FYI, we noticed the below changes on

git://anongit.freedesktop.org/drm-intel drm-intel-next-queued
commit 1f814daca43a2d99248fd754eacfb8ba12449235 ("drm/i915: add support for checking if we hold an RPM reference")


<4>[  118.822876] perf interrupt took too long (2530 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
<4>[  118.949247] perf interrupt took too long (5010 > 5000), lowering kernel.perf_event_max_sample_rate to 25000
<4>[  602.244370] ------------[ cut here ]------------
<4>[  602.244398] WARNING: CPU: 0 PID: 44 at drivers/gpu/drm/i915/intel_drv.h:1446 gen6_read32+0x1df/0x1f0 [i915]()
<4>[  602.244399] RPM wakelock ref not held during HW access
<4>[  602.244417] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver netconsole sg sr_mod cdrom snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel i915 snd_hda_codec snd_hda_core snd_hwdep drm_kms_helper syscopyarea sysfillrect sysimgblt x86_pkg_temp_thermal coretemp kvm irqbypass crct10dif_pclmul ppdev fb_sys_fops ahci crc32_pclmul libahci crc32c_intel pcspkr snd_pcm serio_raw snd_timer libata snd cryptd soundcore drm shpchp wmi parport_pc parport video
<4>[  602.244419] CPU: 0 PID: 44 Comm: kworker/0:1 Not tainted 4.4.0-rc4-00385-g1f814da #1
<4>[  602.244419] Hardware name: Hewlett-Packard HP Pro 3340 MT/17A1, BIOS 8.07 01/24/2013
<4>[  602.244424] Workqueue: events console_callback
<4>[  602.244426]  ffffffffa044e1d0 ffff8801100379b0 ffffffff81410b22 ffff8801100379f8
<4>[  602.244427]  ffff8801100379e8 ffffffff81078d96 0000000000000001 00000000000e1100
<4>[  602.244429]  ffff8800b6e40000 ffff8801104ad000 ffff8800b6e40000 ffff880110037a48
<4>[  602.244429] Call Trace:
<4>[  602.244432]  [<ffffffff81410b22>] dump_stack+0x4b/0x69
<4>[  602.244435]  [<ffffffff81078d96>] warn_slowpath_common+0x86/0xc0
<4>[  602.244437]  [<ffffffff81078e1c>] warn_slowpath_fmt+0x4c/0x50
<4>[  602.244439]  [<ffffffff8109d8a2>] ? __might_sleep+0x52/0xb0
<4>[  602.244453]  [<ffffffffa03c9e1f>] gen6_read32+0x1df/0x1f0 [i915]
<4>[  602.244468]  [<ffffffffa0403a3a>] intel_crt_get_hw_state+0x5a/0x90 [i915]
<4>[  602.244484]  [<ffffffffa03ebc98>] intel_connector_get_hw_state+0x28/0x30 [i915]
<4>[  602.244499]  [<ffffffffa03dec35>] intel_modeset_check_state+0xd5/0x8b0 [i915]
<4>[  602.244515]  [<ffffffffa03f291e>] ? intel_cleanup_plane_fb+0xfe/0x160 [i915]
<4>[  602.244530]  [<ffffffffa03eb013>] intel_atomic_commit+0x903/0xa60 [i915]
<4>[  602.244545]  [<ffffffffa00a5f07>] drm_atomic_commit+0x37/0x60 [drm]
<4>[  602.244552]  [<ffffffffa01ce14e>] drm_atomic_helper_connector_dpms+0xee/0x1a0 [drm_kms_helper]
<4>[  602.244557]  [<ffffffffa01d0c17>] drm_fb_helper_dpms+0x97/0xe0 [drm_kms_helper]
<4>[  602.244562]  [<ffffffffa01d0c9d>] drm_fb_helper_blank+0x3d/0x90 [drm_kms_helper]
<4>[  602.244577]  [<ffffffffa03ff69a>] intel_fbdev_blank+0x1a/0x60 [i915]
<4>[  602.244580]  [<ffffffff814839e7>] fb_blank+0x57/0xb0
<4>[  602.244582]  [<ffffffff8147abcb>] fbcon_blank+0xfb/0x2e0
<4>[  602.244585]  [<ffffffff810ad474>] ? set_next_entity+0xa4/0x820
<4>[  602.244588]  [<ffffffff810e2424>] ? lock_timer_base+0x54/0x70
<4>[  602.244590]  [<ffffffff810e276f>] ? try_to_del_timer_sync+0x4f/0x70
<4>[  602.244592]  [<ffffffff81514230>] do_blank_screen+0x1c0/0x260
<4>[  602.244593]  [<ffffffff815166f8>] console_callback+0x68/0x150
<4>[  602.244596]  [<ffffffff81091257>] process_one_work+0x157/0x420
<4>[  602.244598]  [<ffffffff81091eb9>] worker_thread+0x69/0x4a0
<4>[  602.244600]  [<ffffffff81091e50>] ? rescuer_thread+0x380/0x380
<4>[  602.244601]  [<ffffffff81091e50>] ? rescuer_thread+0x380/0x380
<4>[  602.244603]  [<ffffffff8109741f>] kthread+0xef/0x110
<4>[  602.244604]  [<ffffffff81097330>] ? kthread_park+0x60/0x60
<4>[  602.244607]  [<ffffffff818c6b4f>] ret_from_fork+0x3f/0x70
<4>[  602.244608]  [<ffffffff81097330>] ? kthread_park+0x60/0x60
<4>[  602.244610] ---[ end trace ba1633450090fb21 ]---
<4>[  602.244610] ---[ end trace ba1633450090fb21 ]---


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml


Thanks,
Kernel Test Robot