** Description changed: - 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. + [Impact] + + * When a TV is power-cycled, it is no longer detected as an available display. + + * The root issue is in xfce4-settings: xfsettingsd. + + * The related patch correctly handles the NULL mode the TV enters when powered off. + + [Test Case] + + * Connect a TV to a computer running xfce4-settings 4.12.0, this can be in a single configuration or dual-monitor. + + * Power the TV off. + + * Power the TV on. + + * Expected: TV powers on and remains connected as an available display. + + * Actual: TV powers on and is not connected or detected. + + [Regression Potential] + + * Regression potential is minimal: The associated patch targets this + very specific scenario and behavior, and does not interact with the rest + of the codebase. + + [Original Report] + 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 + 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 + DISPLAY=:0 xrandr --output $OUTPUT --mode $MODE + sleep 2 done ==============================
-- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers in Ubuntu. https://bugs.launchpad.net/bugs/1308105 Title: [SRU] Xfce resets TV mode to NULL when power cycled To manage notifications about this bug go to: https://bugs.launchpad.net/mythbuntu/+bug/1308105/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
