Bug 107663

Summary:

APL: FIFO underrun observed when a 4k external monitor is connected through usb type-c to HDMI adapter

Product:

DRI

Reporter:

Raviraj Sitaram <raviraj.p.sitaram>

Component:

DRM/Intel

Assignee:

Intel GFX Bugs mailing list <intel-gfx-bugs>

Status:

RESOLVED WORKSFORME

QA Contact:

Intel GFX Bugs mailing list <intel-gfx-bugs>

Severity:

normal

Priority:

high

CC:

intel-gfx-bugs, raviraj.p.sitaram

Version:

DRI git

Hardware:

x86-64 (AMD64)

OS:

Linux (All)

Whiteboard:

Triaged, ReadyForDev

i915 platform:

BXT

i915 features:

display/Other

Bug Depends on:

Bug Blocks:

105980

Attachments:

Description	Flags
drm log	none
Hot plugging from boot up	none

Description Raviraj Sitaram 2018-08-23 11:44:37 UTC

Created attachment 141247 [details]
drm log

1. Boot APL device. 
2. Connect a 4k external monitor to the APL device through usb typeC to HDMI 
   adapter

Expected: No underrun errors to be observed

Observed: Underrun is observed during hotplug.

Attached is the captured drm log.

adapter used for the testing can be found from url: https://store.google.com/product/usb_type_c_to_hdmi_adapter

Comment 1 James Ausmus 2018-08-23 21:13:28 UTC

Hi Raviraj-

Please try to reproduce the error using drm-tip (https://cgit.freedesktop.org/drm-tip) and kernel parameters drm.debug=0x1e log_buf_len=4M, and if the problem persists attach the full dmesg from boot.

Comment 2 Lakshmi 2018-10-11 15:14:24 UTC

No feedback from more than a month.
closing as resolved works for me.

Please re-open if issue persists with latest drm-tip https://cgit.freedesktop.org/drm-tip 

Send dmesg from boot with kernel parameters drm.debug=0x1e log_buf_len=4M?

Comment 3 Sudarshan Srinivasan 2018-10-22 11:48:41 UTC

Created attachment 142136 [details]
Hot plugging from boot up

Logs captured with drm.debug=0x1e and log_buf_len = 4M 
kernel version :
Linux localhost 4.19.0-rc7-78904-ga9abc43bebfb #1 SMP PREEMPT Mon Oct 22 10:52:04 IST 2018 x86_64 Intel(R) Celeron(R) CPU N3450 @ 1.10GHz GenuineIntel GNU/Linux

Comment 4 Lakshmi 2019-02-26 08:52:44 UTC

(In reply to Sudarshan Srinivasan from comment #3)
> Created attachment 142136 [details]
> Hot plugging from boot up
> 
> Logs captured with drm.debug=0x1e and log_buf_len = 4M 
> kernel version :
> Linux localhost 4.19.0-rc7-78904-ga9abc43bebfb #1 SMP PREEMPT Mon Oct 22
> 10:52:04 IST 2018 x86_64 Intel(R) Celeron(R) CPU N3450 @ 1.10GHz
> GenuineIntel GNU/Linux

Can you verify this issue with latest drmtip?
Apart from the error in the log, is there any other issues you notice, asking this to understand the severity of this bug.

Comment 5 Lakshmi 2019-04-15 11:58:53 UTC

Dmesg from Latest drmtip is needed to investigate this issue further. 
If this issue occurs on drmtip, please also explain what is the impact apart from error in the log. Remember to attach dmesg from boot.

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