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Hello everyone,
I have a problem with setting correct resolution and refresh rate on my LG CX TV.
I'm using only vanilla repositories software, updated regularly, without any custom xorg.conf or .drirc.
Hardware used:
- Asus ROG STRIX OC AMD Vega64 GPU (with 2x HDMI 2.0b)
- Club3D 10m active HDMI 2.1 cable
- no-name 3m HDMI cable
- LG OLED65CX6LA TV
- ASUS VN279Q monitor
Changing GPU outputs and cables makes no difference. Behaviour differs depending on whether I'm using Xorg or Wayland:
- on Xorg: the only available refresh rates for 4K (both in KDE settings and xrandr) are: 24Hz, 25Hz and 30Hz, audio is fine.
- on Wayland: in addition to the options above I can also see 50Hz and 60Hz modes, but when activated, both result in 'chipmunk' like audio, everything seems speed-up, voices are high-pitched, etc.
When I try to use get-edid (both as user and sudo) it results in 'nothing was successful'.
Tested on kernels: linux, linux-zen. Compositors: kwin, kwin-lowlatency. All are the same.
Audio from the monitor is fine, until I switch the TV to 4K at 60Hz on Wayland, then it also gets broken the same way.
Switching output to the TV only doesn't help (even after disconnecting monitor's DP and rebooting).
Changing both Video and Audio modes on the TV side to 'Game', 'Standard', 'Movie', etc. doesn't help.
4K & 60Hz works on Windows (same machine), so I'd assume it's not a hardware problem.
Many thanks for any help and best of luck in 2021!
Last edited by bajczyk (2021-04-25 15:02:18)
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get-edid does not seem to work anymore with modern hardware.
But you can use the data from /sys/class/drm/*/edid to pipe it into parse-edid.
My monitor:
$ sudo parse-edid < /sys/class/drm/card0-DP-1/edid
Checksum Correct
Section "Monitor"
Identifier "PL2530H"
ModelName "PL2530H"
VendorName "IVM"
# Monitor Manufactured week 41 of 2018
# EDID version 1.4
# Digital Display
DisplaySize 540 300
Gamma 2.20
Option "DPMS" "true"
Horizsync 84-84
VertRefresh 40-75
# Maximum pixel clock is 180MHz
#Not giving standard mode: 1152x720, 60Hz
#Not giving standard mode: 1280x960, 60Hz
#Not giving standard mode: 1280x1024, 60Hz
#Not giving standard mode: 1600x1200, 60Hz
#Not giving standard mode: 1680x1050, 60Hz
#Not giving standard mode: 1440x900, 60Hz
#Not giving standard mode: 1440x900, 75Hz
#Not giving standard mode: 1920x1080, 60Hz
#Extension block found. Parsing...
Modeline "Mode 16" +hsync +vsync
Modeline "Mode 0" +hsync +vsync
Modeline "Mode 1" 148.500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 2" 74.250 1920 2008 2052 2200 1080 1082 1087 1125 +hsync +vsync interlace
Modeline "Mode 3" 74.250 1280 1390 1420 1650 720 725 730 750 +hsync +vsync
Modeline "Mode 4" 27.027 720 736 798 858 480 489 495 525 -hsync -vsync
Modeline "Mode 5" 27.027 720 736 798 858 480 489 495 525 -hsync -vsync
Modeline "Mode 6" 25.200 640 656 752 800 480 490 492 525 -hsync -vsync
Modeline "Mode 7" 27.000 720 732 796 864 576 581 586 625 -hsync -vsync
Modeline "Mode 8" 27.000 720 732 796 864 576 581 586 625 -hsync -vsync
Modeline "Mode 9" 74.250 1280 1720 1760 1980 720 725 730 750 +hsync +vsync
Modeline "Mode 10" 74.250 1920 2448 2492 2640 1080 1082 1089 1125 +hsync +vsync interlace
Modeline "Mode 11" 27.027 1440 1478 1602 1716 480 484 487 525 -hsync -vsync interlace
Modeline "Mode 12" 27.027 1440 1478 1602 1716 480 484 487 525 -hsync -vsync interlace
Modeline "Mode 13" 27.000 1440 1464 1590 1728 576 578 581 625 -hsync -vsync interlace
Modeline "Mode 14" 27.000 1440 1464 1590 1728 576 578 581 625 -hsync -vsync interlace
Modeline "Mode 15" 148.500 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 17" +hsync +vsync interlace
Modeline "Mode 18" +hsync +vsync
Modeline "Mode 19" +hsync -vsync
Option "PreferredMode" "Mode 16"
EndSectionAlso what is the output of
$ xrandrBut I am afraid that in general HDMI support is not as good as with Windows or gaming consoles.
https://www.phoronix.com/scan.php?page= … Hurts-Open
Last edited by Gosi (2021-01-11 21:15:07)
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Hi,
Thanks for the tip about parsing edid directly from /sys, I wouldn't thought about it.
