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Linux 4.20-rc3 Kernel Released

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  • Linux 4.20-rc3 Kernel Released

    Phoronix: Linux 4.20-rc3 Kernel Released

    Linus Torvalds just announced the release of Linux 4.20-rc3 as his weekly test release update to the in-development Linux 4.20...

    http://www.phoronix.com/scan.php?pag...0-rc3-Released

  • #2
    Hopefully 4.20 is more stable than 4.19 because I had a hell of a time with systems failing all over until I reverted everything back to 4.18.

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    • #3
      Originally posted by linner View Post
      Hopefully 4.20 is more stable than 4.19 because I had a hell of a time with systems failing all over until I reverted everything back to 4.18.
      Yes, my system crashes so quickly that no logs are created at all. There's nothing in journalctl, and not even an Xorg log. I have a Sapphire Nitro R9 390 and there's something wrong with amdgpu in the 4.19.x kernel. It boots fine if I don't set amdgpu.cik_support=1, but then I can't use Vulkan. I've tried everything but once I enable amdgpu the system just locks up immediately at boot.

      I backed up my system and did a clean test install just in case it was something in my setup but it acted the same way on the new install.

      I'm compiling the 4.20-rc3 kernel right now, and I'm hoping it's fixed. I've never had a kernel that crashed without creating any logs before, so I really don't know what else to do.

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      • #4
        The 19 Fedora kernel works for me. Not sure what the Fedora people have done to it, but this is on a Ryzen Mobile platform.

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        • #5
          Linux "four twenty" release candidate 3.

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          • #6
            Originally posted by muncrief View Post
            so I really don't know what else to do.
            Use the latest AMD wip kernel. Mainline kernels have very few patches and it is lottery when it works. Use the 300Hz kernel timer and xscreensaver.https://cgit.freedesktop.org/~agd5f/linux/

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            • #7
              I also had some issues with amdgpu and 4.19.1 and 4.19.2 on Raven Ridge (AMD Athlon 200ge) but 4.20-rc2 seems to work - at least for me.
              With 4.19.x (debian stretch, buster and even sid / of course latest stable /beta bios) i had blackscreens even with nomodset or other tweaks amdgpu.cik_support=0 amdgpu.dpm=1 amdgpu.dc=1 ...etc. (not sure if this is the reason but the new 18.40 firmware blobs were put upstream after 4.19 was officially released).

              How ever 4.20-rc2 is working fine for me - now I hope that STIBP mitigations are not set on by default for raven ridge or at least the performance penalty is not so high.

              Does anyone of you know the Kernel Parameter to turn of this mitigations to be on the save side?

              Could only find the flags for spectrev1, spectrev2...etc. As far as I know AMD officially recommends not to use STIBP for their Zen based CPUs.
              Last edited by CochainComplex; 11-19-2018, 03:52 AM.

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              • #8
                Originally posted by CochainComplex View Post
                How ever 4.20-rc2 is working fine for me - now I hope that STIBP mitigations are not set on by default for raven ridge or at least the performance penalty is not so high.

                Does anyone of you know the Kernel Parameter to turn of this mitigations to be on the save side?
                You can remove Spectre stuff with the kernel configuration, make xconfig is your friend. Use the latest AMD wip kernel, as you see it is lottery if mainline kernels works. How to make Debian kernel packages, see: https://www.youtube.com/watch?v=G3AxgH2bbsE

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                • #9
                  Originally posted by debianxfce View Post

                  You can remove Spectre stuff with the kernel configuration, make xconfig is your friend. Use the latest AMD wip kernel, as you see it is lottery if mainline kernels works. How to make Debian kernel packages, see: https://www.youtube.com/watch?v=G3AxgH2bbsE
                  Thx debianxfce - buiding it remotely on a nas. so make menuconfig is my friend. how is the CONFIG_xxx Line called for STIBP ? for one of the spectre eg I can set CONFIG_PAGE_TABLE_ISOLATION=n etc. But somehow I can not find the STIBP settings...maybe I'm blind. Its like opening the fridge and not beeing able to find the butter

                  Will try the wip kernel soon.

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                  • #10
                    Originally posted by muncrief View Post
                    I've never had a kernel that crashed without creating any logs before
                    Every software has bugs. Example: On one oft my SBCs every kernel below 4.19 freezes the network at random points in time. Even more funny: In the same SBC the file system (f2fs) freezes without a single log line with kernel 4.14 to 4.19 ... Kernels below 4.14 won't even boot the thing... So while your experience is different I can't use anything other than 4.20-rcX.

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