[Bug 93574] New: Resume from Hibernate sometimes results in blank screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93574

            Bug ID: 93574
           Summary: Resume from Hibernate sometimes results in blank
                    screen
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jhnmlkvch9 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hibernating (using systemd/uswsusp/pm-hibernate) randomly results in a blank
(no backlight) screen upon resume.

After many months of struggling to find any useful info for this problem, I
followed basic-pm-debugging instructions
(https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt) and
found this. I'm not entirely sure if this is the root cause (or even indeed the
only cause) of the blank screen issue, but figured I'd report it anyway.

(here is the input)

# echo devices > /sys/power/pm_test
# echo platform > /sys/power/disk
# echo disk > /sys/power/state

(from dmesg)

[  558.657591] ------------[ cut here ]------------
[  558.657603] WARNING: CPU: 0 PID: 1880 at
drivers/gpu/drm/i915/intel_uncore.c:620 hsw_unclaimed_reg_debug+0x69/0x90
[i915]()
[  558.657605] Unclaimed register detected after writing to register 0x71414
[  558.657606] Modules linked in: joydev mousedev tpm_infineon arc4
snd_hda_codec_realtek snd_hda_codec_generic iTCO_wdt iTCO_vendor_support ppdev
hp_wmi sparse_keymap mxm_wmi intel_rapl iosf_mbi x86_pkg_temp_thermal
intel_powerclamp coretemp iwlmvm kvm_intel kvm mac80211 crct10dif_pclmul
crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd
pcspkr iwlwifi input_leds psmouse serio_raw snd_hda_intel btusb btrtl
snd_hda_codec uvcvideo rtsx_pci_ms btbcm cfg80211 videobuf2_vmalloc btintel
snd_hda_core memstick videobuf2_memops snd_hwdep bluetooth videobuf2_core
v4l2_common videodev i2c_i801 lpc_ich e1000e rfkill snd_pcm media snd_timer snd
mei_me ie31200_edac parport_pc ptp mei edac_core shpchp pps_core parport
soundcore battery thermal hp_accel led_class lis3lv02d wmi input_polldev
[  558.657633]  tpm_tis evdev tpm hp_wireless mac_hid fjes ac processor
sch_fq_codel nfs lockd grace sunrpc fscache acpi_call(O) ip_tables x_tables
ext4 crc16 mbcache jbd2 sr_mod cdrom sd_mod rtsx_pci_sdmmc mmc_core atkbd
libps2 crc32c_intel ahci libahci libata scsi_mod rtsx_pci xhci_pci ehci_pci
xhci_hcd ehci_hcd usbcore usb_common i8042 serio i915 video button i2c_algo_bit
drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm intel_agp
intel_gtt
[  558.657655] CPU: 0 PID: 1880 Comm: kworker/u16:77 Tainted: G           O   
4.3.3-2-ARCH #1
[  558.657656] Hardware name: Hewlett-Packard HP Zbook 17 G2/2255, BIOS M70
Ver. 01.12 09/23/2015
[  558.657660] Workqueue: events_unbound async_run_entry_fn
[  558.657661]  0000000000000000 000000002b1d4e65 ffff88082d2e7bd0
ffffffff812c0dc9
[  558.657662]  ffff88082d2e7c18 ffff88082d2e7c08 ffffffff81074f42
ffff880887230000
[  558.657664]  0000000000071414 ffff880887230080 0000000000000000
ffff880887230078
[  558.657665] Call Trace:
[  558.657670]  [<ffffffff812c0dc9>] dump_stack+0x4b/0x72
[  558.657672]  [<ffffffff81074f42>] warn_slowpath_common+0x82/0xc0
[  558.657674]  [<ffffffff81074fdc>] warn_slowpath_fmt+0x5c/0x80
[  558.657679]  [<ffffffffa0130359>] hsw_unclaimed_reg_debug+0x69/0x90 [i915]
[  558.657683]  [<ffffffffa0136d97>] hsw_write32+0x97/0x150 [i915]
[  558.657687]  [<ffffffffa00ea099>] i915_restore_state+0x149/0x3a0 [i915]
[  558.657690]  [<ffffffffa00df139>] i915_drm_resume+0x39/0x150 [i915]
[  558.657693]  [<ffffffffa00df275>] i915_pm_resume+0x25/0x30 [i915]
[  558.657696]  [<ffffffff81306e69>] pci_pm_restore+0x79/0xb0
[  558.657697]  [<ffffffff81306df0>] ? pci_pm_suspend_noirq+0x180/0x180
[  558.657701]  [<ffffffff813ec02e>] dpm_run_callback+0x4e/0x130
[  558.657702]  [<ffffffff813ec5c3>] device_resume+0xd3/0x1f0
[  558.657704]  [<ffffffff813ec6fd>] async_resume+0x1d/0x50
[  558.657705]  [<ffffffff81095598>] async_run_entry_fn+0x48/0x150
[  558.657708]  [<ffffffff8108cfeb>] process_one_work+0x14b/0x440
[  558.657709]  [<ffffffff8108d328>] worker_thread+0x48/0x4a0
[  558.657710]  [<ffffffff8108d2e0>] ? process_one_work+0x440/0x440
[  558.657712]  [<ffffffff81092e68>] kthread+0xd8/0xf0
[  558.657713]  [<ffffffff81092d90>] ? kthread_worker_fn+0x170/0x170
[  558.657715]  [<ffffffff8158409f>] ret_from_fork+0x3f/0x70
[  558.657716]  [<ffffffff81092d90>] ? kthread_worker_fn+0x170/0x170
[  558.657717] ---[ end trace 2f6eca7a9bf74f82 ]---

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