Upstream:
Linux 4.14: BAD
Linux 4.16: GOOD
I did not bisect to find out which CL fixed the bug.
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Title:
Cannot scale AMD Turion CPU frequency. I
I didn't try to send the patches upstream. I was hoping that someone who
already knows how to do that would pick it up.
I just searched the kernel bug database for this issue and found
https://bugzilla.kernel.org/show_bug.cgi?id=189291 . In comment #9, cthx
posted a link to this bug on 9 Dec, i.e.
Sorry, I missed the request in comment #17 to add the tag kernel-bug-
exists-upstream. Done now.
** Tags added: kernel-bug-exists-upstream
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Title:
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Changed in: linux-lts-xenial (Ubuntu)
Status: Incomplete => Confirmed
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Both patches apply cleanly to the 4.9-rc8 but I cannot build the kernel
with the configuration /boot/config-4.9.0-040900rc8-generic on my laptop
without upgrading the compiler:
Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not
supported by compiler
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Installed
linux-headers-4.9.0-040900rc8_4.9.0-040900rc8.201612051443_all.deb
linux-headers-4.9.0-040900rc8-generic_4.9.0-040900rc8.201612051443_amd64.deb
linux-image-4.9.0-040900rc8-generic_4.9.0-040900rc8.201612051443_amd64.deb
Laptop boots, bug still present:
$ uname -r
4.9.0-040900r
This patches also apply cleanly to current master in
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
with 1 line offset.
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Titl
Attaching the "alternative" patch.
** Patch added: "alternative.patch"
https://bugs.launchpad.net/ubuntu/+source/linux-lts-wily/+bug/1598312/+attachment/4788864/+files/alternative.patch
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Looks like pasting the patches directly to the editor wasn't a good
idea. It messed up the whitespace. Attaching the "revert" patch.
** Patch added: "revert.patch"
https://bugs.launchpad.net/ubuntu/+source/linux-lts-wily/+bug/1598312/+attachment/4788863/+files/revert.patch
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The revert of the offending commit does not apply cleanly to the
Ubuntu-4.4.0-47.68 kernel. The closest we can get to a revert is this
patch:
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 64f233a..aec995c 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x
3b806e2b94cad37a8809df7c86f7cfdcd3baa719 is the first bad commit
commit 3b806e2b94cad37a8809df7c86f7cfdcd3baa719
Author: Thomas Gleixner
Date: Mon Sep 14 12:00:55 2015 +0200
x86/ioapic: Force affinity setting in setup_ioapic_dest()
BugLink: http://bugs.launchpad.net/bugs/1509886
The workaround makes networking very unstable (both WiFi and wired).
4.2.0-18 is OK.
4.2.0-19 is BROKEN.
No suspicious configuration changes:
$ diff /boot/config-4.2.0-18-generic /boot/config-4.2.0-19-generic
3c3
< # Linux/x86_64 4.2.0-18-generic Kernel Configuration
---
> # Linux/x86_64 4.2.0-
Upgrading the nx6325 BIOS from F.04 to F.07 did not help, the workaround
is still necessary.
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Title:
Cannot scale AMD Turion CPU frequency. It ru
Permanently adding kernel parameters to grub config is described at
http://askubuntu.com/questions/19486/how-do-i-add-a-kernel-boot-parameter
(But it's all or nothing, so you cannot add the parameter only to one of two
dual-booting Linuxes.)
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Trying the different kernel parameters suggested at
https://wiki.ubuntu.com/DebuggingACPI I've got these results:
acpi=off: kernel panic (something too do with PCI)
acpi=ht: no change
pci=noacpi: kernel panic (something too do with PCI)
acpi=noirq: WORKS
So this is a bug in ACPI IRQ routing. Reco
Same on HP Compaq nx6325 with AMD Turion(tm) 64 X2 Mobile Technology
TL-52, including the fan running at full speed. But given the the
thermal trip points, I think the CPU frequency scaling works as
intended.
When idle, with the old kernel I see
$ uname -r
3.13.0-101-generic
$ cat /sys/devices/vi
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