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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
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<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Need one kernel option to enable all connected displays"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75552">75552</a>
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<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Assignee</th>
<td>jbarnes@virtuousgeek.org
</td>
</tr>
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<th>Summary</th>
<td>Need one kernel option to enable all connected displays
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Reporter</th>
<td>guang.a.yang@intel.com
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<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Component</th>
<td>DRM/Intel
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<th>Product</th>
<td>DRI
</td>
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<pre>commit eb1bfe807cb7b62a326fa20df5e3118a32c6f923
Author: Jesse Barnes <<a href="mailto:jbarnes@virtuousgeek.org">jbarnes@virtuousgeek.org</a>>
Date: Wed Feb 12 12:26:25 2014 -0800
drm/i915: allow re-use BIOS connector config for initial fbdev config v3
The BIOS or boot loader will generally create an initial display
configuration for us that includes some set of active pipes and
displays. This routine tries to figure out which pipes and connectors
are active and stuffs them into the crtcs and modes array given to us by
the drm_fb_helper code.
The overall sequence is:
intel_fbdev_init - from driver load
intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
drm_fb_helper_init - build fb helper structs
drm_fb_helper_single_add_all_connectors - more fb helper structs
intel_fbdev_initial_config - apply the config
drm_fb_helper_initial_config - call ->probe then register_framebuffer()
drm_setup_crtcs - build crtc config for fbdev
intel_fb_initial_config - find active connectors etc
drm_fb_helper_single_fb_probe - set up fbdev
intelfb_create - re-use or alloc fb, build out fbdev structs
v2: use BIOS connector config unconditionally if possible (Daniel)
check for crtc cloning and reject (Daniel)
fix up comments (Daniel)
v3: use command line args and preferred modes first (Ville)
Signed-off-by: Jesse Barnes <<a href="mailto:jbarnes@virtuousgeek.org">jbarnes@virtuousgeek.org</a>>
Tested-by: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>>
[danvet: Re-add the WARN_ON for a missing encoder crtc - the state
sanitizer should take care of this. And spell-ocd the comments.]
Signed-off-by: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
The kernel driver behavior changed with Jesse's patch above , the i915 driver
will try to keep the BIOS config instead of lighting up every port.
So need Jesse add one kernel option to enable all connected displays as before.</pre>
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