[Bug 104097] [CI][SHARDS] igt at pm_rpm@i2c - fail - Failed assertion: diff <= vga_outputs && diff >= 0 / !(edid_mistmach_i2c_vs_drm)

[bugzilla-daemon at freedesktop.org]

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

--- Comment #21 from Arek Hiler <arkadiusz.hiler at intel.com> ---
skl-lmem haven't seen the issue again since changing the HDMI dummy.

Now, the biggest source of those failures are the HSW shards.

We can observe 3 failure modes:

1. corrupted EDID
(i915_pm_rpm:15800) CRITICAL: Detected EDID mismatch on connector HDMI-A-1
(i915_pm_rpm:15800) CRITICAL: i2c: 0x00 0xff 0xff 0xff 0xff 0xff 0xff 0x00 0x05
0xe3 0xcd 0x0c 0x07 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xff 0xff 0xff 
(i915_pm_rpm:15800) CRITICAL: drm: 0x00 0xff 0xff 0xff 0xff 0xff 0xff 0x00 0x24
0xf4 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x1d 0x01 0x03 0x80 0x34 0x1e 0x78 0x02
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x21 0x08 0x00 0xd1 0xc0 0x81
0xc0 0x61 0x40 0x45 0x40 0x31 0x40 0x01 0x01 0x01 0x01 0x01 0x01 0x02 0x3a 0x80
0x18 0x71 0x38 0x2d 0x40 0x58 0x2c 0x45 0x00 0x08 0x2c 0x21 0x00 0x00 0x18 0x00
0x00 0x00 0xfd 0x00 0x3b 0x3d 0x42 0x44 0x0f 0x00 0x0a 0x20 0x20 0x20 0x20 0x20
0x20 0x00 0x00 0x00 0xfc 0x00 0x49 0x47 0x54 0x0a 0x00 0x00 0x00 0x00 0x00 0x00
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x00 0x00 0x00 0x00 0x00 0x01 0x0a 


2. failed to read EDID over i2c
(i915_pm_rpm:11717) DEBUG: I2C access failed with errno 6, No such device or
address
(i915_pm_rpm:11717) CRITICAL: Detected EDID mismatch on connector HDMI-A-2
(i915_pm_rpm:11717) CRITICAL: i2c: NULL
(i915_pm_rpm:11717) CRITICAL: drm: 0x00 0xff 0xff 0xff 0xff 0xff 0xff 0x00 0x24
0xf4 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x1d 0x01 0x03 0x80 0x34 0x1e 0x78 0x02
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x21 0x08 0x00 0xd1 0xc0 0x81
0xc0 0x61 0x40 0x45 0x40 0x31 0x40 0x01 0x01 0x01 0x01 0x01 0x01 0x02 0x3a 0x80
0x18 0x71 0x38 0x2d 0x40 0x58 0x2c 0x45 0x00 0x08 0x2c 0x21 0x00 0x00 0x18 0x00
0x00 0x00 0xfd 0x00 0x3b 0x3d 0x42 0x44 0x0f 0x00 0x0a 0x20 0x20 0x20 0x20 0x20
0x20 0x00 0x00 0x00 0xfc 0x00 0x49 0x47 0x54 0x0a 0x00 0x00 0x00 0x00 0x00 0x00
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x00 0x00 0x00 0x00 0x00 0x01 0x0a 


3. DRM failed to get EDID:
(i915_pm_rpm:14052) CRITICAL: Detected EDID mismatch on connector HDMI-A-1
(i915_pm_rpm:14052) CRITICAL: i2c: 0x00 0xff 0xff 0xff 0xff 0xff 0xff 0x00 0x05
0xe3 0xcd 0x0c 0x07 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xff 0xff 0xff 
(i915_pm_rpm:14052) CRITICAL: drm: NULL
<4> [3217.152221] i915 0000:00:02.0: HDMI-A-1: EDID is invalid:
<4> [3217.152223]       [00] BAD  00 ff ff ff ff ff ff 00 ff ff ff ff ff ff ff
ff
<4> [3217.152225]       [00] BAD  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff
<4> [3217.152226]       [00] BAD  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff
<4> [3217.152227]       [00] BAD  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff
<4> [3217.152228]       [00] BAD  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff
<4> [3217.152229]       [00] BAD  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff
<4> [3217.152230]       [00] BAD  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff
<4> [3217.152231]       [00] BAD  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff


On shard-hsw1 we often see EDID being full of 0xff both for DRM and manual i2c
read (cases 1 and 3), for other shards we quite often we fail to read i2c with
no such device or address (case 2). I would advise switching dongles between
machine hsw1 and one other hsw to see whether the other machine becomes plagued
with 0xffs and HSW get the sporadic no such device or address. This would help
us attribute the issue either to the machine or to the faulty dongle.

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