@All: I found out a reasonable workaround till this issue gets fixed in mainstream. It is as follows:

1. Use modesetting driver and set option 'SWcursor' to 'on' in a custom xorg config file in /etc/xorg.conf.d. This step was already mentioned in one of the posts before, however, the next step is important to have sensible mouse pointer. Otherwise, you may mouse pointer which leaves behind very bad artifacts.

2. Use a desktop environment which uses XRender as compositing backend. KDE has an option to set it eventhough it is not default. I think XFCE has option too. I'm not sure of GNOME, could not find one till now.

Step 2 leads to disabling of OpenGL backend which could mean performance might be a bit lower, but your system will be very stable and usable with this.

Hope this info helps some folks.

On 7 May 2016 at 23:54, <bugzilla-daemon@freedesktop.org> wrote:

Comment # 55 on bug 89055 from kman@fastmail.com

Been getting this in Fedora 23 (+ testing) 64-bit ever since upgrading the
hardware.

A desktop system, Intel i7 6700, built-in video, two monitors (HDMI + DVI).

The current kernel is:

Linux fiona 4.4.9-300.fc23.x86_64 #1 SMP Wed May 4 23:56:27 UTC 2016 x86_64
x86_64 x86_64 GNU/Linux

[    1.756194] ------------[ cut here ]------------
[    1.756271] WARNING: CPU: 0 PID: 135 at drivers/gpu/drm/i915/intel_pm.c:3601
skl_update_other_pipe_wm+0x1de/0x1f0 [i915]()
[    1.756273] WARN_ON(!wm_changed)
[    1.756285] Modules linked in: i915 e1000e i2c_algo_bit drm_kms_helper uas
ptp serio_raw usb_storage pps_core drm nvme video i2c_hid fjes
[    1.756290] CPU: 0 PID: 135 Comm: kworker/u16:3 Not tainted
4.4.9-300.fc23.x86_64 #1
[    1.756292] Hardware name: System manufacturer System Product Name/Z170-A,
BIOS 1702 01/28/2016
[    1.756300] Workqueue: events_unbound async_run_entry_fn
[    1.756305]  0000000000000286 000000007d583ed3 ffff88045e1174b0
ffffffff813b62ee
[    1.756308]  ffff88045e1174f8 ffffffffa0220bf8 ffff88045e1174e8
ffffffff810a4252
[    1.756311]  ffff88045e11761c ffff88045ba81000 ffff88045ba80000
0000000000000000
[    1.756312] Call Trace:
[    1.756322]  [<ffffffff813b62ee>] dump_stack+0x63/0x85
[    1.756329]  [<ffffffff810a4252>] warn_slowpath_common+0x82/0xc0
[    1.756333]  [<ffffffff810a42ec>] warn_slowpath_fmt+0x5c/0x80
[    1.756393]  [<ffffffffa015bd6e>] skl_update_other_pipe_wm+0x1de/0x1f0
[i915]
[    1.756448]  [<ffffffffa015bfd2>] skl_update_wm+0x252/0x750 [i915]
[    1.756501]  [<ffffffffa01604de>] intel_update_watermarks+0x1e/0x30 [i915]
[    1.756581]  [<ffffffffa01c8b80>] haswell_crtc_enable+0x370/0x870 [i915]
[    1.756656]  [<ffffffffa01c4712>] intel_atomic_commit+0x492/0x1420 [i915]
[    1.756694]  [<ffffffffa00621ae>] ? drm_atomic_check_only+0x18e/0x590 [drm]
[    1.756727]  [<ffffffffa00625e7>] drm_atomic_commit+0x37/0x60 [drm]
[    1.756742]  [<ffffffffa00f21af>] restore_fbdev_mode+0x22f/0x260
[drm_kms_helper]
[    1.756756]  [<ffffffffa00f4383>]
drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper]
[    1.756767]  [<ffffffffa00f43fd>] drm_fb_helper_set_par+0x2d/0x50
[drm_kms_helper]
[    1.756847]  [<ffffffffa01db39a>] intel_fbdev_set_par+0x1a/0x60 [i915]
[    1.756853]  [<ffffffff814283c0>] fbcon_init+0x570/0x5f0
[    1.756858]  [<ffffffff814a9eca>] visual_init+0xca/0x130
[    1.756861]  [<ffffffff814abd61>] do_bind_con_driver+0x1c1/0x3a0
[    1.756865]  [<ffffffff814ac279>] do_take_over_console+0x149/0x1a0
[    1.756870]  [<ffffffff81424227>] do_fbcon_takeover+0x57/0xb0
[    1.756874]  [<ffffffff81428e38>] fbcon_event_notify+0x658/0x750
[    1.756878]  [<ffffffff810c369a>] notifier_call_chain+0x4a/0x70
[    1.756882]  [<ffffffff810c39d7>] __blocking_notifier_call_chain+0x47/0x60
[    1.756885]  [<ffffffff810c3a06>] blocking_notifier_call_chain+0x16/0x20
[    1.756890]  [<ffffffff8142ea8b>] fb_notifier_call_chain+0x1b/0x20
[    1.756896]  [<ffffffff81430daf>] register_framebuffer+0x20f/0x350
[    1.756909]  [<ffffffffa00f46aa>] drm_fb_helper_initial_config+0x28a/0x410
[drm_kms_helper]
[    1.756978]  [<ffffffffa01dbe9b>] intel_fbdev_initial_config+0x1b/0x20
[i915]
[    1.756984]  [<ffffffff810c510a>] async_run_entry_fn+0x4a/0x140
[    1.756988]  [<ffffffff810bc709>] process_one_work+0x159/0x430
[    1.756993]  [<ffffffff810bca2e>] worker_thread+0x4e/0x450
[    1.756997]  [<ffffffff810bc9e0>] ? process_one_work+0x430/0x430
[    1.757000]  [<ffffffff810c27b8>] kthread+0xd8/0xf0
[    1.757003]  [<ffffffff810c26e0>] ? kthread_worker_fn+0x160/0x160
[    1.757008]  [<ffffffff817a128f>] ret_from_fork+0x3f/0x70
[    1.757011]  [<ffffffff810c26e0>] ? kthread_worker_fn+0x160/0x160
[    1.757041] ---[ end trace fafafc83ac3f9b24 ]---

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~ Prasad Bhat