Created attachment 123610 [details] annotated dmesg My monitor does not consistently enter suspend/power save mode. It does work about 50% of the time, but the other half it just stays on. This is true if I use the xfce4 powermanager to send the monitor to sleep OR if I manually issue `xset dpms force standby` from the shell. Attached is the dmesg output booting with the debug kernel flag (drm.debug=14) set. I have annotated it showing when I attempted to suspend the monitor and when it succeeded and failed. CPU: i7-4790k (haswell) using onboard video out via HDMI Motherboard: MSI Z97 Monitor: ASUS PB278 connected via HDMI Distro: Arch Linux Kernel: v4.5.3 Video drivers: xf86-video-intel 1:2.99.917+645+g88733a7-1
I tried kernel v4.6rc7 and this problem is present there as well.
This bug seems to affect the Z97 or Haswell chipset/chip. I have access to a Z77 Motherboard using an Ivybridge with integrated graphics as well connected via HDMI. On that machine, the monitor suspends as expected.
We seem to have neglected the bug quite a bit, apologies. John, since there has been quite a lot improvements pushed in kernel that will benefit to your system, please re-test with latest kernel and mark as REOPENED if you can reproduce (and attach kernel log) and RESOLVED/* if you cannot reproduce.
based on the lack of activity this bug will be closed... please if the problem is reproducible with latest configuration open a new bug including logs.
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.