[Bug 100954] i915 I2C failures with recent chips and docking stations

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100954

Sanford Rockowitz <rockowitz at minsoft.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |REOPENED

--- Comment #2 from Sanford Rockowitz <rockowitz at minsoft.com> ---
Ricardo, 

Unfortunately, I don't see the problem on any of my own laptops, which are
older. So for me to install the latest intel drm and produce a driver
diagnostic log is pointless.  However, I've received enough bug reports from
people who have tried to use ddcutil through a docking station that I'm pretty
sure there's a problem.  

>From the original post on the intel-gfx list:

> I'm not sure how best to go about reporting these issues.  The usual bug
> reporting mechanism asks for detailed information about a specific
> system, which I don't have.   What I do have is the ability to see a
> pattern.

> Because I2C communication is so fragile (dependencies on hardware
> quirks, drivers, etc), ddcutil (which is written in C) has an extensive
> subsystem devoted to remotely diagnosing user configurations.  It
> already reports DDC (i.e. I2C) communication errors, and has interfaces
> to udev, libdrm, and x11 libraries.  If there is some i915 specific code
> I could add to refine the diagnosis, I would be happy to add that. 
> (Note: ddcutil is entirely a user space program, using the i2c-dev
> interface.)

> Suggestions on how to proceed appreciated.

That list thread led to the suggestion that I post a bug report despite the
unavailability of detail.  Hopefully I've categorized the bug properly, and
this report will at least serve as a marker that there's a problem. 

Sanford

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