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Bug#613137: xserver-xorg-video-radeon: no video signal or kbd after manually launching X

On Mon, Feb 14, 2011 at 4:09 PM, GSR <gsr.bugs@infernal-iceberg.com> wrote:
> Hi,
> jcristau@debian.org (2011-02-13 at 1104.39 +0100):
>> > back, the screen shows the bg (or maybe it was left from previous run)
>> > and then monitor goes into sleep immediately, ignoring kbd as original
>> > report.
>> You should probably trim your xorg.conf down to just monitor sections to
>> stop other stuff interfering...
> Spliting it into files inside xorg.conf.d/ and playing renaming game
> (easier to move "foo.conf" to "foo.conf-" to see what part is wrong) I
> found the problem of the black screen, but also issues with how things
> are done with outputs and config. Maybe worth new bugs?
> The problem line was 'FontPath "unix/:7100"' XFS is running, but seems
> that having that line in the conf makes it go nuts in unrelated ways.
> The left issues are:
> System sees an inexistant monitor on VGA connector. The cable is
> there, but the monitor is off and not responding (otherwise it would
> had seen valid vendor name, etc via DDC, right?). Even so, the system
> insists in giving it some random settings and keep the output fully
> enabled.

If the driver can't detect the monitor using ddc, it uses load
detection for analog monitors in case the monitor does not support
ddc.  In your case the connected monitor is creating a load on the
connector.  Also, note that monitors are supposed to keep ddc working
even when the monitor is powered off, so just turning a monitor off
will not general prevent the driver from seeing it.

> Once that monitor is configured via .conf file(s) with better
> Modelines than DDC ever provided, it keeps the output enabled even
> when the config has 'Option "Enable" "false"'. At least xrandr keeps
> the modelines right.

IIRC, you need:
Option "Disable" "True"

> Set DVI-0 to be primary wihth 'Option "Primary" "true"', but that one
> is ignored and VGA is still enabled. It is trully obsessed with having
> that output even if not needed and told to forget about it for now. ;]
> Workaround is to issue "xrandr --output VGA-0 --off" in ~/.xsession,
> so apps do not get confused with false overlapping monitors (maximize,
> etc).
> I guess this bug can be closed. Thanks for the help.
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