Also your kernel log suggests there is a problem with one of the DisplayPort connections, so it might be a good idea to try a different cable:
[28167.914268] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb 000000005f032448 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed [28167.923065] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb 000000005f032448 port 2: DPCD read on addr 0x4b0 for 1 bytes NAKed [28167.932714] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb 000000005f032448 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed [28167.942447] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb 000000005f032448 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed [28167.952217] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb 000000005f032448 port 2: DPCD read on addr 0x4b0 for 1 bytes NAKed [28167.961944] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb 000000005f032448 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1924814 Title: Lag in laptop + ununtu20.04 + dock = 3 Displays To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1924814/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
