Messages in this thread | | | Date | Mon, 8 Dec 2014 12:32:01 +1000 | Subject | Re: WARNING: /usr/projects/linux/linux/drivers/gpu/drm/i915/intel_pm.c:6585 intel_display_power_put+0x4b/0x116 [i915]() | From | Dave Airlie <> |
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On 8 December 2014 at 10:34, Theodore Ts'o <tytso@mit.edu> wrote: > This is an update to a problem which I reported several months ago > (see below). The symptoms have changed a bit since then, but they've > stablized since 3.17 and 3.18-rcX, and while annoying, it's tolerable, > so I've been living with it. > > What I'm basically seeing now is that any external monitor (either a > Dell 30" or Dell 24") will be seen after a reboot or a restart of the > X server. But if suspend the laptop, disconnect from the dock, and > resume, and then later on, reconnect to the dock, the external > monitors are not visible until I kill and restart the X server. > Another part of the symptom is when I try to probe for the monitors, > using either xrandr or xfce4-display-settings, the system freezes for > a second or two, and then when it recovers, if I look in the logs, I > see the following warning message, repeated twice:
I suspect a lot of the problems are just that xfce isn't sufficiently handling randr events, and it is getting out of sync, it is like hotplug networking before NetworkManager etc.
I just tried using XFCE from F21 and if I leave the display settings app open it crashes hard when I tried the cycle above, which didn't lend me much confidence, it also never reenabled the monitor when it came back,
I've tried a few cycles of this with GNOME desktop and it seems to work pretty well.
I'll try reproducing the exact problem you are seeing however,
I haven't managed that with drm-next tree which has v3.18 merged now.
The i915 driver also has a tendency to WARN_ON on pointless things, the i915 developers insist these are actual bugs, but don't insist on producing patches to fix them in a reasonable time frame or if they do, they add 5 more WARN_ONs to compensate.
Dave.
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