[Bug 99337] New: No dual monitor with Radeon R7 240

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99337

            Bug ID: 99337
           Summary: No dual monitor with Radeon R7 240
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: jerome at jolimont.fr
        QA Contact: xorg-team at lists.x.org

I have a Radeon R7 240 card with two HDMI outputs.

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Oland
PRO [Radeon R7 240]

When plugging a second monitor, I can't access dual monitor features. I'm using
Mate's "Monitors" GUI and only one monitor seems to be detected, even when
clicking "refresh monitors".

xrandr output:

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 0mm x 0mm
   1920x1080      0.00* 
   1280x1024      0.00  
   1024x768       0.00  
   800x600        0.00  
   640x480        0.00 

The best I can get is a clone, with the display stretched on my widescreen
monitor to get a 5:4 resolution on the video-projector.

Anything I can/should do? Is this known issue?

Someone seems to have the same issue with another card:

https://unix.stackexchange.com/questions/326650/how-do-i-make-my-display-a-dual-screen-stretch-with-debian-jessie-and-a-radeon-r

I'm using Debian Jessie with recent kernel 

4.8.0-0.bpo.2-amd64 #1 SMP Debian 4.8.11-1~bpo8+1 (2016-12-14) x86_64 GNU/Linux

and backported mesa stuff if that matters (see
https://bugs.freedesktop.org/show_bug.cgi?id=97827#c8)

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