[Bug 30686] New: xf86-video-ati-6.13.2 scrambles 2560x1600 dual link DVI video on Radeon HD 4670

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=30686

           Summary: xf86-video-ati-6.13.2 scrambles 2560x1600 dual link
                    DVI video on Radeon HD 4670
           Product: xorg
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: adam_richter2004 at yahoo.com
         QAContact: xorg-team at lists.x.org


xf86-video-ati-6.13.2 scrambles 2560x1600 dual link DVI video on Radeon HD
4670.
xf86-video-ati from git as of 2010.10.07 also has this problem.
xf86-video-ati-6.13.1 is OK.

Sorry I do not have time to do a git bisect right now, although I may try at
some point if nobody beats me to it.  In the meantime, I figure I should still
report the bug now.

When I try to set dual link mode (2560x1600) in xf86-video-ati-6.13.2 or the
git version as of 2010 Oct. 7, I get what appears to be a bad video signal. 
Either the whole panel will display a rapidly changing or flickering image that
looks somewhat similar to analog television static, or the left side of the
panel will display this and the right side of the panel will display a blurry
image of the frame buffer that I can still use.

This problem occurs with user level mode setting.  With kernel mode setting,
the X server comes up solid black and the server log repeatedly says "Timeout
trying to update memory controller settings", followed by "You will probably
crash now...", but that too will be a separate bug report.  I mention it here
just indicate the "just run kernel mode setting" is unlikely to work for users
with a configuration like mine, although I think that fixing the kernel mode
setting issue and then saying "just run kernel mode setting" might be
sufficient solution for other Linux users (although I am not sure about where
that would leave users of other kernels, such as *BSD).

Relevant lspci lines:
$ lspci | grep VGA
02:00.0 VGA compatible controller: ATI Technologies Inc RV730XT [Radeon HD
4670]
$ lspci -n -s 02:00.0
02:00.0 0300: 1002:9490

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