Kernel 6.8 RC (Release Candidate) series

[Doug S]

Kernel 6.8-rc7 is available. The patch for the issue I detailed in post #9 above is included. See commit:

f0a0fc10abb0 cpufreq: intel_pstate: fix pstate limits enforcement for adjust_perf call back

...Interesting... I am getting a couple of errors compiling the kernel.

EDIT: The compile issue is a function of GCC version, as determined in this thread (see the end).

Indeed it compiles fine when I boot my test server as 24.04, but not when it is booted as 20.04:
gcc (Ubuntu 9.4.0-1ubuntu1~20.04.2) 9.4.0" -> "gcc (Ubuntu 13.2.0-13ubuntu1) 13.2.0

[corradoventu]

But 6.8 is already arrived in Ubuntu Noble:

corrado@corrado-n2-nn-0220:~$ inxi -Scx
System:
  Host: corrado-n2-nn-0220 Kernel: 6.8.0-11-generic arch: x86_64 bits: 64
    compiler: gcc v: 13.2.0
  Desktop: GNOME v: 45.3 Distro: Ubuntu 24.04 (Noble Numbat)
corrado@corrado-n2-nn-0220:~$

[Doug S]

But 6.8 is already arrived in Ubuntu Noble:

Yes, but it is still only at the RC (Release Candidate) level upstream.

[Doug S]

Kernel 6.8 has been released.

The issue I mentioned in post #21 above has been fixed and I am able to compile the kernel under the version of the gcc compiler used in Ubuntu 20.04.

doug@s19:~$ uname -a
Linux s19 6.8.0-stock #1245 SMP PREEMPT_DYNAMIC Sun Mar 10 16:29:09 PDT 2024 x86_64 x86_64 x86_64 GNU/Linux

EDIT: I don't know why the Ubuntu mainline PPA version never showed up. The daily log says "No space left on device".

[TenPlus1]

Using 6.8.0-060800rc7 kernel and while scrolling websites it will randomly blank screen for 3 seconds then re-appear, only happens once and journalctl shows this error :-

Mar 13 09:46:13 ThinkPad-P14s-Gen-2a rtkit-daemon[912]: Successfully made thread 4974 of process 3135 ow>
Mar 13 09:46:13 ThinkPad-P14s-Gen-2a rtkit-daemon[912]: Supervising 7 threads of 4 processes of 1 users.
Mar 13 09:47:12 ThinkPad-P14s-Gen-2a kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring vcn_dec tim>
Mar 13 09:47:12 ThinkPad-P14s-Gen-2a kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process informat>
Mar 13 09:47:12 ThinkPad-P14s-Gen-2a kernel: amdgpu 0000:06:00.0: amdgpu: GPU reset begin!
Mar 13 09:47:13 ThinkPad-P14s-Gen-2a kernel: [drm] Register(0) [mmUVD_POWER_STATUS] failed to reach valu>
Mar 13 09:47:13 ThinkPad-P14s-Gen-2a kernel: [drm] Register(0) [mmUVD_RBC_RB_RPTR] failed to reach value>
Mar 13 09:47:13 ThinkPad-P14s-Gen-2a kernel: [drm] Register(0) [mmUVD_POWER_STATUS] failed to reach valu>

[fyfe54]

Kernel 6.8 has been released.

Now available in Mainline.

[Doug S]

Kernel 6.8 has been released.

Now available in Mainline.

Oh, Thanks. Finally.

I see that "generic" has finally moved to 1000Hz. In my opinion, this is huge news, and about time:

doug@s19:~/kernel/linux$ scripts/diffconfig .config-6.8.0-060800rc7-generic .config-6.8.0-060800-generic
-GCC11_NO_ARRAY_BOUNDS y
-TICK_CPU_ACCOUNTING y
 CC_VERSION_TEXT "x86_64-linux-gnu-gcc-13 (Ubuntu 13.2.0-16ubuntu1) 13.2.0" -> "x86_64-linux-gnu-gcc-13 (Ubuntu 13.2.0-17ubuntu2) 13.2.0"
 CONSOLE_LOGLEVEL_QUIET 4 -> 3
 HZ 250 -> 1000
 HZ_1000 n -> y
 HZ_250 y -> n
 LATENCYTOP n -> y
 NO_HZ_FULL n -> y
 NO_HZ_IDLE y -> n
 VIRT_CPU_ACCOUNTING_GEN n -> y
+CONTEXT_TRACKING_USER y
+CONTEXT_TRACKING_USER_FORCE n
+GCC10_NO_ARRAY_BOUNDS y
+RCU_LAZY y
+RCU_NOCB_CPU y
+RCU_NOCB_CPU_DEFAULT_ALL n
+VIRT_CPU_ACCOUNTING y

[corradoventu]

For the change HZ 250 -> 1000 see:
https://discourse.ubuntu.com/t/enabl...or-24-04/42255