Bug 26743

Summary: EDID is not cleared in kernel when monitor disconnected
Product: DRI Reporter: Gordon Jin <gordon.jin>
Component: DRM/IntelAssignee: ykzhao <yakui.zhao>
Status: CLOSED FIXED QA Contact: fangxun <xunx.fang>
Severity: normal    
Priority: low CC: jbarnes
Version: unspecified   
Hardware: All   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
Xorg log none

Description Gordon Jin 2010-02-24 19:13:50 UTC 
With bug#14611 fixed, now we can start X without monitor connected. But this only works if monitor disconnected before kernel booting. 

If we disconnect monitor after kernel booting, the kernel still stores EDID info, and when start X, it considers EDID available so not accepting default modes, resulting no valid modes available and fail to start.
Comment 1 fangxun 2010-02-24 19:56:51 UTC 
Created attachment 33544 [details]
Xorg log
Comment 2 Gordon Jin 2010-03-03 18:38:17 UTC 
Setting kernel command line "video=VGA-1:e" works, though "video=VGA-1:1024x768" still doesn't.

With this workaround I don't think this bug impacts users much.
Comment 3 ykzhao 2010-03-15 00:47:07 UTC 
Now the corresponding patch is already picked up by Dave.
   >commit 725398322d05486109375fbb85c3404108881e17
Author: Zhao Yakui <yakui.zhao@intel.com>
Date:   Thu Mar 4 08:25:55 2010 +0000

    drm: remove the EDID blob stored in the EDID property when it is disconnected

So this bug will be marked as resolved.

Thanks.
Comment 4 fangxun 2010-04-12 01:47:24 UTC 
It works ok. Verified.
Comment 5 Elizabeth 2017-10-06 14:54:18 UTC 
Closing old verified.

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