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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Linux 4.3 Broadwell Unclaimed register detected before reading register 0x22394"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94171">94171</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Linux 4.3 Broadwell Unclaimed register detected before reading register 0x22394
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>a.titeica@navx.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>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 ]---</pre>
</div>
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