[Bug 195096] New: Corrupted colours in X.org with nvidia-driver 340.46

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195096

            Bug ID: 195096
           Summary: Corrupted colours in X.org with nvidia-driver 340.46
           Product: Ports Tree
           Version: Latest
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: jason.mann at gmail.com

- Overview:

nvidia-driver-340.46, the current version in ports/pkgs at this time, does not
appear to work correctly with the GPU in my laptop when running X.org.  The
entire colour palette appears to be corrupted.

- Steps to reproduce:

Install X.org and nvidia-driver-340.56.  Configure X.org to use the driver
using nvidia-xconfig.

Start X.org.

- Actual results:

When the system switches into graphical mode upon starting X.org, all colour is
corrupted.  Xterm windows that should be white are instead a shade of green,
and all other elements on the screen are similarly miscoloured.

- Expected results:

Colour should be correct in X.org.

- Hardware:

Dell Vostro 1700 laptop, with NVIDIA GeForce 8600m GT GPU - confirmed as still
supported by the current driver.

- Additional Information:

This problem occurs with both the prebuilt package and the port, with and
without Linux support enabled.

It did not occur with the previous 331.67 version from ports/packages.

I downloaded and installed the newer 340.58 driver directly from NVIDIA. 
Colour was correct with this version.  One of the "Release highlights" listed
for this version is:

  "Fixed a bug that caused incorrect colors to be displayed on X screens
running at depth 8 on some GPUs."

Not sure if this applies to this issue though, as X.org was running in a 24-bit
graphics mode, unless NVIDIA was referring to bits per colour channel when
referring to depth.

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