[Bug 41121] New: Apple Thunderbolt display is not initialized when plugged into iMac 12,2 (Radeon 6870)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=41121

           Summary: Apple Thunderbolt display is not initialized when
                    plugged into iMac 12,2 (Radeon 6870)
           Product: DRI
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: brad at fnarfbargle.com


Created an attachment (id=51518)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=51518)
Clean boot with nothing plugged in

This iMac has 2 "Thunderbolt" (mini-displayport connectors on the back). They
will happily drive a pair of 1920x1200 DVI monitors with mini-displayport to
DVI dongles, but will not look at the Apple "thunderbolt" monitor when plugged
in.

It does work in OSX however.

If the monitor is plugged in at boot, the kernel appears to read the EDID
correctly (the modes are displayed as what they should be), however it always
fails to bring the displayport link up.

I've included 4 dmesg runs from clean boot to a single user console.
1) clean with no external monitors
2) clean with thunderbolt monitor at boot
3) clean with DVI at boot
4) (3) but with thunderbolt plugged in at about the 30s point. (This often
reduces the machine to a steaming pile of molasses, almost like an interrupt
storm but with no outward signs except a very slow console/processing.

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