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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Screen goes blank after boot, kernel 4.7 vs 4.6"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97060">97060</a>
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<th>Summary</th>
<td>Screen goes blank after boot, kernel 4.7 vs 4.6
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>XOrg git
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>alexey.shumitsky@gmail.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=125278" name="attach_125278" title="dmesg kernel 4.7-rc7">attachment 125278</a> <a href="attachment.cgi?id=125278&action=edit" title="dmesg kernel 4.7-rc7">[details]</a></span>
dmesg kernel 4.7-rc7
With kernel 4.7-rc7 (drm-intel-nightly) laptop screen (LVDS) goes blank after
inteldrmfb is loaded.
4.7.0-rc7+ #1 SMP Sat Jul 23 16:05:00 CEST 2016 x86_64 x86_64 x86_64 GNU/Linux
It appears to me the problem is with setting panel to wrong mode:
[ 2.737896] [drm:parse_lfp_panel_data] Found panel mode in BIOS VBT tables:
[ 2.737900] [drm:drm_mode_debug_printmodeline] Modeline 0:"1366x768" 0 76110
1366 1397 1462 1560 768 772 784 814 0x8 0xa
[ 2.737902] [drm:parse_lfp_panel_data] VBT initial LVDS value 300
While with previous kernel, 4.6, there was:
[ 4.684175] [drm:parse_lfp_panel_data] Found panel mode in BIOS VBT tables:
[ 4.684177] [drm:drm_mode_debug_printmodeline] Modeline 0:"1920x1080" 0
144200 1920 1968 2040 2116 1080 1083 1088 1137 0x8 0xa
[ 4.684178] [drm:parse_lfp_panel_data] VBT initial LVDS value 33c
My notebook uses fullhd panel, so resolution should be 1920x1080 clearly.
Full dmesg obtained with drm.debug=0xe is attached.</pre>
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