I added the options:
Option "ConnectedMonitor" "DFP-0"
Option "UseDisplayDevice" "DFP-0"
to the "devices" section of my /etc/X11/xorg.conf and it seems to have fixed it
- even with the current xfce4-settings installed.
Tests I have done:
1/ boot with the television off, turn it on and get display
2/ boot with the television on, power cycle it (off time about 30 minutes) and
have display
3/ boot with the television off, switch it on for 5 minutes, off for 30
minutes, back on and have display
As above, I have the Asus M3N78 motherboard (Nvidia 8200 onboard
graphics) with nvidia-304-updates driver, using HDMI.
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https://bugs.launchpad.net/bugs/1308105
Title:
Xfce resets TV mode to NULL when power cycled
Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
Confirmed
Status in “nvidia-graphics-drivers” package in Ubuntu:
Invalid
Status in “nvidia-graphics-drivers-331” package in Ubuntu:
Invalid
Status in “xfce4-settings” package in Ubuntu:
Confirmed
Bug description:
I had an HTPC with Mythbuntu 12.04 installed. Upon upgrading a new
behavior that if the TV is power cycled it no longer detects a link
with the HTPC.
When this happens I can find in the xorg log that there is an
accompanying log item:
[ 39829.509] (II) NVIDIA(0): Setting mode "NULL"
After debugging with NVIDIA at
https://devtalk.nvidia.com/default/topic/729955/linux/tv-stops-being-
detected/ we've deteremined it's a X client that reacts to the RANDR
events causing the mode to be set to NULL.
Working through the list in an Xfce environment, the culprit is
xfsettingsd. If xfsettingsd is running, it causes the TV to come up
in a NULL mode. If it's killed, it remains in the mode it was
previously running in.
Until this is fixed, this behavior can be worked around with a simple shell
script:
==============================
#!/bin/sh
#Fix TV state when HDMI link is lost.
#By Mario Limonciello <supe...@ubuntu.com>
OUTPUT="HDMI-0"
BAD_MODE="1280x720"
GOOD_MODE="1920x1080"
for MODE in $BAD_MODE $GOOD_MODE; do
DISPLAY=:0 xrandr --output $OUTPUT --mode $MODE
sleep 2
done
==============================
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