| 21 Oct 2025 |
 K900 | Except for weird compatibility reasons | 21:46:22 |
| K900 | At which point you will probably opt into them anyway | 21:46:30 |
 Luke | Fair I guess | 21:46:44 |
| K900 | I am very confused by why AMD is advertising those as DP 1.4 though | 21:46:56 |
| K900 | Because DP 1.4 is supposed to include DSC | 21:47:01 |
| Luke | I gotta try HDMI now, see what it advertises | 21:47:16 |
| K900 | It is going to be very little | 21:47:27 |
| K900 | https://trychen.com/feature/video-bandwidth | 21:47:50 |
| Luke | Oh yeah, only advertises 60Hz | 21:52:09 |
| Luke | Well, this has been an interesting lesson in display tech | 21:52:25 |
 ElvishJerricco | interesting. If this is correct, it seems the most I can get out of this 4K display without DSC is 75Hz | 22:06:36 |
| ElvishJerricco | wonder why that is. DP 1.4 can do 4K@120Hz without DSC, can't it? | 22:07:58 |
| Luke | That is what I just found out | 22:16:50 |
| Luke | My setting to disable DSC was monitor side though, perhaps yours is also not advertising the rates? | 22:18:01 |
| 22 Oct 2025 |
 Linux DADDY | You play? | 02:14:25 |
|  raphi-debug joined the room. | 10:06:25 |
 Atemu | In reply to @elvishjerricco:matrix.org
wonder why that is. DP 1.4 can do 4K@120Hz without DSC, can't it? only with 8bpp | 11:41:25 |
| Atemu | 10bpp is 97Hz max. | 11:41:57 |
| ElvishJerricco | Is the bits per pixel the same thing as the bit depth of like SDR vs HDR stuff? i.e. Does that just mean the 97Hz limit is for HDR? | 11:45:36 |
| ElvishJerricco | * Atemu: Is the bits per pixel the same thing as the bit depth of like SDR vs HDR stuff? i.e. Does that just mean the 97Hz limit is for HDR? | 11:45:49 |
| K900 | Ish | 11:47:07 |
| K900 | 10bpp is required for HDR | 11:47:12 |
| K900 | But you can do SDR 10bpp as well | 11:47:19 |
| ElvishJerricco | huh, well even at "89.98 Hz", /sys/kernel/debug/dri/0000:03:00.0/DP-1/dsc_clock_en still says it's using DSC, 10bit probably isn't the reason in this case? | 11:51:16 |
| K900 | It could be using DSC anyway just to run at a lower link rate | 11:51:40 |
| K900 | Because higher link rates are more resource intensive to run | 11:51:50 |
| ElvishJerricco | yea, and I mean it's not like it matters. IIUC almost no one can actually tell the difference between DSC on or off | 11:52:42 |
| K900 | Yeah it's designed to be "perceptually lossless" | 11:54:07 |
| K900 | Which is a very interesting choice of words | 11:54:12 |
| ElvishJerricco | lol | 11:54:21 |
