| 21 Oct 2025 |
 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 |
| K900 | But generally it delivers | 11:54:28 |
| ElvishJerricco | there's been a few times where I saw some weird coloring that looked like compression artifacts, but the anomaly remained when I dropped to 60Hz so I'm pretty sure that means it's the software that decided to make bad colors, not DSC | 11:56:36 |
| 24 Oct 2025 |
|  seapat | 20:35:18 |
| 25 Oct 2025 |
 Makuru | Is it possible to force games that use opengl to upscale with AMD FSR 4? | 15:27:32 |
| K900 | No | 15:34:33 |
| K900 | The game needs to already support some sort of temporal upscaling solution to use FSR4 | 15:34:55 |
| K900 | Because FSR4 is itself temporal and requires motion data from the game | 15:35:09 |
| Makuru | Ahh, thanks. | 16:39:28 |
| 26 Oct 2025 |
|  Stephan joined the room. | 09:44:22 |
|  Sir_Morton joined the room. | 15:33:45 |
