[Bug 60231] New: DisplayPort monitor not detected on PowerColor Radeon HD 4850

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=60231

           Summary: DisplayPort monitor not detected on PowerColor Radeon
                    HD 4850
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.10
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri at kernel-bugs.osdl.org
        ReportedBy: prettyvanilla at lavabit.com
        Regression: No


Created an attachment (id=106381)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=106381)
dmesg output with dvi and displayport connected (drm.debug=0xE)

I have a dual-monitor setup via my PowerColor Radeon HD 4850 - one monitor is
connected via DVI, the other (main) one via DisplayPort.
While I was using fglrx that setup worked fine, with the radeon driver/module
though only the dvi monitor is detected. DisplayPort is always reported as
disconnected, no matter whether it is the only connected monitor at boot or is
hotplugged later.

The monitors in question are a Samsung SyncMaster 970P via DVI and a Eizo
FlexScan EV2333WH via DisplayPort. The Eizo does still work fine via DVI.

I'm currently running a 3.10 mainline kernel (+ radeon dpm patches) on Arch
Linux. I remember trying this about 2 years ago I think, when it didn't work as
well. Trying the 3.0 lts-kernel yields the same results, 3.10 mainline without
dpm patches ditto.

I've attached the dmesg output with drm.debug=0xE set as kernel parameter.

I have found another bug report at launchpad that seems to describe the same
issue: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1035556
Since that bug also happens on a PowerColor card, it seems likely to be a
brand-/model-specific issue.

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