[Bug 110271] [CI][SHARDS] igt at i915_pm_rpm@i2c - dmesg-fail - Failed assertion: diff <= vga_outputs && diff >= 0, Last errno: 121, Remote I/O error

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110271

Arek Hiler <arkadiusz.hiler at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED

--- Comment #12 from Arek Hiler <arkadiusz.hiler at intel.com> ---
The reproduction rate was about 5% (1 in 20) on just a single machine from ICL
shards. I think that Daniel is right attributing it to pre-prod hw issue.

We have changed the configuration of that machine and the issue has not been
reproduced since CI_DRM_6001.

We are at CI_DRM_6222 right now. We are past 10x the old rate, so I am closing
the issue.

As a side note, we were quite lucky that errno was actually tied to the
problem. The test currently opens all the /dev/i2c-* and this might have been
just a random pollution.

There's a twin bug, that is more generic/errno-less:
https://bugs.freedesktop.org/show_bug.cgi?id=104097

There's also a patch that will enable us to pinpoint i2c issues to particular
connector and will log much more details on how we failed:
https://patchwork.freedesktop.org/series/60357/

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