** Description changed: [Impact] + Connect the 4K@60Hz monitor on WD19, the monitor can't light. [Fix] + As per DP spec, at first check DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT. + If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 1, read the DP_DP13_DPCD_REV to get the faster capability. If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 0, read DP_DPCD_REV. [Test] + With the patches, connect 4K@60Hz monitor on WD19, the machine can output the video to the monitor and the monitor can light. [Regression] + low, Just get one more DPCD from the extended register, compare them and get the faster one.
** Summary changed: - Get the right configuration according to the related field of dpcd + Get the extended DPCD according to the related field in the DPCD registers. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1893752 Title: Get the extended DPCD according to the related field in the DPCD registers. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1893752/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs