[Bug 41248] New: Monitor goes black when starting TV

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Sep 27 02:26:51 PDT 2011


           Summary: Monitor goes black when starting TV
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: gonaslund at gmail.com
         QAContact: xorg-team at lists.x.org

The problem is this:
I have an HD5770 card with 3 screens connected, 1 monitor to DisplaPort-0 and 1
monitor to the DVI-0 and a TV to the HDMI-0

When I turn my tv on the screen connected to displayport immidiately goes black
and it says "no signal". To wake this screen again i need to issue the command
"xset dpms force suspend" This will wake the screen connected to the
displayport. The same thing also happens when I turn the tv off again.

How it should work and has worked before:
I should be able to turn my tv on and off without it interfering with my other

I have pinned this regression down to happen in the kernel 3.0.3 found here
But it is alright in the kernel 3.0.2 found here

This is the changes made between 3.0.2 and 3.0.3 that i think has something to
do with my problem.

Alex Deucher (3):
      drm/radeon/kms: don't enable connectors that are off in the hotplug
      drm/radeon/kms: fix regression is handling>2 heads on cedar/caicos
      drm/radeon/kms: don't try to be smart in the hpd handler

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