You have been subscribed to a public bug: [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 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 ============================== ** Affects: ubuntu-translations Importance: Medium Status: Confirmed ** Affects: xfce4-settings Importance: Critical Status: Fix Released ** Affects: xfce4-settings (Ubuntu) Importance: Undecided Status: Fix Released ** Affects: xfce4-settings (Ubuntu Xenial) Importance: Undecided Status: Fix Committed ** Affects: xfce4-settings (Ubuntu Bionic) Importance: Undecided Status: Fix Released ** Tags: dist-upgrade downstream patch verification-needed verification-needed-xenial xenial -- [SRU] Xfce resets TV mode to NULL when power cycled https://bugs.launchpad.net/bugs/1308105 You received this bug notification because you are a member of Ubuntu Translations Coordinators, which is subscribed to Ubuntu Translations. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-translations-coordinators Post to : ubuntu-translations-coordinators@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-translations-coordinators More help : https://help.launchpad.net/ListHelp