[Bug 94171] New: Linux 4.3 Broadwell Unclaimed register detected before reading register 0x22394

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94171

            Bug ID: 94171
           Summary: Linux 4.3 Broadwell Unclaimed register detected before
                    reading register 0x22394
           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: a.titeica at navx.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

This is kernel 4.3.5.201602092235-1-grsec x64.
I haven't seen any kind of error when the laptop has no external monitors.
But with 2 external monitors connected (1 HDMI and 1 VGA) this happens.

------------[ cut here ]------------
WARNING: CPU: 0 PID: 0 at drivers/gpu/drm/i915/intel_uncore.c:620
hsw_unclaimed_reg_debug+0x82/0xa0 [i915]()
Unclaimed register detected before reading register 0x22394
Modules linked in: md4 nls_utf8 cifs dns_resolver fscache ctr ccm joydev btusb
btrtl btbcm btintel bluetooth iptable_raw ipt_MASQUERADE nf_nat_masquerade_ipv4
iptable_nat nf_nat_ipv4 nf_nat iptable_mangle xt_limit xt_tcpudp nf_conn
 snd_hda_intel snd_hda_codec e1000e snd_hda_core ptp mei_me mei shpchp
snd_hwdep pps_core snd_pcm_dmaengine ac97_bus toshiba_haps toshiba_acpi rfkill
sparse_keymap snd_pcm wmi dw_dmac snd_soc_sst_acpi fjes dw_dmac_core
spi_pxa2xx_p
 drm usbcore usb_common intel_gtt i8042 serio sdhci_acpi sdhci led_class video
mmc_core button
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.3.5.201602092235-1-grsec #1
Hardware name: TOSHIBA SATELLITE Z30-B/SATELLITE Z30-B, BIOS Version 3.20  
04/09/2015
 ffffffff00000002 cdce99a6a1ce469c 0000000000000000 ffffffffc034bdd0
 ffff880221203cb0 ffffffffbb2d7360 ffff880221203cf8 ffff880221203ce8
 ffffffffbb064e18 ffffffffc034bdd0 000000000000026c ffffffffc034bd98
Call Trace:
 <IRQ>  [<ffffffffbb2d7360>] dump_stack+0x4b/0x8b
 [<ffffffffbb064e18>] warn_slowpath_common+0x78/0xb0
 [<ffffffffbb064ebb>] warn_slowpath_fmt+0x6b/0xa0
 [<ffffffffc03a4ec2>] hsw_unclaimed_reg_debug+0x82/0xa0 [i915]
 [<ffffffffc03a9b8d>] gen6_read32+0x4d/0x130 [i915]
 [<ffffffffc039aad8>] intel_lrc_irq_handler+0x108/0x270 [i915]
 [<ffffffffc0363c8f>] gen8_gt_irq_handler+0x20f/0x240 [i915]
 [<ffffffffc0363d5f>] gen8_irq_handler+0x9f/0x5e0 [i915]
 [<ffffffffbb0bb5ea>] handle_irq_event_percpu+0x7a/0x130
 [<ffffffffbb0bb6db>] handle_irq_event+0x3b/0x60
 [<ffffffffbb0be9c1>] handle_edge_irq+0xd1/0x190
 [<ffffffffbb006739>] handle_irq+0x29/0x40
 [<ffffffffbb005fa8>] do_IRQ+0x48/0xe0
 [<ffffffffbb5ece8e>] common_interrupt+0x8e/0x8e
 <EOI>  [<ffffffffbb45fc46>] ? cpuidle_enter_state+0x156/0x210
 [<ffffffffbb45fc3f>] ? cpuidle_enter_state+0x14f/0x210
 [<ffffffffbb45fd60>] cpuidle_enter+0x20/0x30
 [<ffffffffbb0ab307>] call_cpuidle+0x37/0x70
 [<ffffffffbb0ab4ed>] cpu_startup_entry+0x1ad/0x270
 [<ffffffffbb5de594>] rest_init+0x84/0x90
 [<ffffffffbbc1320a>] 0xffffffffbbc1320a
 [<ffffffffbbc12120>] ? 0xffffffffbbc12120
 [<ffffffffbbc12328>] 0xffffffffbbc12328
 [<ffffffffbbc12328>] ? 0xffffffffbbc12328
 [<ffffffffbbc1241e>] 0xffffffffbbc1241e
---[ end trace d41631485b6e7ad8 ]---

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