From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 41121] New: Apple Thunderbolt display is not initialized when
plugged into iMac 12,2 (Radeon 6870)
Date: Thu, 22 Sep 2011 07:40:29 -0700 (PDT)
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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@lists.freedesktop.org
ReportedBy: brad@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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