[Bug 80930] New: WARNING ... i965_enable_backlight ... backlight already enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80930

          Priority: medium
            Bug ID: 80930
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: WARNING ... i965_enable_backlight ... backlight
                    already enabled
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: manuelkrause at netscape.net
          Hardware: All
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 102286
  --> https://bugs.freedesktop.org/attachment.cgi?id=102286&action=edit
dmesg.3.14.10-vanilla.20140704.drm.debug=0xe.log

I'm getting this WARNING since 3.14.x after resuming from suspend-to-disk/
hibernate:

[30553.549066] ------------[ cut here ]------------
[30553.549104] WARNING: CPU: 0 PID: 13518 at
drivers/gpu/drm/i915/intel_panel.c:727 i965_enable_backlight+0x12a/0x150
[i915]()
[30553.549105] backlight already enabled
[30553.549129] Modules linked in: xts gf128mul dm_crypt pppoe pppox af_packet
ppp_generic slhc xt_pkttype xt_LOG xt_limit ip6t_REJECT xt_tcpudp
nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT iptable_raw xt_CT
iptable_filter ip6table_mangle pci_stub nf_conntrack_netbios_ns
nf_conntrack_broadcast vboxpci(O) nf_conntrack_ipv4 nf_defrag_ipv4
vboxnetadp(O) ip_tables vboxnetflt(O) xt_conntrack nf_conntrack ip6table_filter
ip6_tables x_tables vboxdrv(O) fuse hp_wmi sparse_keymap iTCO_wdt rfkill
iTCO_vendor_support coretemp kvm_intel kvm snd_hda_codec_hdmi microcode
snd_hda_codec_analog snd_hda_codec_generic joydev serio_raw snd_hda_intel
snd_hda_codec snd_hwdep snd_pcm snd_seq snd_timer snd_seq_device snd lpc_ich
mfd_core tg3 libphy ptp pps_core tpm_infineon soundcore wmi battery tpm_tis tpm
hp_accel
[30553.549135]  lis3lv02d input_polldev evdev ac acpi_cpufreq sg loop dm_mod
ipv6 autofs4 btrfs raid6_pq xor i915 drm_kms_helper drm i2c_algo_bit video
button
[30553.549138] CPU: 0 PID: 13518 Comm: kworker/u8:4 Tainted: G           O
3.14.10-ck1-XTRA #14
[30553.549138] Hardware name: Hewlett-Packard HP Compaq 6730b
(KU489ET#ABD)/30DD, BIOS 68PDD Ver. F.20 12/07/2011
[30553.549144] Workqueue: events_unbound async_run_entry_fn
[30553.549146]  0000000000000009 ffff880127c139f8 ffffffff814a3140
ffff880127c13a40
[30553.549148]  ffff880127c13a30 ffffffff810435c3 ffff8800b5798000
0000000000000000
[30553.549149]  ffff8800b5791400 00000000e0000000 ffff8800b56e0700
ffff880127c13a90
[30553.549150] Call Trace:
[30553.549156]  [<ffffffff814a3140>] dump_stack+0x4d/0x6f
[30553.549158]  [<ffffffff810435c3>] warn_slowpath_common+0x73/0x90
[30553.549160]  [<ffffffff81043627>] warn_slowpath_fmt+0x47/0x50
[30553.549178]  [<ffffffffa00f038f>] ? gen4_read32+0x2f/0x40 [i915]
[30553.549194]  [<ffffffffa00d94fa>] i965_enable_backlight+0x12a/0x150 [i915]
[30553.549210]  [<ffffffffa00da4e4>] intel_panel_enable_backlight+0xa4/0xe0
[i915]
[30553.549231]  [<ffffffffa00f0460>] ? gen4_write64+0x40/0x40 [i915]
[30553.549245]  [<ffffffffa00c4ea8>] intel_enable_lvds+0x158/0x170 [i915]
[30553.549260]  [<ffffffffa00f0460>] ? gen4_write64+0x40/0x40 [i915]
[30553.549273]  [<ffffffffa00b9cd1>] i9xx_crtc_enable+0x2e1/0x410 [i915]
[30553.549287]  [<ffffffffa00bc59f>] __intel_set_mode+0x7ff/0x1530 [i915]
[30553.549302]  [<ffffffffa00c2764>] intel_modeset_setup_hw_state+0xab4/0xbb0
[i915]
[30553.549312]  [<ffffffffa008a2b3>] __i915_drm_thaw+0x143/0x200 [i915]
[30553.549314]  [<ffffffff810664fc>] ? pc_user_time+0xdc/0x1e0
[30553.549325]  [<ffffffffa008ac16>] i915_resume+0x26/0x40 [i915]
[30553.549335]  [<ffffffffa008ac41>] i915_pm_resume+0x11/0x20 [i915]
[30553.549337]  [<ffffffff81261df8>] pci_pm_restore+0x78/0xc0
[30553.549339]  [<ffffffff81261d80>] ? pci_pm_suspend_noirq+0x190/0x190
[30553.549341]  [<ffffffff8130dff6>] dpm_run_callback+0x26/0x60
[30553.549343]  [<ffffffff8130e654>] device_resume+0x94/0x190
[30553.549344]  [<ffffffff8130e988>] async_resume+0x18/0x40
[30553.549346]  [<ffffffff81064662>] async_run_entry_fn+0x32/0x130
[30553.549348]  [<ffffffff81058dbd>] process_one_work+0x13d/0x390
[30553.549349]  [<ffffffff81059a39>] worker_thread+0x119/0x3a0
[30553.549351]  [<ffffffff81059920>] ? manage_workers.isra.30+0x2a0/0x2a0
[30553.549353]  [<ffffffff8105f424>] kthread+0xc4/0xe0
[30553.549354]  [<ffffffff8105f360>] ? kthread_create_on_node+0x170/0x170
[30553.549356]  [<ffffffff814a973c>] ret_from_fork+0x7c/0xb0
[30553.549358]  [<ffffffff8105f360>] ? kthread_create_on_node+0x170/0x170
[30553.549359] ---[ end trace 435588afd0af3168 ]---

Also, I've got the problem, that switching from X (my KDE 
desktop) to a virtual console, the console at my notebook doesn't 
show the (initial) full brightness while the additionally 
attached VGA monitor keeps it from beginning.

These both things don't need to be connected but may be 
introduced with the same git-pull:
Two weeks ago I've tried a bisect on the WARNING issue which came 
to the result:
{MK.backlight-WARN-message.bisect.log}

I have not tested 3.13.x+ kernels after they were outdated.

Jani Nikula advised me to file a BUG on here.

Jani said: "Attach full dmesg all the way from boot with drm.debug=0xe module
parameter set."

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