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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Unclaimed register detected before writing to register 0x20a8"
href="https://bugs.freedesktop.org/show_bug.cgi?id=92740">92740</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Unclaimed register detected before writing to register 0x20a8
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (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>andrew@lunn.ch
</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>Similar, but different to <a class="bz_bug_link
bz_status_NEW "
title="NEW - [i915] kernel warning hsw_unclaimed_reg_debug intel_uncore.c:619"
href="show_bug.cgi?id=91960">https://bugs.freedesktop.org/show_bug.cgi?id=91960</a>
Hardware is an Intel NUC5i3.
When i start mplayer to play a video file i get a kernel warning:
[ 744.158990] WARNING: CPU: 2 PID: 973 at
drivers/gpu/drm/i915/intel_uncore.c:620 hsw_unclaimed_reg_debug+0x65/0x80
[i915]()
[ 744.158993] Unclaimed register detected before writing to register 0x20a8
[ 744.158995] Modules linked in: nfsd auth_rpcgss oid_registry nfs_acl nfs
lockd grace fscache sunrpc intel_rapl iosf_mbi x86_pkg_temp_thermal
intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul
sha256_ssse3 sha256_generic hmac arc4 iwlmvm drbg ansi_cprng joydev btusb
aesni_intel mac80211 btrtl aes_x86_64 btbcm btintel bluetooth lrw gf128mul
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support glue_helper iwlwifi psmouse evdev snd_hda_intel
snd_hda_codec snd_hda_core ablk_helper snd_hwdep serio_raw cryptd cfg80211
snd_soc_rt5640 snd_soc_rl6231 snd_soc_core snd_compress pcspkr snd_pcm rfkill
nuvoton_cir tpm_tis sg rc_core i915 snd_timer tpm snd soundcore battery
regmap_i2c drm_kms_helper drm mei_me mei snd_soc_sst_acpi video
i2c_designware_platform
[ 744.159052] processor dw_dmac dw_dmac_core i2c_algo_bit i2c_designware_core
i2c_i801 button lpc_ich shpchp mfd_core acpi_pad tun autofs4 ext4 crc16 mbcache
jbd2 hid_logitech_hidpp sd_mod hid_logitech_dj usbhid crc32c_intel ahci libahci
libata scsi_mod ehci_pci ehci_hcd e1000e ptp pps_core xhci_pci xhci_hcd usbcore
usb_common fan thermal sdhci_acpi sdhci mmc_core i2c_hid hid
[ 744.159083] CPU: 2 PID: 973 Comm: Xorg Not tainted 4.3.0-rc7 #2
[ 744.159085] Hardware name:
\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff
\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff/NUC5i3RYB,
BIOS RYBDWi35.86A.0130.2014.1203.1639 12/03/2014
[ 744.159087] ffffffffa05104d0 ffffffff812c0209 ffff8802135c7b18
ffffffff8106eb2d
[ 744.159091] ffff880214800000 ffff8802135c7b68 00000000000020a8
00000000000020a8
[ 744.159094] 0000000000000046 ffffffff8106ebac ffffffffa0510498
0000000000000030
[ 744.159098] Call Trace:
[ 744.159104] [<ffffffff812c0209>] ? dump_stack+0x40/0x57
[ 744.159108] [<ffffffff8106eb2d>] ? warn_slowpath_common+0x7d/0xb0
[ 744.159111] [<ffffffff8106ebac>] ? warn_slowpath_fmt+0x4c/0x50
[ 744.159131] [<ffffffffa0494055>] ? hsw_unclaimed_reg_debug+0x65/0x80 [i915]
[ 744.159149] [<ffffffffa0496dd8>] ? gen8_write32+0x58/0x1b0 [i915]
[ 744.159168] [<ffffffffa0489d86>] ? gen8_logical_ring_get_irq+0x86/0xc0
[i915]
[ 744.159185] [<ffffffffa047948a>] ? __i915_wait_request+0x45a/0x500 [i915]
[ 744.159189] [<ffffffff810a9bc0>] ? wake_atomic_t_function+0x60/0x60
[ 744.159207] [<ffffffffa0479680>] ?
i915_gem_object_wait_rendering__nonblocking+0x150/0x290 [i915]
[ 744.159225] [<ffffffffa047c9d4>] ? i915_gem_set_domain_ioctl+0x94/0x120
[i915]
[ 744.159239] [<ffffffffa0345130>] ? drm_ioctl+0x110/0x440 [drm]
[ 744.159255] [<ffffffffa047c940>] ?
i915_gem_object_set_to_gtt_domain+0x150/0x150 [i915]
[ 744.159260] [<ffffffff810cf597>] ? hrtimer_start_range_ns+0x1c7/0x3b0
[ 744.159264] [<ffffffff811c9f0f>] ? do_vfs_ioctl+0x28f/0x480
[ 744.159268] [<ffffffff814433cd>] ? __sys_recvmsg+0x5d/0x70
[ 744.159271] [<ffffffff811ca174>] ? SyS_ioctl+0x74/0x80
[ 744.159275] [<ffffffff8154d636>] ? entry_SYSCALL_64_fastpath+0x16/0x75
[ 744.159277] ---[ end trace 1b4d8646c926b774 ]---
This is with 4.3.0-rc7 but i have also tried 4.2.5, debian 4.2.0, debian 4.1.0
and they all give a warning at the same time.
Warning happens every time. After the warning, mplayer falls back to software
decoding since vdpau fails. xbmc is worse, just a blank screen.</pre>
</div>
</p>
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