[Bug 54661] New: Backlight doesn't turn on after suspend on Acer 1830T with Ironlake chip

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=54661

           Summary: Backlight doesn't turn on after suspend on Acer 1830T
                    with Ironlake chip
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.8.1
          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=94281)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=94281)
lspci -vvv

After upgrading my kernel to 3.8.1 I've noticed that backlight doesn't
automatically turn on when I wake my notebook from suspend. The only way to get
backlight back is to press brightness control buttons. The following stack
trace is in my dmesg every time I do suspend/resume:

[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 3.8.0. 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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