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<body><span class="vcard"><a class="email" href="mailto:andreatclist@gmail.com" title="Andrea <andreatclist@gmail.com>"> <span class="fn">Andrea</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - [regression, bisected] [i915] setting initial watermarks on gen 7 IVYBRIDGE causes blank lines on monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109477">bug 109477</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEEDINFO
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<td>NEW
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [regression, bisected] [i915] setting initial watermarks on gen 7 IVYBRIDGE causes blank lines on monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109477#c13">Comment # 13</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [regression, bisected] [i915] setting initial watermarks on gen 7 IVYBRIDGE causes blank lines on monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109477">bug 109477</a>
from <span class="vcard"><a class="email" href="mailto:andreatclist@gmail.com" title="Andrea <andreatclist@gmail.com>"> <span class="fn">Andrea</span></a>
</span></b>
<pre>(In reply to Ville Syrjala from <a href="show_bug.cgi?id=109477#c12">comment #12</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=143441" name="attach_143441" title="[PATCH] drm/i915: Disable LP1+ watermarks on Lenovo Thinkpad T431s">attachment 143441</a> <a href="attachment.cgi?id=143441&action=edit" title="[PATCH] drm/i915: Disable LP1+ watermarks on Lenovo Thinkpad T431s">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=109477&attachment=143441'>[review]</a> [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.</span >
I checked out the last drm-tip to apply the patch, but drm-tip doesn't show the
problem anymore.
The drm-tip I used:
commit 348fd7b7fa6584957fa6a5143058b3fbb319806b
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Fri Mar 1 18:32:47 2019 +0000
drm-tip: 2019y-03m-01d-18h-31m-34s UTC integration manifest
The commit that seems to fix the issue is:
"drm/i915/fbdev: Actually configure untiled displays"
d179b88deb3bf6fed4991a31fd6f0f2cad21fab5
Reverting it makes the problem appear again.
intel_watermark with d179b88deb3bf6fed4991a31fd6f0f2cad21fab5 (good):
WM_PIPE_A = 0x000b0000
WM_PIPE_B = 0x00000000
WM_PIPE_C = 0x00000000
WM_LP1 = 0x84301100
WM_LP2 = 0x90303c00
WM_LP3 = 0xa0406600
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: enabled, latency=4, fbc=3, primary=17, cursor=0, sprite=0
WM_LP2: enabled, latency=16, fbc=3, primary=60, cursor=0, sprite=0
WM_LP3: enabled, latency=32, fbc=4, primary=102, 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 = enabled
Sprite C trickle feed = enabled
DDB partitioning = 1/2
FBC watermark = enabled
intel_watermark without d179b88deb3bf6fed4991a31fd6f0f2cad21fab5 (bad):
WM_PIPE_A = 0x000b0000
WM_PIPE_B = 0x00000000
WM_PIPE_C = 0x00000000
WM_LP1 = 0x84301100
WM_LP2 = 0x90303c00
WM_LP3 = 0xa0406600
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: enabled, latency=4, fbc=3, primary=17, cursor=0, sprite=0
WM_LP2: enabled, latency=16, fbc=3, primary=60, cursor=0, sprite=0
WM_LP3: enabled, latency=32, fbc=4, primary=102, 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
Primary C trickle feed is different.</pre>
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