On Fri, Jan 27, 2017 at 10:06:09PM +0100, deloptes wrote: > Mattia Oss wrote: > > > > > Anyway thanks for the effort, much appreciated. :) > > Perhaps you should check your plymouth install/setup. I am not ubuntu user.
[I reply here for everybody] First of all: ok, uploading to google drive wasn't a good idea. My bad, apologies. I made new videos and uploaded to youtube, I'll post the links. But first let me clarify one thing because I fear that there is a big misunderstanding here: there's no problem with the kernel per se, it doesn't hang, there are no errors. It just prints the output slowly, or at least slower than before. I *think* that's related to the framebuffer (and at this point I'm fairly certain it is, will explain later). So the point of the videos was *not* to show you the output but to show you *where* the slowdown occurs: right after the kernel starts. That's why the quality is not high (ok, maybe also because I suck making videos...). So for the ones still interested I'll post some more infos. Since the problem started with linux-image-4.8.0-2-amd64 I'll compare 4.8.0-1 and 4.8.0-2. Videos: 4.8.0-1 (fast): https://www.youtube.com/watch?v=NLWB7FyV7jU 4.8.0-2 (slow): https://www.youtube.com/watch?v=Nc1lgpdgaxQ Kernel logs: 4.8.0-1: https://github.com/maistoast/share/blob/master/kernel/log/4.8.0-1/dmesg_4.8.0-1-amd64 4.8.0-2: https://github.com/maistoast/share/blob/master/kernel/log/4.8.0-2/dmesg_4.8.0-2-amd64 This is the diff of both changelogs: https://github.com/maistoast/share/blob/master/kernel/cl/linux-image-4.8.0-amd64-changelog.linux.diff I saw some reference to radeon but I didn't find anything really useful. I tried, I think, every suggestions you all gave me. If I don't post the results it's because it didn't work. For example, plymouth (I don't have it installed), various kernel options (vga, video, splash, etc...). BUT, I made a progress. :) I installed linux-source-4.9 and compiled the kernel with the 4.8.0-1 config. The result: it boots fast! :) This is the kernel log of the custom kernel: https://github.com/maistoast/share/blob/master/kernel/log/4.9.2/dmesg_4.9.2--bymattia As you can see it uses simplefb and not vesafb. I'm quite sure that this is the problem. As Sven Joachim pointed out, the Debian devs disabled simplefb because it has problems with KMS framebuffer. Reading the link he provided they disabled the X86_SYSFB and FB_SIMPLE options to fix some bugs. I think there's no solution for me because these options are not enabled in the Debian kernel anymore.. :/ Se either I use a custom kernel, or I keep my sweet fat characters with the Debian kernel. Thanks, Mattia.
