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Linux 4.15-rc1 Kernel Released

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  • Linux 4.15-rc1 Kernel Released

    Phoronix: Linux 4.15-rc1 Kernel Released

    While when releasing Linux 4.14 Linus Torvalds mentioned 4.15-rc1 might be delayed due to his US holiday travels, Linux 4.15-rc1 has been released on time to conclude the two week merge window process...

    http://www.phoronix.com/scan.php?pag...5-RC1-Released

  • #2
    here we go https://lkml.org/lkml/2017/11/26/187

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    • #3
      Just upgraded, performance in actual OpenGL applications seems to be fine, but I noticed I couldn't even move windows around smoothly. Apparently this broke vsync'd window management with compton (a compositor for WMs), especially the opengl-swc and opengl-mswc methods of vsync. The other methods of vsync took a huge performance hit and results in windows not being able to be moved smoothy, no problems on 4.14. I know early release candidates can be pretty buggy, I'll give it some more time and wait for rc2. Maybe some userspace packages need to be updated too.

      Using an RX460 on Arch.
      Last edited by czz0; 11-26-2017, 11:17 PM.

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      • #4
        RX480 here and 4.15-rc1 on Ubuntu 17.10 and Mesa 17.2.4 is running buttery smooth for me with the amdgpu.dc=1 setting. HDMI Audio working as well. I can't wait til FreeSync makes it in.

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        • #5
          For a non debug kernel the 4.15 kernel generates stack trace winding code and the libelf-dev package must be installed. r8168 network dkms driver fails to compile.
          Code:
          /var/lib/dkms/r8168/8.045.08/build/r8168_n.c:22967:9: error: implicit declaration of function ‘setup_timer’; did you mean ‘sk_stop_timer’? [-Werror=implicit-function-declaration]
                   setup_timer(timer, rtl8168_esd_timer, (unsigned long)dev);
                   ^~~~~~~~~~~
                   sk_stop_timer
          cc1: some warnings being treated as errors

          r8169 kernel driver works with the Asus Prime B350M-K motherboard. Tomb Raider 2013 benchmark is as fast as with kernel 4.14, avg 114 fps at fullhd normal settings.

          Code:
          [email protected]:~$ screenfetch
                   _,met$$$$$gg.           [email protected]
                ,g$$$$$$$$$$$$$$$P.        OS: Debian testing buster
              ,g$$P""       """Y$$.".      Kernel: x86_64 Linux 4.15.0-rc1
             ,$$P'              `$$$.      Uptime: 9m
            ',$$P       ,ggs.     `$$b:    Packages: 1649
            `d$$'     ,$P"'   .    $$$     Shell: bash 4.4.12
             $$P      d$'     ,    $$P     Resolution: 1920x1080
             $$:      $$.   -    ,d$$'     DE: XFCE
             $$\;      Y$b._   _,d$P'      WM: Xfwm4
             Y$$.    `.`"Y$$$$P"'          WM Theme: Galaxy
             `$$b      "-.__               GTK Theme: Xfce-cadmium [GTK2]
              `Y$$                         Icon Theme: Tango
               `Y$$.                       Font: Sans 10
                 `$$b.                     CPU: AMD Ryzen 5 1600 Six-Core @ 12x 3.088GHz [45.5°C]
                   `Y$$b.                  GPU: AMD POLARIS11 (DRM 3.23.0 / 4.15.0-rc1, LLVM 5.0.1)
                      `"Y$b._              RAM: 1574MiB / 7986MiB
                          `""""
          Last edited by debianxfce; 11-27-2017, 03:37 AM.

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          • #6
            Do SI cards benefit from amdgpu.dc=1 now or will be in the future ?

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            • #7
              debianxfce I know the timers api was refactored in 4.15, that's likely the source of your problem. Here's the patch that did the refactoring (there may be others): https://patchwork.kernel.org/patch/10074919/

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              • #8
                Originally posted by predator7 View Post
                Do SI cards benefit from amdgpu.dc=1 now or will be in the future ?
                Run make xconfig in the linux-4.15-rc1 folder and read the documentation:
                "
                DC support for Polaris and older ASICs (DRM_AMD_DC_PRE_VEGA)

                CONFIG_DRM_AMD_DC_PRE_VEGA:

                Choose this option to enable the new DC support for older asics
                by default. This includes Polaris, Carrizo, Tonga, Bonaire,
                and Hawaii.
                "

                If the amdgpu driver works with SI gpu, use the amdgpu driver. Otherwise the SI support is not developing.

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                • #9
                  Originally posted by programmerjake View Post
                  debianxfce I know the timers api was refactored in 4.15, that's likely the source of your problem. Here's the patch that did the refactoring (there may be others): https://patchwork.kernel.org/patch/10074919/
                  I do not care anymore, r8169 kernel driver works fine.

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                  • #10
                    So I just tried the spin from Ubuntus mainline repository, and DP audio from my Fury to my MG279Q is still not working unless I resample everything to 48khz.

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