Issue #2848 has been updated by ddb.
Status changed from New to Closed
I suspect Francois Tigeot may has fixed this with commit 1b13d1905 ("drm/i915:
Update to Linux 3.18"). According to commit message, it introduced "more
paranoid pageflips, with added error detection and recovery logic". And really,
from this update the box is running rock-stable for more than a month.
Closing the ticket. Thank you Francois, and sorry for the noise.
----------------------------------------
Bug #2848: i915: *ERROR* pipe is still busy with an old pageflip
http://bugs.dragonflybsd.org/issues/2848#change-12739
* Author: ddb
* Status: Closed
* Priority: Low
* Assignee:
* Category:
* Target version:
----------------------------------------
Process Xorg stuck in state "lwe" with kernel saying:
WARNING ({ int start_jiffies, elapsed_jiffies, remaining_jiffies, ret; _Bool
timeout_expired = 0; _Bool interrupted = 0; long retval; start_jiffies = ticks;
lockmgr(&dev_priv->pending_flip_queue.lock, 0x00000002); while (1) { if
(!intel_crtc_has_pending_flip(crtc)) break; ret =
lksleep(&dev_priv->pending_flip_queue, &dev_priv->pending_flip_queue.lock, 0,
"lwe", 60*hz); if (ret == 4 || ret == (-1)) { interrupted = 1; break; } if (ret
== 35) { timeout_expired = 1; break; } }
lockmgr(&dev_priv->pending_flip_queue.lock, 0x00000006); elapsed_jiffies =
ticks - start_jiffies; remaining_jiffies = 60*hz - elapsed_jiffies; if
(remaining_jiffies <= 0) remaining_jiffies = 1; if (timeout_expired) retval =
0; else if (interrupted) retval = -512; else if (60*hz > 0) retval =
remaining_jiffies; else retval = 1; retval; }) == 0 failed at
/usr/src/sys/dev/drm/i915/intel_display.c:3348
error: [drm:pid1018:intel_pipe_set_base] *ERROR* pipe is still busy with an old
pageflip
These two messages then repeat in 1 minute interval. Switching to console works
(but is delayed up to that 1 minute), so the system can be rebooted cleanly.
The machine runs on Intel Celeron J1900 (ie. "<ValleyView/Baytrail> on
vgapci0") with software from current dports (xorg-server-1.17.2,1 +
xf86-video-intel-2.99.2015.09.09,1).
PS: I suspect this to be some race condition as I've been running "DragonFly
desktop" on this machine for several days with no problem so far.
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