[Bug 109477] [regression, bisected] [i915] setting initial watermarks on gen 7 IVYBRIDGE causes blank lines on monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109477

--- Comment #14 from Andrea <andreatclist at gmail.com> ---
(In reply to Ville Syrjala from comment #12)
> Created attachment 143441 [details] [review]
> [PATCH] drm/i915: Disable LP1+ watermarks on Lenovo Thinkpad T431s
> 
> This patch should disable LP1+ watermarks on the affected machine
> automagically. Please test and also attach the output of intel_watermarks
> when using the patch so that I can double check that everything looks
> correct.

More info: your patch applied on top of the reverted d179b88deb also fixes the
issue.

> $ git log --oneline
> drm/i915: Disable LP1+ watermarks on Lenovo Thinkpad T431s
> Revert "drm/i915/fbdev: Actually configure untiled displays"

intel_watermarks: (good)
    WM_PIPE_A = 0x000b0000
    WM_PIPE_B = 0x00000000
    WM_PIPE_C = 0x00000000
       WM_LP1 = 0x00000000
       WM_LP2 = 0x00000000
       WM_LP3 = 0x00000000
   WM_LP1_SPR = 0x00000000
   WM_LP2_SPR = 0x00000000
   WM_LP3_SPR = 0x00000000
      ARB_CTL = 0xd6663056
     ARB_CTL2 = 0x00000000
WM_PIPE_A: primary=11, cursor=0, sprite=0
WM_PIPE_B: primary=0, cursor=0, sprite=0
WM_PIPE_C: primary=0, cursor=0, sprite=0
WM_LP1: disabled, latency=0, fbc=0, primary=0, cursor=0, sprite=0
WM_LP2: disabled, latency=0, fbc=0, primary=0, cursor=0, sprite=0
WM_LP3: disabled, latency=0, fbc=0, primary=0, cursor=0, sprite=0
Primary A trickle feed = disabled
Sprite A trickle feed = enabled
Primary B trickle feed = disabled
Sprite B trickle feed = enabled
Primary C trickle feed = disabled
Sprite C trickle feed = enabled
DDB partitioning = 1/2
FBC watermark = enabled

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