[Bug 106250] Regression with Dell TB16 dock and Linux kernel 4.16.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106250

--- Comment #7 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
Minor update: looks like the watermarks go outside ddb_allocation, when
framebuffer is in Y_Tiled mode, first of all drm_framebuffer_init complains
with "no Y Tiling for legacy addfb", however it seems to continue using Y
Tiling when computing watermarks as wp->y_tiled is set to true, which leads it
to go outside ddb_allocation for resolution 3840x2560 used with eDP, which
leads to black screen.
I could fix it either by forcing X Tiling instead of Y Tiling or just by
assigning res_blocks to the current maximum ddb_allocation value.

Which way is correct here, I still have to understand.

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