Here's the output for my HDMI connection:
Section "Monitor"
Identifier "LG TV SSCR"
ModelName "LG TV SSCR"
VendorName "GSM"
# Monitor Manufactured week 1 of 2020
# EDID version 1.3
# Digital Display
DisplaySize 1600 900
Gamma 2.20
Option "DPMS" "false"
Horizsync 30-135
VertRefresh 24-120
# Maximum pixel clock is 300MHz
#Not giving standard mode: 640x480, 60Hz
#Not giving standard mode: 800x600, 60Hz
#Not giving standard mode: 1024x768, 60Hz
#Not giving standard mode: 1152x864, 60Hz
#Not giving standard mode: 1280x1024, 60Hz
#Not giving standard mode: 1920x1080, 60Hz
#Extension block found. Parsing...
#WARNING: I may have missed a mode (CEA mode 95)
#DOUBLE WARNING: It's your first mode, too, so this may actually be important.
#WARNING: I may have missed a mode (CEA mode 93)
#WARNING: I may have missed a mode (CEA mode 94)
#WARNING: I may have missed a mode (CEA mode 98)
#WARNING: I may have missed a mode (CEA mode 99)
#WARNING: I may have missed a mode (CEA mode 100)
#WARNING: I may have missed a mode (CEA mode 63)
#WARNING: I may have missed a mode (CEA mode 64)
Modeline "Mode 16" +hsync +vsync
Modeline "Mode 0" +hsync +vsync
Modeline "Mode 1" +hsync +vsync
Modeline "Mode 2" 148.500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 3" 148.500 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 4" 74.250 1280 1390 1420 1650 720 725 730 750 +hsync +vsync
Modeline "Mode 5" 74.250 1280 1720 1760 1980 720 725 730 750 +hsync +vsync
Modeline "Mode 6" 74.250 1920 2008 2052 2200 1080 1082 1087 1125 +hsync +vsync interlace
Modeline "Mode 7" 74.250 1920 2448 2492 2640 1080 1082 1089 1125 +hsync +vsync interlace
Modeline "Mode 8" 27.027 720 736 798 858 480 489 495 525 -hsync -vsync
Modeline "Mode 9" 27.027 720 736 798 858 480 489 495 525 -hsync -vsync
Modeline "Mode 10" 27.000 720 732 796 864 576 581 586 625 -hsync -vsync
Modeline "Mode 11" 74.250 1920 2558 2602 2750 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 12" 74.250 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 13" 74.250 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
Modeline "Mode 14" 27.000 1440 1464 1590 1728 576 578 581 625 -hsync -vsync interlace
Modeline "Mode 15" 25.200 640 656 752 800 480 490 492 525 -hsync -vsync
Option "PreferredMode" "Mode 16"
EndSectionAnd here's my xrandr (with both screens connected):
Screen 0: minimum 320 x 200, current 5760 x 2160, maximum 16384 x 16384
DisplayPort-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
1920x1080 60.00*+ 50.00 59.94
1600x1200 60.00
1680x1050 59.95
1280x1024 75.02 60.02
1440x900 59.89
1280x960 60.00
1366x768 59.79
1280x800 60.00
1280x720 60.00 50.00 59.94
1024x768 75.03 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
720x576 50.00
720x480 60.00 59.94
640x480 75.00 72.81 66.67 60.00 59.94
720x400 70.08
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 connected 3840x2160+1920+0 (normal left inverted right x axis y axis) 1600mm x 900mm
3840x2160 30.00*+ 25.00 24.00 29.97 23.98
4096x2160 30.00 25.00 24.00 29.97 23.98
1920x1200 30.00
1920x1080 120.00 100.00 119.88 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98
1600x1200 30.00
1680x1050 30.00
1280x1024 60.02
1440x900 30.00
1360x768 60.02
1280x800 30.00
1280x720 60.00 50.00 59.94
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 60.00 59.94
640x480 60.00 59.94
720x400 70.08
HDMI-A-1 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)Offline
After hours and hours of searching for an answer for the "chipmunk" audio issue, I finally found this:
https://github.com/swaywm/sway/issues/4 … -575667151
Bottom line, find the HDR or UHD Deep Color setting on your TV and enable it for the HDMI port that your PC is connected to. Worked for me on my LG TV by going into Settings -> General -> HDMI ULTRA HD Deep Color.
I am also adding this workaround to the Arch Wiki.
Last edited by CaptainVascular (2021-04-24 00:16:38)
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After hours and hours of searching for an answer for the "chipmunk" audio issue, I finally found this:
https://github.com/swaywm/sway/issues/4 … -575667151Bottom line, find the HDR or UHD Deep Color setting on your TV and enable it for the HDMI port that your PC is connected to. Worked for me on my LG TV by going into Settings -> General -> HDMI ULTRA HD Deep Color.
I am also adding this workaround to the Arch Wiki.
Yes, that worked for me as well! Now I have both 4K@60Hz and working audio - thank you!
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