APPLIED [OEM-5.10] Re: [SRU] [H/U/OEM-5.10] [PATCH 0/1] Fix no picture from HDMI when it's plugged after boot

[Timo Aaltonen]

On 15.4.2021 11.48, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1924238
> 
> [Impact]
> On Intel CML desktop, there's no HDMI output when the cable is not
> connected pre-boot.
> 
> [Fix]
> Properly handle lane polarity so the driver can write different values
> to the register to enable the port.
> 
> [Test]
> 1. Boot with DP display.
> 2. Connect HDMI under GNOME desktop.
> 3. No picture on HDMI monitor.
> With the fix applied, the issue is resolved.
> 
> [Where problems could occur]
> If the BIOS VBT table is not correct, which did happen in the pase, this
> fix may break those ports.
> 
> Uma Shankar (1):
>    drm/i915/display: Handle lane polarity for DDI port
> 
>   drivers/gpu/drm/i915/display/intel_bios.c | 17 +++++++++++++++++
>   drivers/gpu/drm/i915/display/intel_bios.h |  2 ++
>   drivers/gpu/drm/i915/display/intel_ddi.c  |  3 +++
>   3 files changed, 22 insertions(+)
> 


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