[Bug 45291] New: No video output via DisplayPort on Mobility HD 4670.

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https://bugs.freedesktop.org/show_bug.cgi?id=45291

             Bug #: 45291
           Summary: No video output via DisplayPort on Mobility HD 4670.
    Classification: Unclassified
           Product: DRI
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@xxxxxxxxxxxxxxxxxxxxx
        ReportedBy: jonimoose@xxxxxxxxx


Created attachment 56209
  --> https://bugs.freedesktop.org/attachment.cgi?id=56209
dmesg

I have a Dell Studio XPS 1610 laptop and a Dell U2312HM monitor with
DisplayPort. The monitor works in the BIOS but as soon as Grub loads and Linux
starts to boot it blanks and enters Powersave mode.once in X xrandr reports it
as on but there is no picture and the monitors OSD just continues to report
that it is in Powersave mode. Enabling and disabling the monitor via Xrandr
does not error and my windows manager resizes things as if it was enabled but
the monitor still shows no input.

There are no errors in dmesg during this and everything is reported as
working.(the warning at the end of dmesg is from a different HDMI monitor which
I plugged later since the DisplayPort one wasn't working)

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