Hi I have a secondary monitor connected via USB-C adapter to HDMI. It can manage resolutions up to 2560x1440. Most of the time, when the system is booted the resolution is detected ok, but If I suspend the machine, or replug the screen, or alternate to the text console, the resolution is "downgraded" to Full HD. I have added the paramter drm.debug=0x06 to my kernel option and I have managed to catch this error when the resolution is not detected properly: [ 4.941022] [drm:drm_mode_debug_printmodeline [drm]] Modeline 77:"2560x1440" 60 241500 2560 2608 2640 2720 1440 1443 1448 1481 0x48 0x5 [ 4.941046] [drm:drm_mode_prune_invalid [drm]] Not using 2560x1440 mode: CLOCK_HIGH On the other hand, when it works fine: [ 95.361838] [drm:drm_mode_debug_printmodeline [drm]] Modeline 85:"2560x1440" 60 241500 2560 2608 2640 2720 1440 1443 1448 1481 0x48 0x5 [ 95.928536] [drm:intel_dump_pipe_config [i915]] crtc timings: 241500 2560 2608 2640 2720 1440 1443 1448 1481, type: 0x48 flags: 0x5 [ 95.928546] [drm:intel_dump_pipe_config [i915]] port clock: 540000, pipe src size: 2560x1440, pixel rate 241500 The adapter is brand new (Xiaomi) and the cable should be of good quality (ethernet capable). Any ideas about how to debug this? The EDID seems fine, it seems related to hock clock_high is calculated. My kernel version is Linux piling 4.15.0-2-amd64 #1 SMP Debian 4.15.11-1 (2018-03-20) x86_64 GNU/Linux When it works: [ 853.586182] [drm:drm_detect_monitor_audio [drm]] Monitor has basic audio support [ 853.586850] [drm:intel_power_well_disable [i915]] disabling power well 2 [ 853.586862] [drm:drm_add_display_info [drm]] non_desktop set to 0 [ 853.586868] [drm:drm_add_display_info [drm]] HDMI: DVI dual 0, max TMDS clock 300000 kHz [ 853.586874] [drm:drm_add_display_info [drm]] non_desktop set to 0 [ 853.586879] [drm:drm_add_display_info [drm]] HDMI: DVI dual 0, max TMDS clock 300000 kHz [ 853.586956] [drm:drm_edid_to_eld [drm]] ELD monitor Q2775 [ 853.586961] [drm:drm_edid_to_eld [drm]] HDMI: latency present 0 0, video latency 0 0, audio latency 0 0 [ 853.586974] [drm:intel_connector_update_modes [i915]] ELD size 28, SAD count 1 [ 853.587047] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:69:DP-1] probed modes : [ 853.587054] [drm:drm_mode_debug_printmodeline [drm]] Modeline 84:"2560x1440" 60 241500 2560 2608 2640 2720 1440 1443 1448 1481 0x48 0x5 [ 853.587059] [drm:drm_mode_debug_printmodeline [drm]] Modeline 87:"1920x1080" 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5 [ 853.587064] [drm:drm_mode_debug_printmodeline [drm]] Modeline 123:"1920x1080" 60 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5 [ 853.587069] [drm:drm_mode_debug_printmodeline [drm]] Modeline 114:"1920x1080i" 60 74250 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15 [ 853.587073] [drm:drm_mode_debug_printmodeline [drm]] Modeline 128:"1920x1080i" 60 74176 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15 [ 853.587078] [drm:drm_mode_debug_printmodeline [drm]] Modeline 113:"1920x1080" 50 148500 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5 [ 853.587082] [drm:drm_mode_debug_printmodeline [drm]] Modeline 115:"1920x1080i" 50 74250 1920 2448 2492 2640 1080 1084 1094 1125 0x40 0x15 [ 853.587087] [drm:drm_mode_debug_printmodeline [drm]] Modeline 91:"1280x1440" 60 156000 1280 1376 1512 1744 1440 1443 1453 1493 0x40 0x6 [ 853.587091] [drm:drm_mode_debug_printmodeline [drm]] Modeline 92:"1680x1050" 60 119000 1680 1728 1760 1840 1050 1053 1059 1080 0x40 0x9 [ 853.587095] [drm:drm_mode_debug_printmodeline [drm]] Modeline 103:"1280x1024" 75 135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5 [ 853.587099] [drm:drm_mode_debug_printmodeline [drm]] Modeline 94:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5 [ 853.587104] [drm:drm_mode_debug_printmodeline [drm]] Modeline 93:"1440x900" 60 88750 1440 1488 1520 1600 900 903 909 926 0x40 0x9 [ 853.587108] [drm:drm_mode_debug_printmodeline [drm]] Modeline 95:"1280x960" 60 108000 