[Bug 89420] DELL U2415 monitor detection issue

[Bug 89420] DELL U2415 monitor detection issue

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https://bugs.freedesktop.org/show_bug.cgi?id=89420

Alex Deucher <alexdeucher@gmail.com> changed:

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

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[Bug 89420] DELL U2415 monitor detection issue

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https://bugs.freedesktop.org/show_bug.cgi?id=89420

--- Comment #1 from Alex Deucher <alexdeucher@gmail.com> ---
Is this still an issue with a newer kernel?

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[Bug 89420] DELL U2415 monitor detection issue

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https://bugs.freedesktop.org/show_bug.cgi?id=89420

--- Comment #2 from Michiel Janssens <bugs.freedesktop@nexigon.net> ---
Tested with 3.19.0-031900-generic.
Same behaviour.

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[Bug 89420] DELL U2415 monitor detection issue

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https://bugs.freedesktop.org/show_bug.cgi?id=89420

--- Comment #3 from Michiel Janssens <bugs.freedesktop@nexigon.net> ---
Just an update.
At the moment I'm running a newer kernel.
4.1.1-040101-generic

Behaviour has changed.
I don't have to use the extra kernel parameter drm_kms_helper.edid_firmware.
Without it the monitor seems to be detected properly.
So resolution is as it should be 1920X1200, at boot time, and also when logging
in.

However the power save issue still remains.
- when the system tell the monitors to go to sleep, they both do, but when
wakingg the screens, the U2415 offten won't come out of power save mode, the
system is very sluggish at that moment. I'm not able to trigger the monitor to
come out of standby. Not by calling xrandr in terminal, switching between VT's,
or powering down the monitor. After plugging out the displayport of the U2415,
the system becomes responsive again.


- after a system suspend to ram the same as above happens.

With a reboot everything seems normal again, and in the event the U2415 has
gone into power save mode during login, switching between VT's will normally
get it out off power save.

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[Bug 89420] DELL U2415 monitor detection issue

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https://bugs.freedesktop.org/show_bug.cgi?id=89420

--- Comment #4 from Michiel Janssens <bugs.freedesktop@nexigon.net> ---
Created attachment 120036
  --> https://bugs.freedesktop.org/attachment.cgi?id=120036&action=edit
Reverse bisect log

Did a reverse bisect.

This commit seems to have fixed the detection issue.
[1d002fa720738bcd0bddb9178e9ea0773288e1dd] drm/dp: Use large transactions for
I2C over AUX

For the other issue I will file a separate report.

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[Bug 89420] DELL U2415 monitor detection issue

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https://bugs.freedesktop.org/show_bug.cgi?id=89420

Benjamin Bellec <b.bellec@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |b.bellec@gmail.com

--- Comment #5 from Benjamin Bellec <b.bellec@gmail.com> ---
I have the same powersave issue with a Dell U2414H (1920*1080). It's a simple
monitor setup (only one screen plugged to the videocard).

On a Radeon HD5850 or a GeForce GTX 950 (both with free drivers), my
motherboard POST is displayed, but when Fedora begins to load the screen goes
to powersave. I have to unplug and plug again the DisplayPort cable on the
videocard to get the screen back. Note that if I remember well, sometimes it
works perfectly.

The problem also occurs when I reboot the computer from Fedora, then the screen
stays in powersave mode, I don't even see the motherboard POST.

The screen is plugged with a DisplayPort (to videocard) <--> MiniDisplayPort
(to the screen). This is cable which comes with the screen. The screen is
configured in DP1.1a mode. I can switch to DP1.2 with the OSD screen menu, in
that case the Radeon seems to handle it (though the powersave issue remains)
but the GeForce card get not more screen at all.

I just got a second screen from Dell RMA, and the problem remains.

My config:
Fedora 23 (x86-64)
kernel 4.4.6-300.fc23.x86_64
libdrm 2.4.66-1.fc23


Please please fix it, this is a really boring issue :(

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[Bug 89420] DELL U2415 monitor detection issue

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https://bugs.freedesktop.org/show_bug.cgi?id=89420

--- Comment #6 from Benjamin Bellec <b.bellec@gmail.com> ---
The problem is still present in Fedora 24:
- kernel 4.6.7-300.x86_64
- libdrm 2.4.70-1.x86_64

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[Bug 89420] DELL U2415 monitor detection issue

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https://bugs.freedesktop.org/show_bug.cgi?id=89420

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

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

--- Comment #7 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/590.

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