[Intel-gfx] [REGRESSION][BISECTED] drm_atomic_helper_wait_for_flip_done *ERROR* [CRTC:69:pipe C] flip_done timed out

[dmummenschanz at web.de]

Found the bad commit:

https://cgit.freedesktop.org/drm-tip/commit/?id=afb2c4437daeed2d0c49e246ad1ad4def5d913cd
drm/i915/ddi: Push pipe clock enabling to encoders

Hope this helps.

If there is anything else I can provide plz let me know.

Regards
Dieter


On Tue, Aug 28, 2018 at 06:51:31PM +0200, dmummenschanz at web.de wrote:
> Hi,
> 
> I have a Lenovo T470 notebook with a KBL (GT2) CPU connected to a docking station with two IPS monitors connected.
> According to xrandr the primary laptop screen is connected to eDP-1 and the monitors are connected to DP-2-1 and DP-2-2.
> 
> This setup worked fine until kernel 4.19-rc1. After booting into the framebuffer console the screen connected to DP-2-2 won't come on. 
> 
> When I try to startx my system locks up!
> 
> I've cranked the debug level up to drm.debug=0xe. I'm not an expert but this looks suspicious:
> ...
> [    4.465645] [drm:intel_mst_enable_dp [i915]] active links 2
> [    4.465655] [drm:intel_dp_check_mst_status [i915]] got esi 02 00 00
> [    4.466964] [drm:intel_mst_enable_dp [i915]] *ERROR* Timed out waiting for ACT sent
> [    4.478043] [drm:drm_dp_check_act_status [drm_kms_helper]] failed to get ACT bit 1 after 30 retries
> ....
> and later:
> [   14.669161] [drm:drm_atomic_helper_wait_for_flip_done [drm_kms_helper]] *ERROR* [CRTC:69:pipe C] flip_done timed out
> [   14.669269] [drm:verify_connector_state.isra.86 [i915]] [CONNECTOR:100:DP-3]
> [   14.669328] [drm:intel_atomic_commit_tail [i915]] [CRTC:55:pipe B]
> ....
> and finally after firing up X:
> [   17.741227] [drm:edp_panel_vdd_off_sync [i915]] Turning eDP port A VDD off
> [   17.741347] [drm:edp_panel_vdd_off_sync [i915]] PP_STATUS: 0x80000008 PP_CONTROL: 0x00000007
> [   24.909159] [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* [CRTC:69:pipe C] flip_done timed out
> 
> Full dmesg is provided here: https://pastebin.com/nDwvQPy6
> 
> Xorg.log doesn't reveal anything interesting. The last line in the log before freezing:
> [    73.632] (II) xfree86: Adding drm device (/dev/dri/card0)
> 
> Full log: https://pastebin.com/9RaAYhjP
> 
> This is what xrandr shows with kernel 4.18 (with 4.19 I can't get that far):
> 
> https://pastebin.com/cYSf9CyS
> 
> I've tried various settings like switching monitors or switching the dockingstation nothing helps.
> 
> Actually I've encountered this issue months earlier with drm-tip roughly about the time it 
> got merged with 4.18-rc1. I've opened a but last month but it didn't draw any attention:
> 
> https://bugs.freedesktop.org/show_bug.cgi?id=107365

This email here has more info than the bug entry, could you please update there?

> 
> Now infortunalely this regression has made it into mainline :(.
> I'll be happy to provide more information or do more tests but for now I'm out of ideas.

:( I raised the priority there, but it would be really good if you could bisect
since you can easily reproduce and knows a working point in time.

Thanks,
Rodrigo.

> 
> Regards
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