1280 1376 1488 1800 960 961 964 1000 0x40 0x5 [ 853.587112] [drm:drm_mode_debug_printmodeline [drm]] Modeline 88:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5 [ 853.587116] [drm:drm_mode_debug_printmodeline [drm]] Modeline 124:"1280x720" 60 74176 1280 1390 1430 1650 720 725 730 750 0x40 0x5 [ 853.587121] [drm:drm_mode_debug_printmodeline [drm]] Modeline 117:"1280x720" 50 74250 1280 1720 1760 1980 720 725 730 750 0x40 0x5 [ 853.587125] [drm:drm_mode_debug_printmodeline [drm]] Modeline 104:"1024x768" 75 78750 1024 1040 1136 1312 768 769 772 800 0x40 0x5 [ 853.587129] [drm:drm_mode_debug_printmodeline [drm]] Modeline 105:"1024x768" 70 75000 1024 1048 1184 1328 768 771 777 806 0x40 0xa [ 853.587133] [drm:drm_mode_debug_printmodeline [drm]] Modeline 106:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa [ 853.587137] [drm:drm_mode_debug_printmodeline [drm]] Modeline 107:"832x624" 75 57284 832 864 928 1152 624 625 628 667 0x40 0xa [ 853.587142] [drm:drm_mode_debug_printmodeline [drm]] Modeline 108:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5 [ 853.587146] [drm:drm_mode_debug_printmodeline [drm]] Modeline 110:"800x600" 72 50000 800 856 976 1040 600 637 643 666 0x40 0x5 [ 853.587150] [drm:drm_mode_debug_printmodeline [drm]] Modeline 96:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5 [ 853.587154] [drm:drm_mode_debug_printmodeline [drm]] Modeline 97:"800x600" 56 36000 800 824 896 1024 600 601 603 625 0x40 0x5 [ 853.587158] [drm:drm_mode_debug_printmodeline [drm]] Modeline 90:"720x576" 50 27000 720 732 796 864 576 581 586 625 0x40 0xa [ 853.587163] [drm:drm_mode_debug_printmodeline [drm]] Modeline 125:"720x480" 60 27027 720 736 798 858 480 489 495 525 0x40 0xa [ 853.587167] [drm:drm_mode_debug_printmodeline [drm]] Modeline 89:"720x480" 60 27000 720 736 798 858 480 489 495 525 0x40 0xa [ 853.587171] [drm:drm_mode_debug_printmodeline [drm]] Modeline 98:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa [ 853.587175] [drm:drm_mode_debug_printmodeline [drm]] Modeline 99:"640x480" 73 31500 640 664 704 832 480 489 492 520 0x40 0xa [ 853.587180] [drm:drm_mode_debug_printmodeline [drm]] Modeline 100:"640x480" 67 30240 640 704 768 864 480 483 486 525 0x40 0xa [ 853.587184] [drm:drm_mode_debug_printmodeline [drm]] Modeline 126:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa [ 853.587188] [drm:drm_mode_debug_printmodeline [drm]] Modeline 101:"640x480" 60 25175 640 656 752 800 480 490 492 525 0x40 0xa [ 853.587192] [drm:drm_mode_debug_printmodeline [drm]] Modeline 102:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6 [ 853.587206] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:73:HDMI-A-1] When it fails: [ 11.118971] [drm:drm_detect_monitor_audio [drm]] Monitor has basic audio support [ 11.119633] [drm:drm_add_display_info [drm]] non_desktop set to 0 [ 11.119640] [drm:drm_add_display_info [drm]] HDMI: DVI dual 0, max TMDS clock 300000 kHz [ 11.119648] [drm:drm_add_display_info [drm]] non_desktop set to 0 [ 11.119653] [drm:drm_add_display_info [drm]] HDMI: DVI dual 0, max TMDS clock 300000 kHz [ 11.119747] [drm:drm_edid_to_eld [drm]] ELD monitor Q2775 [ 11.119753] [drm:drm_edid_to_eld [drm]] HDMI: latency present 0 0, video latency 0 0, audio latency 0 0 [ 11.119782] [drm:intel_connector_update_modes [i915]] ELD size 28, SAD count 1 [ 11.119873] [drm:drm_mode_debug_printmodeline [drm]] Modeline 107:"2560x1440" 60 241500 2560 2608 2640 2720 1440 1443 1448 1481 0x48 0x5 [ 11.119879] [drm:drm_mode_prune_invalid [drm]] Not using 2560x1440 mode: CLOCK_HIGH [ 11.119886] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:69:DP-1] probed modes : [ 11.119892] [drm:drm_mode_debug_printmodeline [drm]] Modeline 80:"1920x1080" 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5 [ 11.119898] [drm:drm_mode_debug_printmodeline [drm]] Modeline 114:"1920x1080" 60 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5 [ 11.119903] [drm:drm_mode_debug_printmodeline [drm]] Modeline 