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

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 71083] New: (struct drm_encoder_helper_funcs)->mode_set not re-called after display (and EDID) change
Date: Thu, 31 Oct 2013 10:34:13 +0000	[thread overview]
Message-ID: <bug-71083-502@http.bugs.freedesktop.org/> (raw)

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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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