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Message #74783
[Bug 1308105] Re: Xfce resets TV mode to NULL when power cycled
I am using the Yocto project to build a linux image containing xfce. I
have been having the same problem with a failure to detect when
disconnecting and reconnecting an LCD monitor.
I reverted commit dbd76eb58bd9d7a55de753daa5572ef24867d924, and I can
confirm that I can now disconnect the monitor at will with detection.
I'll have to use this workaround for now.
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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 xfce4-settings:
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 <superm1@xxxxxxxxxx>
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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