Hi,
This just happened to me:
Aug 6 21:37:37 mdontu-l kernel: ------------[ cut here ]------------
Aug 6 21:37:37 mdontu-l kernel: WARNING: CPU: 3 PID: 4823 at drivers/gpu/drm/i915/intel_display.c:3313 intel_crtc_wait_for_pending_flips+0x16c/0x180()
Aug 6 21:37:37 mdontu-l kernel: Modules linked in: hdaps(O) tp_smapi(O) thinkpad_ec(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) iwldvm iwlwifi e1000e
Aug 6 21:37:37 mdontu-l kernel: CPU: 3 PID: 4823 Comm: X Tainted: G O 3.16.0-gentoo #2
Aug 6 21:37:37 mdontu-l kernel: Hardware name: LENOVO 4178A4G/4178A4G, BIOS 83ET76WW (1.46 ) 07/05/2013
Aug 6 21:37:37 mdontu-l kernel: 0000000000000009 ffff88041d63fbf8 ffffffff93c212a4 0000000000000000
Aug 6 21:37:37 mdontu-l kernel: ffff88041d63fc30 ffffffff930e3a2d 0000000000000000 ffff880427b7c000
Aug 6 21:37:37 mdontu-l kernel: ffff880426f380a8 ffff880426ddf800 ffff880426ddf800 ffff88041d63fc40
Aug 6 21:37:37 mdontu-l kernel: Call Trace:
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff93c212a4>] dump_stack+0x45/0x56
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff930e3a2d>] warn_slowpath_common+0x7d/0xa0
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff930e3b0a>] warn_slowpath_null+0x1a/0x20
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff936994dc>] intel_crtc_wait_for_pending_flips+0x16c/0x180
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff931240f0>] ? __wake_up_sync+0x20/0x20
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff9369c753>] intel_crtc_disable_planes+0x33/0x1c0
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff9369cd20>] ironlake_crtc_disable+0x50/0x970
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff936457bf>] ? drm_modeset_lock+0x2f/0xd0
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff93c27fe2>] ? mutex_lock+0x12/0x30
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff9369e0af>] intel_crtc_update_dpms+0x6f/0xa0
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff936a1f09>] intel_connector_dpms+0x59/0x70
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff9363c8c9>] drm_mode_obj_set_property_ioctl+0x399/0x3a0
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff9363c900>] drm_mode_connector_property_set_ioctl+0x30/0x40
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff9362b83f>] drm_ioctl+0x1df/0x680
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff935cf8dc>] ? backlight_generate_event+0x5c/0x80
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff935d0021>] ? brightness_store+0x91/0xd0
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff93244a0c>] ? fsnotify+0x27c/0x350
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff9321b498>] do_vfs_ioctl+0x2c8/0x490
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff9320b911>] ? __sb_end_write+0x31/0x60
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff93209512>] ? vfs_write+0x1c2/0x200
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff9321b6a1>] SyS_ioctl+0x41/0x80
Aug 6 21:37:37 mdontu-l kernel: [<ffffffff93c29b52>] system_call_fastpath+0x16/0x1b
Aug 6 21:37:37 mdontu-l kernel: ---[ end trace 131b19886670715a ]---
X appeared to have stopped rendering (or nothing goes through), but the
applications worked fine (I still had sound from a video). My video
card is:
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device 21d0
Flags: bus master, fast devsel, latency 0, IRQ 43
Memory at f1400000 (64-bit, non-prefetchable) [size=4M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 6000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
I was able to switch to the terminal and reboot.
I suspect this is new in 3.16 and I've noticed some other oddities
since I upgraded from 3.15.8:
* when adjusting the screen brightness, the minimum setting is now
"LCD off";
* when watching a video in fullscreen, I can see a flicker every 10s
or so.
Thanks,
--
Mihai Donțu
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