[Bug 82285] New: displayport detects monitor, but the monitor goes into power saving

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82285

          Priority: medium
            Bug ID: 82285
          Assignee: xorg-driver-ati at lists.x.org
           Summary: displayport detects monitor, but the monitor goes into
                    power saving
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: nelg at linuxsolutions.co.nz
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/Radeon
           Product: xorg

Created attachment 104205
  --> https://bugs.freedesktop.org/attachment.cgi?id=104205&action=edit
This tar.gz contains dmesg, journalctl output, xorg logs, lspci, dmidecode,
xrandr

I can't get my laptop's displayport output to drive my monitor, using the
free ati driver.  It does work on the legacy driver, from ATI, however, that
only works on X <= 1.12, which is no fun to be stuck with, as no current
distro ships old versions of X.  I have a 27 inch dell monitor, so using
HDMI is not great option, as it can't drive a high enough resolution to look
sharp, as I want 2560 x 1440.

I think Bug 45291 is basically the same problem, and I've updated it to include
my hardware as well.

My monitor is a :DELL U2711
Video card: Mobility Radeon HD 4650
Laptop: Dell Studio 1747

This bug has a boot with drm.debug=6 attached, and as much other debugging
infomation as I could find.

I am happy to work fairly closely on this, if someone has ideas or information
they need me to collect.

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