| === JanC is now known as Guest15498 | ||
| === JanC_ is now known as JanC | ||
| chewey | I have a 4096x2160 display connected to a Skylake-driven Displayport – but I can only set a meximum resolution of 3840x2160 in Ubuntu Mate 16.04, even using the 4.6 drm-intel-next kernel. Any idea about where I could kick it? | 19:41 |
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| chewey | Also: 60Hz would be nice :) | 19:41 |
| JanC | chewey: that's a Skylake limitation, I think? | 20:36 |
| JanC | although apparently it should *just* be possible | 20:37 |
| JanC | chewey: what Skylake do you have? some have 3840x2160@60Hz as max. resolution | 20:44 |
| chewey | JanC: i7-6700 – and no, it's not the hardware, the Ubuntu installer from USB came up with the right resolution. I couldn't login after installation though, due to no login screen ;-) | 20:46 |
| JanC | oh, that one should be able to do it indeed | 20:46 |
| JanC | it's (mostly?) mobile processors that are limited, I think | 20:47 |
| JanC | and if the installer / live CD got it right, then that's really strange | 20:48 |
| chewey | I never quite understood the Linux graphics stack, too many layers… – I don't really know where to start. | 20:49 |
| JanC | chewey: did you try changing the resolution with xrandr ? | 20:49 |
| chewey | Jup. Bad idea: Blank screen with the monitor complaining about "signal out of range". | 20:49 |
| chewey | If I had never seen it working, I would suspect cables/interfaces/whatever – but I've seen it, so it is the software somehow. | 20:51 |
| JanC | signal out of range usually means combination of resolution and screen refresh rate are too high | 20:53 |
| JanC | or maybe combined with bits/pixel | 20:54 |
| JanC | should be 24bpp probably | 20:55 |
| chewey | Something like that, yes. I see the same message if I set 60Hz on the working 3840x2160. | 20:55 |
| chewey | So I'm running 3840x2160@30Hz at the moment. Meh. | 20:55 |
| JanC | I think DisplayPort also supports 30bpp (10 bits instead of 8 bits for each of R, G & B), which would require extra bandwidth of course | 21:00 |
| JanC | and I'm not sure if audio also counts | 21:00 |
| JanC | or the DRM crap | 21:03 |
| JanC | chewey: maybe comparing output of "xrandr --query --verbose" on the live CD vs. on the installed system shows something? | 21:09 |
| chewey | Good idea! – I'll try that on the next reboot. | 21:10 |
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