[Bug 39882] New: Regression: Plugging in a HDMI connector makes the LCD of X120e go dark

[Bug 39882] New: Regression: Plugging in a HDMI connector makes the LCD of X120e go dark

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=39882

           Summary: Regression: Plugging in a HDMI connector makes the LCD
                    of X120e go dark
           Product: DRI
           Version: XOrg CVS
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: gottfried.haider@gmail.com


When I plug in my external TFT monitor while my X120e is in use, the laptop's
internal LCD immediately goes dark - yet I don't have a picture on the TFT.

I first noticed this with kernel 3.0.0, this is fully reproducible also on
3.0.1. Since I did not remember this happening before, I tested with an older
kernel (Ubuntu's 2.6.38, but should not make a difference), and indeed: with
2.6.38 the internal LCD stays on (which is the expected behavior).

The TFT is connected via a HDMI-to-DVI cable. Userspace is Xubuntu 11.04 with
xorg-edgers PPA.

At a first glance, I do not see anything interesting in either dmesg or
Xorg.log when this happens. Note: the machine does not hang, since I can still
(blindly) launch a terminal and make the machine restart - for which I briefly
get a picture on the LCD again after XOrg shutdown.

I am attaching lspci and a dmesg/Xorg.log below - please let me know if I can
help with anything else (I can easily test kernel patches).

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[Bug 39882] Regression: Plugging in a HDMI connector makes the LCD of X120e go dark

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https://bugs.freedesktop.org/show_bug.cgi?id=39882

--- Comment #1 from gottfried.haider@gmail.com 2011-08-06 06:28:25 PDT ---
Created an attachment (id=49992)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=49992)
lspci of Lenovo X120e

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[Bug 39882] Regression: Plugging in a HDMI connector makes the LCD of X120e go dark

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https://bugs.freedesktop.org/show_bug.cgi?id=39882

--- Comment #2 from gottfried.haider@gmail.com 2011-08-06 06:31:57 PDT ---
Created an attachment (id=49993)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=49993)
dmesg (nothing interesting after HDMI insertion)

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[Bug 39882] Regression: Plugging in a HDMI connector makes the LCD of X120e go dark

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https://bugs.freedesktop.org/show_bug.cgi?id=39882

--- Comment #3 from gottfried.haider@gmail.com 2011-08-06 06:33:29 PDT ---
Created an attachment (id=49994)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=49994)
Xorg.log (HDMI insertion happened just before 906.688)

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[Bug 39882] Regression: Plugging in a HDMI connector makes the LCD of X120e go dark

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https://bugs.freedesktop.org/show_bug.cgi?id=39882

--- Comment #4 from Alex Deucher <agd5f@yahoo.com> 2011-08-06 07:27:46 PDT ---
Can you bisect?  If I had to guess, it's probably one of the display rework
patches added in 3.0.  Does a VT switch help?

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[Bug 39882] Regression: Plugging in a HDMI connector makes the LCD of X120e go dark

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https://bugs.freedesktop.org/show_bug.cgi?id=39882

--- Comment #5 from gottfried.haider@gmail.com 2011-08-06 12:26:19 PDT ---
Sorry, I tried bisecting, but defconfig does not boot here.. and my normal
config takes ages for a full rebuild.

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[Bug 39882] Regression: Plugging in a HDMI connector makes the LCD of X120e go dark

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https://bugs.freedesktop.org/show_bug.cgi?id=39882

--- Comment #6 from gottfried.haider@gmail.com 2011-08-10 17:03:12 PDT ---
Regarding VT switching: When I press Ctrl+Alt+F1 after plugging in I do get a
picture again on the internal LCD.. when I then press Ctrl+Alt+F7 I am even
properly back in X.

Thanks

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[Bug 39882] Regression: Plugging in a HDMI connector makes the LCD of X120e go dark

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--- Comment #7 from Alex Deucher <agd5f@yahoo.com> 2011-08-12 14:45:34 PDT ---
It's a bad interaction between modesetting and hotplug.  I'm working on a
patch.

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[Bug 39882] Regression: Plugging in a HDMI connector makes the LCD of X120e go dark

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--- Comment #8 from Alex Deucher <agd5f@yahoo.com> 2011-08-13 10:28:00 PDT ---
Created an attachment (id=50185)
 View: https://bugs.freedesktop.org/attachment.cgi?id=50185
 Review: https://bugs.freedesktop.org/review?bug=39882&attachment=50185

fix

This patch fixes the issue.

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[Bug 39882] Regression: Plugging in a HDMI connector makes the LCD of X120e go dark

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Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #9 from Alex Deucher <agd5f@yahoo.com> 2011-08-17 11:21:36 PDT ---
The patch works for me.  If you still have issues, please reopen.

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[Bug 39882] Regression: Plugging in a HDMI connector makes the LCD of X120e go dark

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https://bugs.freedesktop.org/show_bug.cgi?id=39882

--- Comment #10 from gottfried.haider@gmail.com 2011-08-19 18:31:55 PDT ---
Sorry that it took a bit long, but I confirm this as being fixed. (Thanks!)

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[Bug 39882] Regression: Plugging in a HDMI connector makes the LCD of X120e go dark

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https://bugs.freedesktop.org/show_bug.cgi?id=39882

--- Comment #11 from Florian Mickler <florian@mickler.org> 2011-08-23 13:18:55 PDT ---
A patch referencing this bug report has been merged in Linux v3.1-rc3:

commit d5811e8731213f80c80d89e980505052f16aca1c
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Sat Aug 13 13:36:13 2011 -0400

    drm/radeon/kms: don't try to be smart in the hpd handler

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