On Thu, Feb 1, 2018 at 9:53 AM, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote: > Quoting Andy Lutomirski (2018-02-01 17:40:22) >> *However*, I do see one unfortunate side effect of turning on PSR. It >> seems that, when I move my cursor a little bit after a few seconds of >> doing nothing, there seems to be a little bit of lag, as if either a >> few frames are dropped at the beginning of the motion or maybe the >> entire motion is delayed a bit. I don't notice a similar delay when >> typing, so I'm wondering if maybe there's a minor driver bug in which >> the driver doesn't kick the panel out of PSR quite as quickly when the >> cursor is updated as it does when the framebuffer is updated. > > One thing that's important know regarding the cursor is whether the > display server is using a HW cursor or SW cursor. Could you please attach > the log from the display server (or if you are using a stock > distribution that's probably enough to work out what it is using)? > -Chris Looking at the logs, I see a few things. First, I have a few of these: Feb 01 09:24:24 laptop kernel: [drm:intel_pipe_update_start [i915]] *ERROR* Potential atomic update failure on pipe A Feb 01 09:24:48 laptop org.gnome.Shell.desktop[3261]: libinput error: event15 - libinput error: DLL0704:01 06CB:76AE Touchpad: libinput error: kernel bug: Touch jump detected and discarded. Feb 01 09:24:48 laptop org.gnome.Shell.desktop[3261]: See https://wayland.freedesktop.org/libinput/doc/1.9.3/touchpad_jumping_cursor.html for details Feb 01 09:24:50 laptop org.gnome.Shell.desktop[3261]: libinput error: event15 - libinput error: DLL0704:01 06CB:76AE Touchpad: libinput error: kernel bug: Touch jump detected and discarded. Feb 01 09:24:50 laptop org.gnome.Shell.desktop[3261]: See https://wayland.freedesktop.org/libinput/doc/1.9.3/touchpad_jumping_cursor.html for details (Hi, Peter!) So it's entirely possible that what I'm seeing is actually an input issue that's exacerbated by PSR for some bizarre reason. I got this after a recent suspend/resume: Feb 01 09:44:34 laptop systemd-logind[2412]: Lid closed. Feb 01 09:44:34 laptop systemd-logind[2412]: device-enumerator: scan all dirs Feb 01 09:44:34 laptop systemd-logind[2412]: device-enumerator: scanning /sys/bus Feb 01 09:44:34 laptop systemd-logind[2412]: device-enumerator: scanning /sys/class Feb 01 09:44:34 laptop systemd-logind[2412]: Failed to open configuration file '/etc/systemd/sleep.conf': No such file or directory Feb 01 09:44:34 laptop systemd-logind[2412]: Suspending... Feb 01 09:44:34 laptop systemd-logind[2412]: Sent message type=signal sender=n/a destination=n/a object=/org/freedesktop/login1 interface=org.freedesktop.login1.Manager member=PrepareForSleep cookie=570 reply Feb 01 09:44:34 laptop systemd-logind[2412]: Got message type=method_call sender=:1.46 destination=:1.1 object=/org/freedesktop/login1/session/_32 interface=org.freedesktop.login1.Session member=ReleaseDevice Feb 01 09:44:34 laptop systemd-logind[2412]: Sent message type=signal sender=n/a destination=:1.46 object=/org/freedesktop/login1/session/_32 interface=org.freedesktop.login1.Session member=PauseDevice cookie Feb 01 09:44:34 laptop gnome-shell[2630]: Failed to apply DRM plane transform 0: Permission denied Feb 01 09:44:34 laptop gnome-shell[2630]: drmModeSetCursor2 failed with (Permission denied), drawing cursor with OpenGL from now on But I don't see the word "cursor" in my system logs before the first suspend. What am I looking for? This is Fedora 27 running a Gnome Wayland session, but it hasn't been reinstalled in some time, so it's possible that there are some weird settings sitting around. But I did check and I have no weird i915 parameters. Also, are these things potentially related: [ 3067.702527] [drm:intel_pipe_update_start [i915]] *ERROR* Potential atomic update failure on pipe A As I'm typing this, I've seen a couple instances of what seems like a full *second* of cursor latency, but I've only gotten the potential atomic update failure once. And is there any straightforward tracing to do to distinguish between PSR exit latency and other potential sources of latency? _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
