https://bugzilla.kernel.org/show_bug.cgi?id=211807 Chatty (mail@xxxxxxxxx) changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |mail@xxxxxxxxx --- Comment #17 from Chatty (mail@xxxxxxxxx) --- My setup: MS Surface Book 2 + AOC U2879G6 via Surface Dock via DisplayPort Tested kernels: 5.10.0 / 5.15.3 / 5.16.0-rc1 When connecting I get random results of: * monitor remains black * monitor exhibits 1080p@60 as max resolution * monitor exhibits 1440p@60 as max resolution * monitor exhibits 2160p@30 as max resolution * monitor exhibits 2160p@30 as max resolution <== desired On boot of 5.16.0-rc1 its initialized with: > i915 0000:00:02.0: [drm] Finished loading DMC firmware > i915/kbl_dmc_ver1_04.bin (v1.4) > [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on minor 0 In the first case I see following dmesg output (black monitor): > i915 0000:00:02.0: [drm] *ERROR* mstb 0000000009cd3ca6 port 1: DPCD read on > addr 0x4b0 for 1 bytes NAKed In the last case I see following dmesg output (despite monitor working): > i915 0000:00:02.0: [drm] *ERROR* mstb 00000000f4b4c9f1 port 1: DPCD read on > addr 0x4b0 for 1 bytes NAKed > i915 0000:00:02.0: [drm] *ERROR* mstb 00000000f4b4c9f1 port 1: DPCD read on > addr 0x4b0 for 1 bytes NAKed > i915 0000:00:02.0: [drm] *ERROR* mstb 00000000f4b4c9f1 port 1: DPCD read on > addr 0x4b0 for 1 bytes NAKed > i915 0000:00:02.0: [drm] *ERROR* mstb 00000000f4b4c9f1 port 1: DPCD read on > addr 0x4b0 for 1 bytes NAKed > i915 0000:00:02.0: [drm] *ERROR* mstb 00000000f4b4c9f1 port 1: DPCD read on > addr 0x4b0 for 1 bytes NAKed -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
