Hi,

Dne sreda, 07. marec 2018 ob 21:30:42 CET je @lex napisal(a):
> ops, i mean turning ON.
> 
> On Wednesday, March 7, 2018 at 5:26:59 PM UTC-3, @lex wrote:
> > Hi,
> > 
> > Turning HDMI monitor during boot or after complete boot kernel shows the
> > following error:
> > 
> > [   14.842605] [<c010e99c>] (unwind_backtrace) from [<c010b5d8>]
> > (show_stack+0x10/0x14)
> > [   14.842698] [<c010b5d8>] (show_stack) from [<c07c4398>]
> > (dump_stack+0x88/0x9c)
> > [   14.842774] [<c07c4398>] (dump_stack) from [<c011bafc>]
> > (__warn+0xdc/0xf4)
> > [   14.842840] [<c011bafc>] (__warn) from [<c011bb4c>]
> > (warn_slowpath_fmt+0x38/0x48)
> > [   14.842931] [<c011bb4c>] (warn_slowpath_fmt) from [<c0470ab8>]
> > (drm_atomic_helper_commit_modeset_disables+0x468/0x46c)
> > [   14.843034] [<c0470ab8>] (drm_atomic_helper_commit_modeset_disables)
> > from [<c0470ad4>] (drm_atomic_helper_commit_tail+0x18/0x64)
> > [   14.843125] [<c0470ad4>] (drm_atomic_helper_commit_tail) from
> > [<c0470ba0>] (commit_tail+0x80/0x84)
> > [   14.843213] [<c0470ba0>] (commit_tail) from [<c0470ccc>]
> > (drm_atomic_helper_commit+0x120/0x124)
> > [   14.843298] [<c0470ccc>] (drm_atomic_helper_commit) from [<c047325c>]
> > (restore_fbdev_mode_atomic+0x178/0x1d4)
> > [   14.843385] [<c047325c>] (restore_fbdev_mode_atomic) from [<c0475ce4>]
> > (drm_fb_helper_restore_fbdev_mode_unlocked.part.9+0x1c/0x78)
> > [   14.843466] [<c0475ce4>]
> > (drm_fb_helper_restore_fbdev_mode_unlocked.part.9) from [<c0475dc8>]
> > (drm_fb_helper_set_par+0x54/0x84)
> > [   14.843543] [<c0475dc8>] (drm_fb_helper_set_par) from [<c0475ca0>]
> > (drm_fb_helper_hotplug_event.part.8+0xa8/0xb0)
> > [   14.843624] [<c0475ca0>] (drm_fb_helper_hotplug_event.part.8) from
> > [<c0467208>] (drm_helper_hpd_irq_event+0xf0/0xfc)
> > [   14.843703] [<c0467208>] (drm_helper_hpd_irq_event) from [<c04a8f0c>]
> > (dw_hdmi_irq+0xfc/0x184)
> > [   14.843775] [<c04a8f0c>] (dw_hdmi_irq) from [<c01643b0>]
> > (irq_thread_fn+0x1c/0x54)
> > [   14.843846] [<c01643b0>] (irq_thread_fn) from [<c0164684>]
> > (irq_thread+0x138/0x1f8)
> > [   14.843920] [<c0164684>] (irq_thread) from [<c013768c>]
> > (kthread+0x148/0x150)
> > [   14.844001] [<c013768c>] (kthread) from [<c0107908>]
> > (ret_from_fork+0x14/0x2c)
> > [   14.844317] ---[ end trace 98bf403d753cfda9 ]---
> > 
> > 
> > I am using framebuffer with 1920x1080 (hdmi) and kernel 4.15.7 on h2+
> > HDMI display still works after this.

You didn't copy the most useful part of that message - the actual warning. 
Fortunately, this issue is know and fix commited today to drm-misc:
https://cgit.freedesktop.org/drm/drm-misc/commit/?h=drm-misc-fixes&id=fd00c4ee76f0b509ce79ffbc1f5a682fbdd84efd

However, you are forgetting that this driver is only a week in drm-misc 
repository. You are probably using Armbian with my older, out of tree driver.

Best regards,
Jernej


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