| 21 Oct 2025 |
 K900 | Is there a link speed setting or something? | 21:11:34 |
 Luke | I have not seen one that would obviously contribute to this, but let me search around in the settings a bit | 21:12:06 |
| Luke | Turning on "Dual-Mode" does this lmao:
swaymsg -t get_outputs
Output DP-3 'LG Electronics LG ULTRAGEAR+ 405NTEPBJ284' (focused)
Current mode: 1920x1080 @ 120.041 Hz
Power: on
Position: 0,0
Scale factor: 1.000000
Scale filter: nearest
Subpixel hinting: unknown
Transform: normal
Workspace: 1
Max render time: off
Adaptive sync: disabled
Allow tearing: no
Available modes:
1920x1080 @ 120.041 Hz
1920x1080 @ 240.084 Hz
1920x1080 @ 120.000 Hz (16:9)
1920x1080 @ 119.880 Hz (16:9)
1920x1080 @ 60.000 Hz
1920x1080 @ 60.000 Hz (16:9)
1920x1080 @ 59.940 Hz (16:9)
1280x1024 @ 75.025 Hz
1280x720 @ 60.000 Hz
1280x720 @ 60.000 Hz (16:9)
1280x720 @ 59.940 Hz (16:9)
1024x768 @ 60.004 Hz
800x600 @ 60.317 Hz
720x480 @ 60.000 Hz (16:9)
720x480 @ 59.940 Hz (16:9)
640x480 @ 60.000 Hz (4:3)
640x480 @ 59.940 Hz
640x480 @ 59.940 Hz (4:3)
| 21:13:23 |
| K900 | Yeah I'm guessing "dual mode" switches it to 1080p with a higher refresh rate | 21:14:04 |
| K900 | Except it's still not running at the right link rate | 21:14:19 |
| Luke | Ah getting a little closer:
$ swaymsg -t get_outputs
Output DP-3 'LG Electronics LG ULTRAGEAR+ 405NTEPBJ284' (focused)
Current mode: 3840x2160 @ 119.999 Hz
Power: on
Position: 0,0
Scale factor: 1.000000
Scale filter: nearest
Subpixel hinting: unknown
Transform: normal
Workspace: 1
Max render time: off
Adaptive sync: disabled
Allow tearing: no
Available modes:
3840x2160 @ 119.999 Hz
3840x2160 @ 95.033 Hz
3840x2160 @ 59.997 Hz
2560x1440 @ 143.973 Hz
1920x1200 @ 119.999 Hz
1920x1080 @ 143.981 Hz
1920x1080 @ 120.000 Hz (16:9)
1920x1080 @ 119.880 Hz (16:9)
1920x1080 @ 60.000 Hz
1920x1080 @ 60.000 Hz (16:9)
1920x1080 @ 59.940 Hz (16:9)
1600x1200 @ 119.999 Hz
1680x1050 @ 119.999 Hz
1280x1024 @ 75.025 Hz
1440x900 @ 119.999 Hz
1280x800 @ 119.999 Hz
1280x720 @ 60.000 Hz
1280x720 @ 60.000 Hz (16:9)
1280x720 @ 59.940 Hz (16:9)
1024x768 @ 60.004 Hz
800x600 @ 60.317 Hz
720x480 @ 60.000 Hz (16:9)
720x480 @ 59.940 Hz (16:9)
640x480 @ 60.000 Hz (4:3)
640x480 @ 59.940 Hz
640x480 @ 59.940 Hz (4:3)
| 21:16:48 |
| Luke | This was an input compatibility setting | 21:17:08 |
| Luke | I changed it from 1.4(DSC) to 1.4 - think this is the DisplayPort version? | 21:17:55 |
| K900 | Yes | 21:19:04 |
| K900 | Though it's strange that turning DSC off seemingly makes it work better | 21:19:14 |
| Luke | Yeah I am a bit baffled | 21:19:24 |
| K900 | DSC is Display Stream Compression | 21:19:25 |
| Luke | Uh, GPU may not support it? | 21:19:36 |
| Luke | Old GPU | 21:19:40 |
| Luke | Well at least we have hit 120Hz - only halfway to go until it's running as specified | 21:20:20 |
| K900 | It should support it | 21:20:45 |
| Luke | Or I guess halfway there? | 21:20:46 |
| K900 | DSC is baseline for DP 1.4 | 21:20:49 |
| K900 | Generally | 21:20:52 |
 ElvishJerricco | isn't there a DP 1.4a or something that very slightly upgraded DSC? | 21:21:18 |
| Luke | Radeon VII does not seem to support DSC | 21:21:51 |
| K900 | Vega has 1.4a | 21:22:14 |
| Luke | Oh wait maybe it does | 21:22:16 |
| Luke | lol | 21:22:18 |
| Luke | Looking at the wrong specs | 21:22:23 |
| K900 | It definitely should | 21:22:40 |
| ElvishJerricco | (btw, is there a way to tell from linux whether DSC is in use? I've never been able to figure that out) | 21:22:41 |
| K900 | It is a very very slightly upgraded Vega | 21:22:53 |
| Luke | Basically a compute card with outputs strapped to it lol | 21:24:13 |
| K900 | Eh, Vega was a perfectly capable gaming GPU as well | 21:26:15 |
