Comment 94 for bug 1550779

shaju@678:~$ dmesg | grep i915
[ 2.088602] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
[ 2.103420] [drm] Initialized i915 1.6.0 20171023 for 0000:00:02.0 on minor 0
[ 2.264884] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[10947.862266] WARNING: CPU: 1 PID: 1174 at /build/linux-hwe-O570pP/linux-hwe-4.15.0/drivers/gpu/drm/i915/intel_display.c:1247 assert_plane+0x98/0xa0 [i915]
[10947.862307] nf_nat_ftp nf_nat binfmt_misc nf_conntrack_ftp nf_conntrack libcrc32c iptable_filter parport_pc ppdev ip_tables x_tables lp parport autofs4 ums_realtek hid_generic usbhid hid uas usb_storage i915 i2c_algo_bit drm_kms_helper psmouse syscopyarea sysfillrect sysimgblt fb_sys_fops wmi sky2 drm video
[10947.862365] RIP: 0010:assert_plane+0x98/0xa0 [i915]
[10947.862417] assert_planes_disabled.isra.96+0x4d/0x70 [i915]
[10947.862453] intel_disable_pipe+0x58/0x190 [i915]
[10947.862512] i9xx_crtc_disable+0x7e/0x410 [i915]
[10947.862549] intel_atomic_commit_tail+0x1f4/0xd90 [i915]
[10947.862585] intel_atomic_commit+0x282/0x2b0 [i915]
[10947.862673] intel_fbdev_set_par+0x1a/0x70 [i915]
[10947.880823] WARNING: CPU: 0 PID: 1174 at /build/linux-hwe-O570pP/linux-hwe-4.15.0/drivers/gpu/drm/i915/intel_display.c:1247 assert_plane+0x98/0xa0 [i915]
[10947.880864] nf_nat_ftp nf_nat binfmt_misc nf_conntrack_ftp nf_conntrack libcrc32c iptable_filter parport_pc ppdev ip_tables x_tables lp parport autofs4 ums_realtek hid_generic usbhid hid uas usb_storage i915 i2c_algo_bit drm_kms_helper psmouse syscopyarea sysfillrect sysimgblt fb_sys_fops wmi sky2 drm video
[10947.880921] RIP: 0010:assert_plane+0x98/0xa0 [i915]
[10947.880973] assert_planes_disabled.isra.96+0x4d/0x70 [i915]
[10947.881009] intel_enable_pipe+0x58/0x200 [i915]
[10947.881045] i9xx_crtc_enable+0x373/0x480 [i915]
[10947.881082] intel_update_crtc+0x47/0xa0 [i915]
[10947.881117] intel_update_crtcs+0x5d/0x70 [i915]
[10947.881153] intel_atomic_commit_tail+0x3ad/0xd90 [i915]
[10947.881189] intel_atomic_commit+0x282/0x2b0 [i915]
[10947.881288] intel_fbdev_set_par+0x1a/0x70 [i915]
[10947.900888] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[11015.563288] WARNING: CPU: 0 PID: 997 at /build/linux-hwe-O570pP/linux-hwe-4.15.0/drivers/gpu/drm/i915/intel_display.c:1247 assert_plane+0x98/0xa0 [i915]
[11015.563353] nf_nat_ftp nf_nat binfmt_misc nf_conntrack_ftp nf_conntrack libcrc32c iptable_filter parport_pc ppdev ip_tables x_tables lp parport autofs4 ums_realtek hid_generic usbhid hid uas usb_storage i915 i2c_algo_bit drm_kms_helper psmouse syscopyarea sysfillrect sysimgblt fb_sys_fops wmi sky2 drm video
[11015.563430] RIP: 0010:assert_plane+0x98/0xa0 [i915]
[11015.563497] assert_planes_disabled.isra.96+0x4d/0x70 [i915]
[11015.563542] intel_disable_pipe+0x58/0x190 [i915]
[11015.563613] i9xx_crtc_disable+0x7e/0x410 [i915]
[11015.563659] intel_atomic_commit_tail+0x1f4/0xd90 [i915]
[11015.563704] intel_atomic_commit+0x282/0x2b0 [i915]
[11015.588602] WARNING: CPU: 0 PID: 997 at /build/linux-hwe-O570pP/linux-hwe-4.15.0/drivers/gpu/drm/i915/intel_display.c:1247 assert_plane+0x98/0xa0 [i915]
[11015.588684] nf_nat_ftp nf_nat binfmt_misc nf_conntrack_ftp nf_conntrack libcrc32c iptable_filter parport_pc ppdev ip_tables x_tables lp parport autofs4 ums_realtek hid_generic usbhid hid uas usb_storage i915 i2c_algo_bit drm_kms_helper psmouse syscopyarea sysfillrect sysimgblt fb_sys_fops wmi sky2 drm video
[11015.588785] RIP: 0010:assert_plane+0x98/0xa0 [i915]
[11015.588874] assert_planes_disabled.isra.96+0x4d/0x70 [i915]
[11015.588934] intel_enable_pipe+0x58/0x200 [i915]
[11015.588993] i9xx_crtc_enable+0x373/0x480 [i915]
[11015.589054] intel_update_crtc+0x47/0xa0 [i915]
[11015.589114] intel_update_crtcs+0x5d/0x70 [i915]
[11015.589174] intel_atomic_commit_tail+0x3ad/0xd90 [i915]
[11015.589234] intel_atomic_commit+0x282/0x2b0 [i915]
[11015.606386] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun