Created attachment 141247 [details]
1. Boot APL device.
2. Connect a 4k external monitor to the APL device through usb typeC to HDMI
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
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.
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?
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
(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.
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.