[Bug 47064] New: no VGA output on Radeon HD6550D when 2 monitors are connected

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Mar 7 09:52:20 PST 2012


             Bug #: 47064
           Summary: no VGA output on Radeon HD6550D when 2 monitors are
    Classification: Unclassified
           Product: xorg
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: diego.abelenda at gmail.com
         QAContact: xorg-team at lists.x.org

Created attachment 58130
  --> https://bugs.freedesktop.org/attachment.cgi?id=58130
DRI/radeon related part of dmesg

I just bought an AMD system and when I tried and connected my dual screen. When
The uEFI initializes them both display the same thing, but once radeon loads I
get only the DVI-connected one displaying anything.
I have some DisplayPort related errors in my kernel log so maybe this is an
initialization problem of KMS.

xrandr says both monitors are up and at the same resolution (1920x1080 at 60) but
obviously it doesn't talk about the same screen as me.

The fun fact was that the exact same setup worked with an nvidia card and
Second Fun fact is that on windows7 with the latest version of Catalyst the VGA
monitor gets an unsupported mode when trying to set it into 1920x1080 at 60Hz the
only way to get an image is reducing resolution to 1680x1050 (or less).

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