Bug 43732 - [snb DP dongle] Blank screen after displayport re-hotplug on MBA4,1
Summary: [snb DP dongle] Blank screen after displayport re-hotplug on MBA4,1
Status: CLOSED WORKSFORME
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: DRI git
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2011-12-11 22:48 UTC by David.Cock
Modified: 2017-07-24 23:03 UTC (History)
5 users (show)

See Also:
i915 platform:
i915 features:

Attachments
dmesg output after triggering (123.04 KB, text/plain)
2011-12-11 22:48 UTC, David.Cock 		no flags Details
intel_reg_dumper output before (11.38 KB, text/plain)
2011-12-11 22:49 UTC, David.Cock 		no flags Details
intel_reg_dumper output after (11.38 KB, text/plain)
2011-12-11 22:50 UTC, David.Cock 		no flags Details
xorg log (30.93 KB, text/plain)
2011-12-11 22:50 UTC, David.Cock 		no flags Details
VBIOS dump before (64.00 KB, application/octet-stream)
2011-12-11 22:52 UTC, David.Cock 		no flags Details
VBIOS dump after (64.00 KB, application/octet-stream)
2011-12-11 22:53 UTC, David.Cock 		no flags Details
View All

Description David.Cock 2011-12-11 22:48:02 UTC 
Created attachment 54335 [details]
dmesg output after triggering

When an external monitor (DVI via. displayport and Apple DP->DVI dongle) is
disconnected, re-probing the connected displays fails and one is left with a
blank display on the laptop panel, which xrandr --auto fails to restore.  If
the X server is killed and restarted, displays are probed correctly and the
system is usable.

chipset:               Sandybridge mobile (GT2)
system architecture:   x86_64
software versions:
    xf86-video-intel = 2.17.0
    xorg             = 1.11.1.902 (1.11.2 RC 2)
    libdrm           = 2.4.27
    mesa             = 7.11-6
kernel version:        3.2.0-rc2i915drm-00143-ga767835
Linux distribution:    Debian (wheezy)
machine:               MacbookAir4,1 (mid-2011 11")
display connector:     Displayport (eDP1)

Steps to reproduce:
* Connect (via Displayport) and enable (xrandr --auto) external display.
* Disconnect Displayport connector.

Additional info:
Problem exists in Debian kernel 3.0.0-1-amd64 also.
Comment 1 David.Cock 2011-12-11 22:49:03 UTC 
Created attachment 54336 [details]
intel_reg_dumper output before
Comment 2 David.Cock 2011-12-11 22:50:07 UTC 
Created attachment 54337 [details]
intel_reg_dumper output after
Comment 3 David.Cock 2011-12-11 22:50:45 UTC 
Created attachment 54338 [details]
xorg log
Comment 4 David.Cock 2011-12-11 22:52:37 UTC 
Created attachment 54339 [details]
VBIOS dump before
Comment 5 David.Cock 2011-12-11 22:53:10 UTC 
Created attachment 54340 [details]
VBIOS dump after
Comment 6 Daniel Vetter 2013-03-20 11:45:00 UTC 
Shot in the dark: Can you please test the below patch? It should apply on top of drm-intel-nightly.

http://cgit.freedesktop.org/~danvet/drm/commit/?h=pll-limits-mess&id=64ac8695df0df5e9937da1b55ddb0e3fa37e6258
Comment 7 Jani Nikula 2013-09-12 08:35:40 UTC 
David, ping. Have you tried the latest kernels, and/or Daniel's patch?
Comment 8 David.Cock 2013-09-13 00:51:11 UTC 
Sorry, I'd forgotten about this bug report.  I can confirm that the problem is resolved in recent kernels.  Specifically, running 3.2.46-1+deb7u1 and xorg intel driver 1.12.3.902, hotplugging now works correctly.
Comment 9 Jani Nikula 2013-09-13 06:41:52 UTC 
(In reply to comment #8)
> Sorry, I'd forgotten about this bug report.

Well, uh, looks like we'd forgotten about it a few times too... Sorry.

> I can confirm that the problem
> is resolved in recent kernels.  Specifically, running 3.2.46-1+deb7u1 and
> xorg intel driver 1.12.3.902, hotplugging now works correctly.

Thanks for the confirmation.

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