[Bug 89878] [HSW] wakeup after STR causes drivers/gpu/drm/i915/intel_uncore.c:528 hsw_unclaimed_reg_debug.isra.11+0x78/0x90()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89878

--- Comment #3 from Thomas Kaergel <kaergel at b1-systems.de> ---
Just tried kernel gentoo-3.17.8-r1 and the trace is still in dmesg output after
STR wakeup, but X11 screen is no longer broken after STR :)
dmesg output is:

[   47.036455] ------------[ cut here ]------------
[   47.036459] WARNING: CPU: 2 PID: 3403 at
drivers/gpu/drm/i915/intel_uncore.c:528
hsw_unclaimed_reg_debug.isra.11+0x70/0x90()
[   47.036460] Unclaimed register detected before reading register 0x130040
[   47.036465] Modules linked in: ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat
vboxnetadp(O) vboxnetflt(O) vboxdrv(O) x86_pkg_temp_thermal
[   47.036467] CPU: 2 PID: 3403 Comm: kworker/u16:76 Tainted: G           O  
3.17.8-gentoo-r1 #1
[   47.036468] Hardware name: LENOVO 20BX000TGE/20BX000TGE, BIOS JBET39WW (1.04
) 12/09/2014
[   47.036470] Workqueue: events_unbound async_run_entry_fn
[   47.036472]  0000000000000009 ffff880323607be0 ffffffff819cce50
ffff880323607c28
[   47.036474]  ffff880323607c18 ffffffff8108d7e8 ffff88034bdf0060
0000000000130040
[   47.036475]  ffffffff81ca50ef 0000000000130040 ffff88034bdf0060
ffff880323607c78
[   47.036476] Call Trace:
[   47.036478]  [<ffffffff819cce50>] dump_stack+0x45/0x56
[   47.036480]  [<ffffffff8108d7e8>] warn_slowpath_common+0x78/0xa0
[   47.036482]  [<ffffffff8108d857>] warn_slowpath_fmt+0x47/0x50
[   47.036485]  [<ffffffff817a0a8e>] ? raw_pci_read+0x1e/0x40
[   47.036487]  [<ffffffff8153ee10>] hsw_unclaimed_reg_debug.isra.11+0x70/0x90
[   47.036488]  [<ffffffff81541729>] gen6_read32+0x59/0x130
[   47.036490]  [<ffffffff815556a7>] hsw_disable_pc8+0x37/0x360
[   47.036493]  [<ffffffff814fe230>] ? i915_resume_early+0x50/0x50
[   47.036494]  [<ffffffff814fe0b8>] i915_drm_thaw_early+0x58/0x60
[   47.036496]  [<ffffffff814fe21e>] i915_resume_early+0x3e/0x50
[   47.036497]  [<ffffffff814fe240>] i915_pm_resume_early+0x10/0x20
[   47.036499]  [<ffffffff815a01c0>] dpm_run_callback+0x40/0x100
[   47.036501]  [<ffffffff815a0513>] device_resume_early+0xb3/0x1a0
[   47.036502]  [<ffffffff815a0618>] async_resume_early+0x18/0x40
[   47.036504]  [<ffffffff810aa552>] async_run_entry_fn+0x32/0x130
[   47.036505]  [<ffffffff810a33e8>] process_one_work+0x148/0x3d0
[   47.036507]  [<ffffffff810a3789>] worker_thread+0x119/0x480
[   47.036509]  [<ffffffff810a3670>] ? process_one_work+0x3d0/0x3d0
[   47.036510]  [<ffffffff810a7fa4>] kthread+0xc4/0xe0
[   47.036512]  [<ffffffff810a7ee0>] ? kthread_create_on_node+0x170/0x170
[   47.036514]  [<ffffffff819d646c>] ret_from_fork+0x7c/0xb0
[   47.036516]  [<ffffffff810a7ee0>] ? kthread_create_on_node+0x170/0x170
[   47.036517] ---[ end trace 68f66717252baa96 ]---

i will now test kernel 3.14.36-gentoo.

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