[Bug 109051] intel_idle.max_cstate=1 required on baytrail to prevent crashes

[Robert Small]

Not only can I confirm that this works it makes sound stable on 4.7.3.10!

cpu0 State  Name     Disabled  Latency  Residency       Time   Usage
         0  POLL            0        0          0     139827     655
         1  C1-BYT          0        1          1  278968871  443703
         2  C6N-BYT         1      300        275     529818     620
         3  C6S-BYT         1      500        560    1498249    1034
         4  C7-BYT          0     1200       4000   42598904   11160
         5  C7S-BYT         0    10000      20000    5278866     421
cpu1 State  Name     Disabled  Latency  Residency       Time   Usage
         0  POLL            0        0          0     144568     660
         1  C1-BYT          0        1          1  262882584  325277
         2  C6N-BYT         1      300        275     200467     230
         3  C6S-BYT         1      500        560    2115466    1606
         4  C7-BYT          0     1200       4000   65103452   14633
         5  C7S-BYT         0    10000      20000    8968744     574
cpu2 State  Name     Disabled  Latency  Residency       Time   Usage
         0  POLL            0        0          0     139530     335
         1  C1-BYT          0        1          1  210700954  230724
         2  C6N-BYT         1      300        275     127452     160
         3  C6S-BYT         1      500        560    1863538     766
         4  C7-BYT          0     1200       4000   71067181   15271
         5  C7S-BYT         0    10000      20000   21625030     973
cpu3 State  Name     Disabled  Latency  Residency       Time   Usage
         0  POLL            0        0          0      36500     352
         1  C1-BYT          0        1          1  200774613  212164
         2  C6N-BYT         1      300        275     175194     287
         3  C6S-BYT         1      500        560    1765250     901
         4  C7-BYT          0     1200       4000   71643511   14947
         5  C7S-BYT         0    10000      20000   18495240    1048

cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-4.7.3.10 root=/dev/mapper/vgDrudwyn-root64 ro
i915.modeset=1 threadirqs intel_iommu=igfx_off clocksource=tsc tsc=reliable
sdhci.debug_quirks=0x10000 quiet splash

$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux stable-updates (sid)
Release: stable-updates
Codename: sid

Got a bit of a mix of stable, testing and unstable going on.

Only tested for about ten minutes so far but I found sound *so* unstable it
would actually cause the kernel to lock up on first opening of YouTube
without cstates kernel parameter.


Thanks,


*Robert Small*
 e: Robert at RobertSmall.org

On 19 September 2016 at 22:05, Paul Mansfield <paul at mansfield.co.uk> wrote:

> seems like a useful work-round
>
>
> ---------- Forwarded message ----------
> From:  <bugzilla-daemon at bugzilla.kernel.org>
> Date: 19 September 2016 at 22:02
> Subject: [Bug 109051] intel_idle.max_cstate=1 required on baytrail to
> prevent crashes
>
>
> https://bugzilla.kernel.org/show_bug.cgi?id=109051
>
> --- Comment #498 from w2q at arcor.de ---
> The script of Wolfgang Reimer seems to be a good workaround so far. A way
> to
> install this permanently is described here:
>
> https://forum.manjaro.org/t/intel-baytrail-freezes-the-
> linux-kernel/1931/10
>
> Works for manjaro and ubuntu
>
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