[Bug 101044] [SKL Xeon DP-to-VGA] no hotplug signal from DP-to-VGA branch device after unplug/replug cycle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101044

--- Comment #13 from amy.shih <amy.shih at advantech.com.tw> ---
Hi Sir,

We added the function "intel_dp_sink_dpmspatch" patch on "drm-intel-nightly"
source code & rebuild the kernel, the VGA no signal issue is gone.

We also test the patch on CentOS 7.3.1611 with kernel 3.10.0-514.10.2, the VGA
no signal issue is also gone.

Enclosed dmesg logs are for patch on "drm-intel-nightly" source code.

[patch_dmesg_after_boot_up.log]:

dmesg after booting up the OS with VGA cable connected.


[patch_dmesg_after_pull_out_VGA_cable.log]:

dmesg after pull out VGA cable.

[patch_dmesg_after_pull_in_VGA_cable.log]

dmesg after pull in VGA cable.

Could you explain why we need to add this patch to make VGA work & does this
patch have any side effect? 

Thank you!

Amy Shih
Amy.Shih at advantech.com.tw

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