| 24 Feb 2025 |
 Oro (any/all) | That's fair. I think upstream is hoping to get it somewhere in the 48 release cycle (whot's interested, and the string freeze exception has 1 ACK, though not sure if the latter means it has a change of getting accepted), but maybe it could be backported if/when it's merged? | 18:43:37 |
| 2 Mar 2025 |
|  Fernando joined the room. | 16:28:55 |
| Fernando | Hello, I've been playing around with Plymouth | 16:29:13 |
| Fernando | is it possible to get a smooth transition from plymouth to gdm to gnome shell? right now I get a black screen and then gnome-shell pops up after autologin | 16:29:50 |
 K900 | Depends on your hardware and display configuration | 16:30:29 |
| K900 | Generally anything involving Nvidia, or multiple displays, or X11 will require a modeset | 16:30:44 |
 emily | the technical term here is "flicker-free boot" | 16:33:38 |
| emily | it is a goal of developers of the Linux graphics and desktop stack that has been pursued for over a decade now | 16:33:54 |
| Fernando | it's amd and wayland for the matter | 16:33:58 |
| K900 | How many displays, which exact AMD, which kernel version? | 16:34:13 |
| emily | I believe if you are lucky and have a suitable setup it is possible to achieve in practice these days, but there's still caveats and tricky things | 16:34:18 |
| Fernando | so I've been playing with the KCL, and I do get a flicker-free boot from cold start into plymouth, but I'm missing the fade from plymouth into gnome-shell with autologin | 16:34:33 |
| Fernando | I can try without autologin though | 16:34:40 |
| emily | FWIW, I believe Intel drivers are the furthest ahead for this, but K900 will know more up-to-date info than me. | 16:34:44 |
| emily | my guess is that the flicker is when it switches from the EFI FB driver to amdgpu, but I could be totally off here | 16:35:33 |
| Fernando | without autologin (no gdm skip) seems to do the same: plymouth -> spinner stops -> black screen -> gdm | 16:37:25 |
| K900 | ^ | 16:37:37 |
| Fernando | How many displays: 1, which exact AMD: ryzen 7 7840U, which kernel version?: 6.13.4
| 16:39:20 |
| K900 | Try boot.initrd.kernelModules = [ "amdgpu" ] | 16:39:53 |
| Fernando | now I get no spinner and a black screen into GDM, lol | 16:42:53 |
| K900 | Then it's very likely your firmware is not setting the display to the correct mode | 16:43:57 |
| Fernando | no idea then | 16:54:07 |
| K900 | In general any sort of flicker free anything requires the early boot firmware to cooperate | 16:54:31 |
| K900 | And in general not all firmware actually does | 16:54:37 |
| K900 | This is especially often the case with high refresh rate displays | 16:55:04 |
| K900 | Because it's common for the firmware to drive them at 60Hz anyway | 16:55:14 |
| emily | it could also be that Linux isn't choosing the right mode to use, right? | 16:57:28 |
| emily | IIRC you can end up with "modes" that are basically the same but with some silly difference that means a modeset happens anyway | 16:57:47 |
| emily | I may not be helping here though. the last time I seriously tried to get a flicker-free Linux boot was in 2014 | 16:57:58 |
| emily | but I recall there were things you could do to override what Linux would try to switch to to prevent this | 16:58:09 |
