[Bug 70721] New: yoga 2 pro: pentile matrix display color rendering distorted

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=70721

            Bug ID: 70721
           Summary: yoga 2 pro: pentile matrix display color rendering
                    distorted
           Product: Drivers
           Version: 2.5
    Kernel Version: up to 3.14-rc2
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: fafatheone at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

On the Lenovo Yoga 2 Pro RGBW pentile matrix display, color accuracy is bad,
especially yellow, which looks more like puke green.

Lenovo has responded to this common problem and issued a firmware ("BIOS")
update for this UEFI-based notebook, and released a new version of their power
manager for Windows 8.1, which seems to "fix" the issue.

Even after the update to the new firmware, color accuracy on Linux is bad. No
color profiles and gamma corrections can fix the greenish-brownish yellow.

A Lenovo representative writes in a comment to the official "fix" statement:

"(...)  However, this is really a two part solution - the BIOS updates the
Embedded Controller, and then the updated power manager makes calls to some of
the revised functions in the EC.   The BIOS update alone probably won't yield
the results you are looking for.  One would need some equivalent routines
running in linux. (...) " [1]

Graphics Hardware is: Intel HD 4400 (Haswell).

If you need any more information about the hardware or have something to test,
I hope I can be of help.

[1]
http://forums.lenovo.com/t5/Idea-Windows-based-Tablets-and/Yoga-2-Pro-Pentile-matrix-RGBW-characteristics-and-display-of/ta-p/1294793

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