[Bug 71083] New: (struct drm_encoder_helper_funcs)->mode_set not re-called after display (and EDID) change

[Bug 71083] New: (struct drm_encoder_helper_funcs)->mode_set not re-called after display (and EDID) change

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=71083

          Priority: medium
            Bug ID: 71083
          Assignee: dri-devel@lists.freedesktop.org
           Summary: (struct drm_encoder_helper_funcs)->mode_set not
                    re-called after display (and EDID) change
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: zajec5@gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/other
           Product: DRI

I use my DCE5 Barts (HD69xx) with AV-receiver Onkyo TX-SR605 and one of the
following displays:
1) TV Sony Bravia KDL-52X3500
2) Projector Epson EH-TW6100

My problem is that when I change display connected to the Onkyo's output EDID
changes, but drm doesn't call mode_set as long as I use the same resolution.

To force drm to call mode_set I've to change resolution (xrandr --output HDMI-0
--mode X) and then swtich back to the mode I want.

While the display seems to be working fine without that mode_set call, the
audio engine doesn't. As part of the modesetting handler we read ELD-related
info from EDID and write it to the audio engine of the GPU. Without this
happening I can't play correctly audio (because also sees info about previous
device, not the current one).

I think mode_set should be called every time EDID changes. Is that right?

In case someone's curious:

1) EDID with Onkyo + Sony TV:
00ffffffffffff003dcb610700000000
0011010380a05a780a0dc9a057479827
12484c21080081800101010101010101
010101010101023a801871382d40582c
450040846300001e011d007251d01e20
6e28550040846300001e000000fc0054
582d53523630350a20202020000000fd
00303e0e460f000a2020202020200185
02034c705c1f03041213051420071610
15110206010f1e0b1a191d0e0a242625
2335097f070f7f071707503f06c05706
005f7e01671e00834f00006c030c0012
00b82dc000000000e3050301023a80d0
72382d40102c458040846300001e011d
00bc52d01e20b828554040846300001e
00000000000000000000000000000078

2) EDID with Onkyo + Epson projector:
00ffffffffffff004ca333d000000000
0c150104952616780aa0558d515a962a
1c505400000001010101010101010101
0101010101016a4d80a07038fc413020
36007ed710000018d49a80a07038fc41
302036007ed710000038000000fc0053
414d53554e470a2020202020000000fc
00313733485430322d4330310a200035

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[Bug 71083] (struct drm_encoder_helper_funcs)->mode_set not re-called after display (and EDID) change

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https://bugs.freedesktop.org/show_bug.cgi?id=71083

--- Comment #1 from Alex Deucher <agd5f@yahoo.com> ---
Are you unplugging the cable from the card when you switch the monitors?  That
should generate a hotplug event which will trigger the graphics stack to
reprobe the displays.  If you are just changing the monitor connected to the
receiver, it sounds like the receiver never sends a hotplug event to the card. 
As such the card has no way of knowing that the EDID has changed.

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[Bug 71083] (struct drm_encoder_helper_funcs)->mode_set not re-called after display (and EDID) change

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https://bugs.freedesktop.org/show_bug.cgi?id=71083

--- Comment #2 from Rafał Miłecki <zajec5@gmail.com> ---
I do! I unplug HDMI that is between notebook and Onkyo and then start switching
operation. I also get a notification about changed display configuration in
KDE, so I'm sure events are generate correctly.

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[Bug 71083] (struct drm_encoder_helper_funcs)->mode_set not re-called after display (and EDID) change

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https://bugs.freedesktop.org/show_bug.cgi?id=71083

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

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

--- Comment #3 from Martin Peres <martin.peres@free.fr> ---
Hi,

Freedesktop's Bugzilla instance is EOLed and open bugs are about to be migrated
to http://gitlab.freedesktop.org.

To avoid migrating out of date bugs, I am now closing all the bugs that did not
see any activity in the past year. If the issue is still happening, please
create a new bug in the relevant project at https://gitlab.freedesktop.org/drm
(use misc by default).

Sorry about the noise!

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