[Bug 79173] New: Second screen unusable on R7 250E

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79173

          Priority: medium
            Bug ID: 79173
          Assignee: xorg-driver-ati at lists.x.org
           Summary: Second screen unusable on R7 250E
        QA Contact: xorg-team at lists.x.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: ancoron at chaoslayer.de
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 7.7 (2011)
         Component: Driver/Radeon
           Product: xorg

Hardware:
- 1x Sapphire Ultimate R7 250 (1002:683f, 1x DVI, 1x HDMI, 1x DisplayPort,
passive)
- 2x Dell 3007-WFP HC (30", 2560x1600 @ 60)

Software:
- Ubuntu 14.04
- Kernel 3.13.0-27-generic
- linux-firmware package version 1.127.2

Symptom:
- DVI connection works just fine.
- HDMI or DisplayPort just produces a garbled display, although the monitors
are correctly detected by the driver in any case.

I've then tried to use the later versions provided by the xorg-edgers Ubuntu
PPA with the exact same result.

Also, there are no errors or warnings in the Xorg logs that would point to a
problem.

I probably should note that the monitors only have dual-head DVI connectors, so
for connecting DisplayPort, I used a DisplayPort-to-DVI cable and for HDMI, I
used an HDMI cable plus an HDMI-to-DVI adapter. As the result is exactly the
same in both cases, I expect that the cabling is fine. Also when connecting the
second monitor to DVI instead of the first one its also fine, so it's not a
monitor issue either.

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