[Bug 73971] New: Intel i915 screen remains blank when resuming from suspend

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=73971

            Bug ID: 73971
           Summary: Intel i915 screen remains blank when resuming from
                    suspend
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.14.0-1.el6.elrepo.x86_64
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: denis at theleclairs.ca
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

My HP EliteBook 840 G1 refuses to resume from suspend. When I press the power
button to turn it back on after suspend, I hear the hard drive spin up and the
keyboard back light turns on but the screen remains blank. I'm guessing the
machine is waking up ok but something goes wrong with the video leaving me
without a working screen and my only option then is to do a hard power down.

I initially took this issue up with burakkucat from the ElRepo team and after
analyzing my logs, his conclusion was that the kernel was erring with the i915
driver and suggested that I should open this bug.

The complete log of my ticket with El Repo is found here:
http://elrepo.org/bugs/view.php?id=468


Specific information for this bug:

(a) the relevant line from the lspci command output that refers to my video
controller

[quote]
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT
Integrated Graphics Controller [8086:0a16] (rev 0b)
[/quote]

(b) the defined section from dmesg which shows the call trace

[quote]
------------[ cut here ]------------
WARNING: CPU: 3 PID: 35 at drivers/gpu/drm/i915/intel_pm.c:5331
i915_request_power_well+0x39/0x40 [i915]()
Modules linked in: snd_hda_intel(+) snd_hda_codec snd_hwdep snd_seq iwlmvm(+)
mac80211 snd_seq_device snd_pcm snd_timer snd soundcore iwlwifi cfg80211 rfkill
ext4 jbd2 mbcache sd_mod crc_t10dif crct10dif_common ahci libahci xhci_hcd wmi
i915 drm_kms_helper video dm_mirror dm_region_hash dm_log dm_mod
CPU: 3 PID: 35 Comm: kworker/3:1 Not tainted 3.14.0-1.el6.elrepo.x86_64 #1
Hardware name: Hewlett-Packard HP EliteBook 840 G1/198F, BIOS L71 Ver. 01.07
02/09/2014
Workqueue: events azx_probe_work [snd_hda_intel]
 00000000000014d3 ffff8802338bdd48 ffffffff816328e7 00000000000014d3
 0000000000000000 ffff8802338bdd88 ffffffff8106ceac ffffffffa00d8080
 ffff8802309f5800 0000000000000000 0000000000000000 ffff880233900000
Call Trace:
 [<ffffffff816328e7>] dump_stack+0x49/0x62
 [<ffffffff8106ceac>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff8106cefa>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa00b6509>] i915_request_power_well+0x39/0x40 [i915]
 [<ffffffffa0408a42>] hda_display_power+0x42/0x50 [snd_hda_intel]
 [<ffffffffa040717b>] azx_probe_continue+0x4b/0x2a0 [snd_hda_intel]
 [<ffffffffa04073e5>] azx_probe_work+0x15/0x20 [snd_hda_intel]
 [<ffffffff810898fc>] process_one_work+0x17c/0x420
 [<ffffffff8108b043>] worker_thread+0x123/0x400
 [<ffffffff8108af20>] ? manage_workers+0x170/0x170
 [<ffffffff81090b0e>] kthread+0xce/0xf0
 [<ffffffff81090a40>] ? kthread_freezable_should_stop+0x70/0x70
 [<ffffffff8164003c>] ret_from_fork+0x7c/0xb0
 [<ffffffff81090a40>] ? kthread_freezable_should_stop+0x70/0x70
---[ end trace 843af60ca0d6ae5a ]---
[/quote]

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