[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

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https://bugs.freedesktop.org/show_bug.cgi?id=99784

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Driver/Radeon               |DRM/Radeon
            Product|xorg                        |DRI
         QA Contact|xorg-team@lists.x.org       |
           Assignee|xorg-driver-ati@lists.x.org |dri-devel@lists.freedesktop
                   |                            |.org
            Version|7.7 (2012.06)               |unspecified

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[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

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https://bugs.freedesktop.org/show_bug.cgi?id=99784

--- Comment #6 from lazanet96@gmail.com ---
Problem persists with DRM 2.49.0 / 4.10.1-041001-lowlatency, LLVM 3.9.1

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[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

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https://bugs.freedesktop.org/show_bug.cgi?id=99784

--- Comment #7 from lazanet96@gmail.com ---
Problem persists with kernel 4.11.rc4. I also made imgur post with relevant
screenshots and explanations http://imgur.com/a/3kwiq

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[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

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https://bugs.freedesktop.org/show_bug.cgi?id=99784

--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
I wonder if at least some of the issues could be related to the internal
panel's horizontal resolution of 1366... Does setting a lower resolution on the
internal panel make any difference?

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[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

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https://bugs.freedesktop.org/show_bug.cgi?id=99784

--- Comment #9 from lazanet96@gmail.com ---
I changed resolution to 1280x768, and it disabled both internal monitor and
VGA. After message box timed out and reverted resolution to 1366x768, VGA is
now off and HDMI and internal are on.

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[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

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https://bugs.freedesktop.org/show_bug.cgi?id=99784

--- Comment #10 from lazanet96@gmail.com ---
Created attachment 130604
  --> https://bugs.freedesktop.org/attachment.cgi?id=130604&action=edit
xrandr outputs for radeon and fglrx

Also there are a lot differences in xrandr outputs for fglrx and radeon, maybe
timings are off too?

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[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

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https://bugs.freedesktop.org/show_bug.cgi?id=99784

--- Comment #11 from lazanet96@gmail.com ---
Problem persists with 4.11rc7 kernel. Should I try updating some other package?

Also, I noticed that problem starts before X is active (at grub/systemd/ubuntu
splash logo). With fglrx only internal monitor would display image at that time
- until lightdm and X start (when all three monitors would turn on). Using
radeon drivers/drm however, external monitors would display mirrored systemd
log/splash screen and internal monitor is off right after grub menu.

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[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

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https://bugs.freedesktop.org/show_bug.cgi?id=99784

--- Comment #12 from lazanet96@gmail.com ---
Problem persists with Ubuntu 17.10 / DRM 2.49.0 / 4.11.0-041100rc8-lowlatency,
LLVM 4.0.0

Tested all resolution options for all three of the monitors, and has been able
to output either on HDMI and VGA or HDMI and LVDS (internal). I have no idea
what else could I test (or which code could I look at). Would setting drm.debug
flag  to 0x4 in GRUB provide some more relevant data?  

Also, I have found this forum thread about the same issue, which dates from
2013: https://ubuntuforums.org/showthread.php?t=2194601

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[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

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https://bugs.freedesktop.org/show_bug.cgi?id=99784

--- Comment #13 from lazanet96@gmail.com ---
4.12.rc1 kernel (from http://kernel.ubuntu.com/~kernel-ppa/mainline/) crashes
at boot during DRM loading phase, just after internal display turns off.
http://imgur.com/a/VBKv4

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[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

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https://bugs.freedesktop.org/show_bug.cgi?id=99784

--- Comment #14 from Valeriu Balaban <vbalaban@usc.edu> ---
Created attachment 131429
  --> https://bugs.freedesktop.org/attachment.cgi?id=131429&action=edit
Output of xrandr and dmesg

I have the same issue on Ubuntu 16.04 LTS with Mate desktop that runs on an
iMac 11. The second monitor is connected through a Display Port to VGA adapter
and the kernel selects it to be primary by default. 

After a fresh boot, since the second monitor is the primary one it contains the
login screen, however the screen is black. So I have to unplug it to make the
internal monitor (eDP) primary. If I plug again the external one, the internal
monitor turns black and the external becomes active and starts to display it's
content.

If I take a screenshot, I can see what is displayed on both monitors.

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[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

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https://bugs.freedesktop.org/show_bug.cgi?id=99784

--- Comment #15 from lazanet96@gmail.com ---
Created attachment 131434
  --> https://bugs.freedesktop.org/attachment.cgi?id=131434&action=edit
Kernel oops at drm module (4.12.rc2 kernel)

Just tested 4.12.rc2 kernel, and had another kernel oops in drm related
functions (at line 909 in attachment).

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[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

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https://bugs.freedesktop.org/show_bug.cgi?id=99784

--- Comment #16 from lazanet96@gmail.com ---
Created attachment 131532
  --> https://bugs.freedesktop.org/attachment.cgi?id=131532&action=edit
"dmesg | grep drm" output (4.12.rc2, libdrm 2.4.8)

I updated libdrm and xorg from edgers ppa, and drm-tip kernel is now able to
boot.
I attached latest "dmesg | grep drm" output. I went trough logs while changing
drm.debug mask, but have failed to see any errors.  

Package versions are:
libdrm-radeon1/artful,now 2.4.80+git20170524.eeb51df3-0ubuntu0ricotz,
4.12.0-994-lowlatency kernel,
xorg 1:7.7+19 with xserver-xorg-video-radeon 1:7.9.0-0ubuntu1

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[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

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https://bugs.freedesktop.org/show_bug.cgi?id=99784

--- Comment #17 from lazanet96@gmail.com ---
Created attachment 136058
  --> https://bugs.freedesktop.org/attachment.cgi?id=136058&action=edit
Workaround (Ubuntu 17.10 DRM 2.50.0 / 4.13.0-19-generic, LLVM 5.0.0)

After testing new version of kernel on Ubuntu 17.10 installation (wayland +
systemd) I discovered by chance that after suspend and unsuspend (systemctl
suspend), internal monitor starts displaying image and everything works (for
the first time with radeon driver).

So as a workaround I used /etc/rc.local compatibility to trigger suspend after
appropriate ring level is initialized during boot(sudo chmod +x /etc/rc.local
is also required). 

I tested same method with 14.04 LTS with no success (so I don't know exactly
what upgrade made it work).

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[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

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https://bugs.freedesktop.org/show_bug.cgi?id=99784

Martin Peres <martin.peres@free.fr> changed:

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

--- Comment #18 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/772.

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