inclined to say that block 27 is a red herring: at least the
low_swing setting did not change between those versions. Nevertheless, nobody
on the interwebz seems to have exactly my eDP issues with a T450 or T450s.

The only diffs between the old and new VBT are:

In Block 27:
-       00e0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
+       00e0: 34 08 00 00 00 00 00 00  00 00 00 00 00 00 00 00

In Block 42:
-*      panel type 02: 1920x1080 clock 138700000
+*      panel type 02: 1920x1080 clock 141000000
                info:
-                 LVDS: 0x0020033c
+                 LVDS: 0x0030033c
                  PP_ON_DELAYS: 0x025807d0
                  PP_OFF_DELAYS: 0x01f407d0
                  PP_DIVISOR: 0x00270f05
-                 PFIT: 0x3870a080
-               timings: 1920 1968 2000 2080 1080 1083 1088 1111 138700.00
(good)
+                 PFIT: 0x3870b880
+               timings: 1920 1936 1952 2104 1080 1083 1097 1116 141000.00
(good)

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