105:"1920x1080i" 60 74250 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15 [ 11.119909] [drm:drm_mode_debug_printmodeline [drm]] Modeline 119:"1920x1080i" 60 74176 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15 [ 11.119914] [drm:drm_mode_debug_printmodeline [drm]] Modeline 104:"1920x1080" 50 148500 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5 [ 11.119919] [drm:drm_mode_debug_printmodeline [drm]] Modeline 106:"1920x1080i" 50 74250 1920 2448 2492 2640 1080 1084 1094 1125 0x40 0x15 [ 11.119924] [drm:drm_mode_debug_printmodeline [drm]] Modeline 84:"1280x1440" 60 156000 1280 1376 1512 1744 1440 1443 1453 1493 0x40 0x6 [ 11.119929] [drm:drm_mode_debug_printmodeline [drm]] Modeline 85:"1680x1050" 60 119000 1680 1728 1760 1840 1050 1053 1059 1080 0x40 0x9 [ 11.119934] [drm:drm_mode_debug_printmodeline [drm]] Modeline 96:"1280x1024" 75 135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5 [ 11.119939] [drm:drm_mode_debug_printmodeline [drm]] Modeline 87:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5 [ 11.119945] [drm:drm_mode_debug_printmodeline [drm]] Modeline 86:"1440x900" 60 88750 1440 1488 1520 1600 900 903 909 926 0x40 0x9 [ 11.119950] [drm:drm_mode_debug_printmodeline [drm]] Modeline 88:"1280x960" 60 108000 1280 1376 1488 1800 960 961 964 1000 0x40 0x5 [ 11.119955] [drm:drm_mode_debug_printmodeline [drm]] Modeline 81:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5 [ 11.119960] [drm:drm_mode_debug_printmodeline [drm]] Modeline 115:"1280x720" 60 74176 1280 1390 1430 1650 720 725 730 750 0x40 0x5 [ 11.119965] [drm:drm_mode_debug_printmodeline [drm]] Modeline 108:"1280x720" 50 74250 1280 1720 1760 1980 720 725 730 750 0x40 0x5 [ 11.119970] [drm:drm_mode_debug_printmodeline [drm]] Modeline 97:"1024x768" 75 78750 1024 1040 1136 1312 768 769 772 800 0x40 0x5 [ 11.119975] [drm:drm_mode_debug_printmodeline [drm]] Modeline 98:"1024x768" 70 75000 1024 1048 1184 1328 768 771 777 806 0x40 0xa [ 11.119980] [drm:drm_mode_debug_printmodeline [drm]] Modeline 99:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa [ 11.119985] [drm:drm_mode_debug_printmodeline [drm]] Modeline 100:"832x624" 75 57284 832 864 928 1152 624 625 628 667 0x40 0xa [ 11.119990] [drm:drm_mode_debug_printmodeline [drm]] Modeline 101:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5 [ 11.119995] [drm:drm_mode_debug_printmodeline [drm]] Modeline 102:"800x600" 72 50000 800 856 976 1040 600 637 643 666 0x40 0x5 [ 11.120000] [drm:drm_mode_debug_printmodeline [drm]] Modeline 89:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5 [ 11.120018] [drm:drm_mode_debug_printmodeline [drm]] Modeline 90:"800x600" 56 36000 800 824 896 1024 600 601 603 625 0x40 0x5 [ 11.120023] [drm:drm_mode_debug_printmodeline [drm]] Modeline 83:"720x576" 50 27000 720 732 796 864 576 581 586 625 0x40 0xa [ 11.120028] [drm:drm_mode_debug_printmodeline [drm]] Modeline 116:"720x480" 60 27027 720 736 798 858 480 489 495 525 0x40 0xa [ 11.120033] [drm:drm_mode_debug_printmodeline [drm]] Modeline 82:"720x480" 60 27000 720 736 798 858 480 489 495 525 0x40 0xa [ 11.120038] [drm:drm_mode_debug_printmodeline [drm]] Modeline 91:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa [ 11.120043] [drm:drm_mode_debug_printmodeline [drm]] Modeline 92:"640x480" 73 31500 640 664 704 832 480 489 492 520 0x40 0xa [ 11.120048] [drm:drm_mode_debug_printmodeline [drm]] Modeline 93:"640x480" 67 30240 640 704 768 864 480 483 486 525 0x40 0xa [ 11.120053] [drm:drm_mode_debug_printmodeline [drm]] Modeline 117:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa [ 11.120058] [drm:drm_mode_debug_printmodeline [drm]] Modeline 94:"640x480" 60 25175 640 656 752 800 480 490 492 525 0x40 0xa [ 11.120064] [drm:drm_mode_debug_printmodeline [drm]] Modeline 95:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6 [ 11.120089] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:73:HDMI-A-1] Thanks! -- Ricardo Ribalda _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
