[Bug 104097] [CI][SHARDS] igt at pm_rpm@i2c - fail - Test assertion failure function test_i2c - Failed assertion: diff <= vga_outputs && diff >= 0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104097

--- Comment #18 from Arek Hiler <arkadiusz.hiler at intel.com> ---
Having the history a bit de-cluttered by ICLs being seemingly fixed we can take
a look
at the new landscape of failures. There are two machines that are the most
consistent
with failing (every [[idle run]]).


[[fi-hsw-4770r]]:
connector 76: type DP-1, status: connected
        physical dimensions: 0x0mm
        subpixel order: Unknown
        CEA rev: 0
        DPCD rev: 11
        audio support: no
        DP branch device present: yes
                Type: VGA
                ID: DpVga
                HW: 5.6
                SW: 1.48
        modes:
                "1024x768": 60 65000 1024 1048 1184 1344 768 771 777 806 0x40
0xa
                "800x600": 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5
                "800x600": 56 36000 800 824 896 1024 600 601 603 625 0x40 0x5
                "848x480": 60 33750 848 864 976 1088 480 486 494 517 0x40 0x5
                "640x480": 60 25175 640 656 752 800 480 490 492 525 0x40 0xa

This one seems to have VGA dongle connected but it does not have native VGA.
Because of that the test fails to realize its VGA and does not ignore it.
The dongle is the most naive one possible, just a few pins connected through
resistors, so the EDID that DRM sees is faked by the DpVga HW to reflect,
the default VGA modes. There is nothing on the other side when using i2c
directly. The test has to be fixed so that it is aware of DpVga.


[[fi-skl-lmem]]:
connector 86: type DP-1, status: connected
        physical dimensions: 0x0mm
        subpixel order: Unknown
        CEA rev: 0
        DPCD rev: 12
        audio support: no
        DP branch device present: yes
                Type: HDMI
                ID: 175IB0
                HW: 1.0
                SW: 7.32
                Max TMDS clock: 600000 kHz
                Max bpc: 12
        modes:
                "1024x768": 60 65000 1024 1048 1184 1344 768 771 777 806 0x40
0xa
                "800x600": 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5
                "800x600": 56 36000 800 824 896 1024 600 601 603 625 0x40 0x5
                "848x480": 60 33750 848 864 976 1088 480 486 494 517 0x40 0x5
                "640x480": 60 25175 640 656 752 800 480 490 492 525 0x40 0xa

This one has a HDMI dummy connected to non-native (LSPcon) HDMI on the board.
The suspicious thing here are the modes - they are the default VGA ones.
The HDMI dummy may be faulty one and fails to talk i2c and the LSPcon HW is
faking an EDID. I would advice replacing the dongle.


[idle run]:     https://intel-gfx-ci.01.org/#idle-runs
[fi-hsw-4770r]: https://intel-gfx-ci.01.org/hardware.html#fi-hsw-4770r
[fi-skl-lmem]:  https://intel-gfx-ci.01.org/hardware.html#fi-skl-lmem

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