On Mon, 09 Sep 2019, "Lakha, Bhawanpreet" Bhawanpreet.Lakha@amd.com wrote:
Hi all,
This is regarding the recent hdcp content type patch that was merged into drm-misc. (https://patchwork.freedesktop.org/patch/320958/?series=57233&rev=11)
There are displays on the market that advertise HDCP 2.2 support and will pass authentication and encryption but will then show a corrupted/blue/black screen (the driver cannot detect this). These displays work with HDCP 1.4 without any issues. Due to the large number of HDCP-supporting devices on the market we might not be able to catch them with a blacklist.
Has this been confirmed with some other HDCP source than the recently merged HDCP 2.2 support? I.e. has it been confirmed the issue is really in the sinks rather than in the source support?
BR, Jani.
From the user modes perspective, HDCP1.4 and HDCP2.2 Type0 are the same thing. Meaning that this interface doesn't allow us to force the hdcp version. Due to the problems mentioned above we might want to expose the ability for a user to force an HDCP downgrade to a certain level (e.g. 1.4) in case they experience problems.
What are your thoughts? and what would be a good way to deal with it?
Thanks,
Bhawan _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel