[Bug 95472] [i915] Feature request: Add support for fencing for PRIME setups

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95472

--- Comment #14 from Mike Lothian <mike at fireburn.co.uk> ---
I'll test those when I get home tonight, I did however notice this in my logs
whilst the laptop wasn't doing anything:

[30445.383085] ------------[ cut here ]------------
[30445.383088] WARNING: CPU: 2 PID: 1 at drivers/gpu/drm/i915/intel_ddi.c:1644
intel_ddi_pre_enable+0x2d8/0x330
[30445.383089] WARN_ON(intel_dp->active_streams != 0)
[30445.383090] Modules linked in:
[30445.383091] CPU: 2 PID: 1 Comm: systemd Tainted: G        W      
4.7.0-fence+ #5
[30445.383092] Hardware name: Alienware Alienware 15 R2/Alienware 15 R2, BIOS
1.2.8 01/29/2016
[30445.383093]  0000000000000000 ffffffff81351c5c ffff88017e1ff878
0000000000000000
[30445.383094]  ffffffff8108f1c9 ffff8804b22c4000 ffff88017e1ff8c8
ffff8804b22c2000
[30445.383095]  ffff8804b22d0000 0000000000000000 ffff8804b22c2000
ffffffff8108f23a
[30445.383095] Call Trace:
[30445.383097]  [<ffffffff81351c5c>] ? dump_stack+0x46/0x5a
[30445.383098]  [<ffffffff8108f1c9>] ? __warn+0xb9/0xe0
[30445.383099]  [<ffffffff8108f23a>] ? warn_slowpath_fmt+0x4a/0x50
[30445.383100]  [<ffffffff815aff98>] ? intel_ddi_pre_enable+0x2d8/0x330
[30445.383101]  [<ffffffff8159fce4>] ?
intel_set_cpu_fifo_underrun_reporting+0x124/0x2a0
[30445.383103]  [<ffffffff815923fa>] ? haswell_crtc_enable+0x2ca/0x870
[30445.383104]  [<ffffffff8158e91d>] ? intel_atomic_commit_tail+0x7fd/0x1000
[30445.383105]  [<ffffffff8144e519>] ? drm_atomic_helper_swap_state+0x149/0x2f0
[30445.383106]  [<ffffffff8158f511>] ? intel_atomic_commit+0x3f1/0x500
[30445.383108]  [<ffffffff8147308c>] ? drm_atomic_check_only+0x17c/0x600
[30445.383109]  [<ffffffff81452c97>] ? restore_fbdev_mode+0x147/0x270
[30445.383110]  [<ffffffff8147257b>] ? drm_modeset_lock_all_ctx+0x9b/0xb0
[30445.383111]  [<ffffffff814546e9>] ?
drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x70
[30445.383112]  [<ffffffff81454754>] ? drm_fb_helper_set_par+0x24/0x50
[30445.383114]  [<ffffffff815a845e>] ? intel_fbdev_set_par+0xe/0x60
[30445.383115]  [<ffffffff813a8e3e>] ? fb_set_var+0x1fe/0x3e0
[30445.383116]  [<ffffffff8119f1bc>] ? __slab_free+0x9c/0x320
[30445.383117]  [<ffffffff813a3203>] ? fbcon_blank+0x2b3/0x2f0
[30445.383118]  [<ffffffff81425355>] ? do_unblank_screen+0xc5/0x180
[30445.383119]  [<ffffffff8141bb04>] ? vt_ioctl+0x4c4/0x1220
[30445.383120]  [<ffffffff81416fed>] ? tty_mode_ioctl+0x1ad/0x4b0
[30445.383121]  [<ffffffff814111e5>] ? tty_ioctl+0x315/0xbf0
[30445.383122]  [<ffffffff811cc2db>] ? do_vfs_ioctl+0x8b/0x5c0
[30445.383124]  [<ffffffff8109e6d4>] ? do_sigaction+0x174/0x190
[30445.383125]  [<ffffffff811cc846>] ? SyS_ioctl+0x36/0x70
[30445.383126]  [<ffffffff81001c19>] ? do_syscall_64+0x59/0x140
[30445.383127]  [<ffffffff8108733c>] ? entry_SYSCALL64_slow_path+0x25/0x25
[30445.383133] ---[ end trace 8d21bfa42fc3be8f ]---

Not sure if its related

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