On 30.07.21 18:59, Rao G wrote:
Thanks Nico.
HPD is active , measured the signal
Is your coreboot port public somewhere? If the hardware is fine, maybe the firmware isn't?
Configured Ports 1.DDI0- PortB - DP with HDMI/DVI is good in BIOS & OS 2.DDI1- PortC - DP with HDMI/DVI is good in BIOS, i915 was turning off the DP display (Never understood the reason)
It's very suspicious that these two behave differently. Does the HPD signal (MMIO read) work for DDI0?
So configured PortC with eDP
If there is no way BIOS to detect the external display with MMIO registers when configured as eDP, Can i not turn off the DDI1/Port C at runtime in BIOS,
Maybe it's time to switch to an open-source solution? libgfxinit will probably have the same issue, but it might be possible to get a rather short delay.
am expecting some register should set with eDP as interface and when display is connected
any clue why the i915 OS driver was turning off DP display in case 2?
I assume the HPD signal doesn't get through to the software.
Nico