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<body><span class="vcard"><a class="email" href="mailto:jwrdegoede@fedoraproject.org" title="Hans de Goede <jwrdegoede@fedoraproject.org>"> <span class="fn">Hans de Goede</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - [chv] Unclaimed register detected after reading register 0x1e1110 [PORT_HOTPLUG_EN]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97798">bug 97798</a>
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<td>jwrdegoede@fedoraproject.org
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [chv] Unclaimed register detected after reading register 0x1e1110 [PORT_HOTPLUG_EN]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97798#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [chv] Unclaimed register detected after reading register 0x1e1110 [PORT_HOTPLUG_EN]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97798">bug 97798</a>
from <span class="vcard"><a class="email" href="mailto:jwrdegoede@fedoraproject.org" title="Hans de Goede <jwrdegoede@fedoraproject.org>"> <span class="fn">Hans de Goede</span></a>
</span></b>
<pre>I'm seeing this too, on a cherrytrail z8300 based cube iwork8 air tablet:
[ 1050.660449] ------------[ cut here ]------------
[ 1050.660473] WARNING: CPU: 0 PID: 1807 at
drivers/gpu/drm/i915/intel_uncore.c:
832 intel_init_vebox_ring_buffer+0x96f/0x4a40 [i915]
[ 1050.660475] Unclaimed read from register 0x1e1110
[ 1050.660519] Modules linked in: ... (many)
[ 1050.660583] CPU: 0 PID: 1807 Comm: kworker/u8:7 Tainted: G OE
4.9.0-rc8+ #6
[ 1050.660585] Hardware name: cube i1-TF/Cherry Trail CR, BIOS 5.11 05/13/2016
[ 1050.660593] Workqueue: events_unbound async_run_entry_fn
[ 1050.660599] ffffa7668114fba8 ffffffffb13ef4ad ffffa7668114fbf8
0000000000000000
[ 1050.660602] ffffa7668114fbe8 ffffffffb10a1ddb 0000034033153fac
0000000000000000
[ 1050.660606] 00000000001e1110 0000000000000001 ffff8dbfff218750
0000000000000001
[ 1050.660607] Call Trace:
[ 1050.660614] [<ffffffffb13ef4ad>] dump_stack+0x63/0x86
[ 1050.660618] [<ffffffffb10a1ddb>] __warn+0xcb/0xf0
[ 1050.660620] [<ffffffffb10a1e5f>] warn_slowpath_fmt+0x5f/0x80
[ 1050.660624] [<ffffffffb10cd4c5>] ? wake_up_process+0x15/0x20
[ 1050.660640] [<ffffffffc05727ef>] intel_init_vebox_ring_buffer+0x96f/0x4a40
[i915]
[ 1050.660656] [<ffffffffc0575a17>] intel_init_vebox_ring_buffer+0x3b97/0x4a40
[i915]
[ 1050.660668] [<ffffffffc052086a>] vlv_force_gfx_clock+0x555a/0x55b0 [i915]
[ 1050.660684] [<ffffffffc05a9e3d>] intel_hpd_init+0x6d/0x80 [i915]
[ 1050.660695] [<ffffffffc0519261>] 0xffffffffc0519261
[ 1050.660706] [<ffffffffc051930e>] 0xffffffffc051930e
[ 1050.660716] [<ffffffffc051933e>] 0xffffffffc051933e
[ 1050.660720] [<ffffffffb1446014>] pci_pm_resume+0x64/0xa0
[ 1050.660723] [<ffffffffb1445fb0>] ? pci_pm_thaw+0x90/0x90
[ 1050.660727] [<ffffffffb1553b4d>] dpm_run_callback+0x4d/0x120
[ 1050.660730] [<ffffffffb15540a6>] device_resume+0xa6/0x200
[ 1050.660732] [<ffffffffb155421d>] async_resume+0x1d/0x50
[ 1050.660735] [<ffffffffb10c4f49>] async_run_entry_fn+0x39/0x140
[ 1050.660739] [<ffffffffb10bbe24>] process_one_work+0x184/0x430
[ 1050.660742] [<ffffffffb10bc11e>] worker_thread+0x4e/0x490
[ 1050.660744] [<ffffffffb10bc0d0>] ? process_one_work+0x430/0x430
[ 1050.660747] [<ffffffffb10bc0d0>] ? process_one_work+0x430/0x430
[ 1050.660750] [<ffffffffb10c1b29>] kthread+0xd9/0xf0
[ 1050.660753] [<ffffffffb10c1a50>] ? kthread_park+0x60/0x60
[ 1050.660757] [<ffffffffb18189d5>] ret_from_fork+0x25/0x30
[ 1050.660760] ---[ end trace bd5a695839ae61ae ]---
And then after a second resume:
[ 1060.746358] [drm:intel_init_vebox_ring_buffer [i915]] *ERROR* media: timed
out waiting for forcewake ack request.
[ 1060.796482] [drm:intel_init_vebox_ring_buffer [i915]] *ERROR* media: timed
out waiting for forcewake ack request.</pre>
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