[Bug 54691] New: Error enabling power savings on Ironlake chip since 3.8.0

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=54691

           Summary: Error enabling power savings on Ironlake chip since
                    3.8.0
           Product: Drivers
           Version: 2.5
    Kernel Version: >= 3.8.0
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
        AssignedTo: intel-gfx-bugs at lists.freedesktop.org
        ReportedBy: itumaykin at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: Yes


Created an attachment (id=94311)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=94311)
lspci -vvv

After upgrading kernel to 3.8.0 there is the following stack
trace is in my dmesg upon every boot:

[22762.594676] ------------[ cut here ]------------
[22762.594700] WARNING: at drivers/gpu/drm/i915/i915_gem.c:1021
__wait_seqno+0x4fd/0x530 [i915]()
[22762.594701] Hardware name: Aspire 1830T
[22762.594728] Modules linked in: ipv6 nf_conntrack_ipv4 nf_defrag_ipv4
xt_conntrack nf_conntrack iptable_filter ip_tables bnep bluetooth dm_mod
uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev ums_realtek
hid_logitech_dj i915 intel_agp iTCO_wdt acer_wmi iTCO_vendor_support ath9k
ath9k_common ath9k_hw ath atl1c mac80211 cfg80211 sparse_keymap drm_kms_helper
intel_gtt video wmi
[22762.594731] Pid: 13103, comm: kworker/u:0 Tainted: G        W   
3.8.1-ACER-1830T #1
[22762.594732] Call Trace:
[22762.594743]  [<ffffffff8103907b>] ? warn_slowpath_common+0x7b/0xc0
[22762.594753]  [<ffffffffa01dc5dd>] ? __wait_seqno+0x4fd/0x530 [i915]
[22762.594766]  [<ffffffffa0211501>] ? __i915_update_gfx_val+0x31/0xf0 [i915]
[22762.594778]  [<ffffffffa02141a4>] ? i915_update_gfx_val+0x24/0x40 [i915]
[22762.594788]  [<ffffffffa01dcd5f>] ? i915_add_request+0x2bf/0x2e0 [i915]
[22762.594800]  [<ffffffffa0214a2f>] ? intel_enable_gt_powersave+0x49f/0x870
[i915]
[22762.594813]  [<ffffffffa01fc2aa>] ? intel_modeset_init_hw+0x3a/0x50 [i915]
[22762.594820]  [<ffffffffa01c91c9>] ? __i915_drm_thaw+0xd9/0xf0 [i915]
[22762.594828]  [<ffffffffa01c96f4>] ? i915_resume+0x74/0xd0 [i915]
[22762.594834]  [<ffffffff812d18a0>] ? pci_pm_thaw+0x80/0x80
[22762.594842]  [<ffffffff8137d3b6>] ? dpm_run_callback.isra.5+0x36/0x80
[22762.594845]  [<ffffffff8137d6d6>] ? device_resume+0xa6/0x140
[22762.594849]  [<ffffffff8137d784>] ? async_resume+0x14/0x40
[22762.594853]  [<ffffffff810630f7>] ? async_run_entry_fn+0xa7/0x1c0
[22762.594858]  [<ffffffff81055d07>] ? process_one_work+0x117/0x530
[22762.594861]  [<ffffffff81053119>] ? need_to_create_worker+0x9/0x20
[22762.594865]  [<ffffffff81055a8f>] ? manage_workers+0x1df/0x2a0
[22762.594867]  [<ffffffff81063050>] ? async_schedule+0x10/0x10
[22762.594871]  [<ffffffff81056562>] ? worker_thread+0x182/0x490
[22762.594874]  [<ffffffff810645bf>] ? __wake_up_common+0x4f/0x80
[22762.594878]  [<ffffffff810563e0>] ? rescuer_thread+0x280/0x280
[22762.594881]  [<ffffffff8105b9e3>] ? kthread+0xb3/0xc0
[22762.594884]  [<ffffffff81060000>] ? hrtimers_resume+0x10/0x50
[22762.594887]  [<ffffffff8105b930>] ? kthread_freezable_should_stop+0x60/0x60
[22762.594891]  [<ffffffff81564b2c>] ? ret_from_fork+0x7c/0xb0
[22762.594922]  [<ffffffff8105b930>] ? kthread_freezable_should_stop+0x60/0x60
[22762.594924] ---[ end trace 5bb601912bd1588a ]---
[22762.594927] [drm:ironlake_enable_rc6] *ERROR* failed to enable ironlake
power power savings

There was no such problem with 3.7.*. My notebook is Acer 1830T with Ironlake
chip running Gentoo amd64. I've attached lscpi output and if you need some more
info I am ready to provide it.

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