[Bug 58121] New: Radeon SUMO: LVDS panel blanks when enabling external monitor

[Bug 58121] New: Radeon SUMO: LVDS panel blanks when enabling external monitor

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=58121

           Summary: Radeon SUMO: LVDS panel blanks when enabling external
                    monitor
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.9
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: niels_ole@salscheider-online.de
        Regression: No


Created an attachment (id=101411)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=101411)
dmesg with drm.debug=4

When I enable both my LVDS panel and an external monitor (e.g. DP or VGA), my
LVDS panel blanks.
This is on a radeon SUMO GPU (AMD A6-3410MX APU).
I have attached the dmesg output with drm.debug=4 and my Xorg.0.log.

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[Bug 58121] Radeon SUMO: LVDS panel blanks when enabling external monitor

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https://bugzilla.kernel.org/show_bug.cgi?id=58121





--- Comment #1 from Niels Ole Salscheider <niels_ole@salscheider-online.de>  2013-05-14 10:23:54 ---
Created an attachment (id=101421)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=101421)
Xorg.0.log

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[Bug 58121] Radeon SUMO: LVDS panel blanks when enabling external monitor

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=58121


Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com




--- Comment #2 from Alex Deucher <alexdeucher@gmail.com>  2013-05-14 12:42:31 ---
Is this a regression?

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[Bug 58121] Radeon SUMO: LVDS panel blanks when enabling external monitor

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https://bugzilla.kernel.org/show_bug.cgi?id=58121





--- Comment #3 from Niels Ole Salscheider <niels_ole@salscheider-online.de>  2013-05-14 20:22:53 ---
I thought so at first since I believe that I tested multihead after
implementing 0a9069d34918659bc8a89e21e69e60b2b83291a3.

But now it does not work with older kernel versions, either.

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[Bug 58121] Radeon SUMO: LVDS panel blanks when enabling external monitor

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=58121

黄家垚 <huangjiayao_1992@163.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |huangjiayao_1992@163.com

--- Comment #4 from 黄家垚 <huangjiayao_1992@163.com> ---
This also appeared on my laptop(A6 3400M and A8 3500M) with Linux 3.5.0 to
3.11. For using external monitor, i can only use Linux 3.4.x. I an looking
forward to use newer Linux kernel on my laptop.

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[Bug 58121] Radeon SUMO: LVDS panel blanks when enabling external monitor

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=58121

Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alan@lxorguk.ukuu.org.uk
     Kernel Version|3.9                         |3.11

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[Bug 58121] Radeon SUMO: LVDS panel blanks when enabling external monitor

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https://bugzilla.kernel.org/show_bug.cgi?id=58121

--- Comment #5 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to 黄家垚 from comment #4)
> This also appeared on my laptop(A6 3400M and A8 3500M) with Linux 3.5.0 to
> 3.11. For using external monitor, i can only use Linux 3.4.x. I an looking
> forward to use newer Linux kernel on my laptop.

Can you bisect?

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[Bug 58121] Radeon SUMO: LVDS panel blanks when enabling external monitor

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=58121

Niels Ole Salscheider <niels_ole@salscheider-online.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |niels_ole@salscheider-onlin
                   |                            |e.de

--- Comment #6 from Niels Ole Salscheider <niels_ole@salscheider-online.de> ---
Created attachment 127381
  --> https://bugzilla.kernel.org/attachment.cgi?id=127381&action=edit
Possible fix

I tried a current git checkout and noticed that now only DisplayPort monitors
cause the problem - VGA works fine.
After debugging the issue a bit further I noticed that the problem seems to be
caused by a shared PLL between the bridge chip and the DP monitor.

The attached patch fixes the issue for me but I am not sure if we must not
share PLLs at all or just not with the bridge chip.

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[Bug 58121] Radeon SUMO: LVDS panel blanks when enabling external monitor

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https://bugzilla.kernel.org/show_bug.cgi?id=58121

Niels Ole Salscheider <niels_ole@salscheider-online.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|3.11                        |3.14

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[Bug 58121] Radeon SUMO: LVDS panel blanks when enabling external monitor

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https://bugzilla.kernel.org/show_bug.cgi?id=58121

--- Comment #7 from Alex Deucher <alexdeucher@gmail.com> ---
Created attachment 127441
  --> https://bugzilla.kernel.org/attachment.cgi?id=127441&action=edit
updated version of the patch

The patch looks good.  We already disable PLL sharing for non-DP displays, so
we should also disable it for DP displays as well.  DCE4.1 only supports 2
displays anyway so sharing doesn't really buy us much.  I updated the patch
slightly to make the logic a little cleaner.  I'll add it to my -fixes queue.

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