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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [KBL] Black screen with I915_FORMAT_MOD_Y_TILED_CCS (Requested display configuration exceeds system DDB limitations)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111995">111995</a>
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<th>Summary</th>
<td>[KBL] Black screen with I915_FORMAT_MOD_Y_TILED_CCS (Requested display configuration exceeds system DDB limitations)
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>not set
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<th>Priority</th>
<td>not set
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>contact@emersion.fr
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<p>
<div>
<pre>This is a bug report for a KBL machine. This issue can be reproduce on both
Sway [1] and Weston. The Sway issue contains a DRM dmesg excerpt.
User-space tries to enable a pipe with a 3840x2160 XRGB8888 buffer. The buffer
is created with gbm_surface_create_with_modifiers. The primary plane supports
I915_FORMAT_MOD_Y_TILED_CCS, it seems like that's what the driver is picking.
However when scanning out the buffer, the driver bails out with "Requested
display configuration exceeds system DDB limitations". This results in a black
screen.
My main question is: both Weston and wlroots except
gbm_surface_create_with_modifiers to pick a modifier so that the buffer can be
scanned out [2]. I wouldn't expect the driver to pick a modifier that doesn't
work.
If this isn't a driver bug, should user-space force LINEAR if the atomic commit
fails? Should it prune the modifier and retry with
gbm_surface_create_with_modifiers?
[1]: <a href="https://github.com/swaywm/wlroots/issues/1852">https://github.com/swaywm/wlroots/issues/1852</a>
[2]:
<a href="https://github.com/swaywm/wlroots/blob/480a31ea4e1a3aadbd053ee2a581cad5d4356876/backend/drm/renderer.c#L87">https://github.com/swaywm/wlroots/blob/480a31ea4e1a3aadbd053ee2a581cad5d4356876/backend/drm/renderer.c#L87</a></pre>
</div>
</p>
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