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Re: overcoming known kernel bug



Hey David,


Have you tried compiling your kernel from source, or researching if a certain option in the kernel config could cause this?

Interesting things to look at: Menuconfig, Kernel patches, Custom Drivers.


On 12/13/2017 02:22 PM, Brian J. Oney wrote:
Dear David,

this is different issue. My CPUs are just fine and I can use the laptop without issue. Still the my laptop whines. Downgrading, upgrading to a rolling release, or (gasp) installing windows would be running from the problem.

Ideally, a kernel shepherd would teach me to coax my sheep to calm down when being rewoke. It's bleats but does not stink, and all I have figured out to remedy this is to knock it out :-). Killing this bleating lamb is not an option.

Cheers,
Brian





On Tue, 2017-12-12 at 18:47 -0800, David Christensen wrote:
On 12/12/17 05:30, Brian Oney wrote:
I am having trouble with my 2016 lenovo thinkpad yoga 11e (3rd gen) running the current version of debian stable (stretch). The on wake-from-suspend the fan runs on high. Specifically, I have: ~ $ uname -a Linux tinkbox 4.9.0-4-amd64 #1 SMP Debian 4.9.51-1 (2017-09-28) x86_64 GNU/Linux On wake-from-suspend: ~ $ sensors thinkpad-isa-0000 Adapter: ISA adapter fan1: 6125 RPM acpitz-virtual-0 Adapter: Virtual device temp1: +65.0°C (crit = +90.0°C) The acpitz-virtual-0 pegs the temperature at 65°C and won't let it go. Therefore the fan attempts liftoff. I could attach the output of 'reportbug kernel', but the problem is known and the bug is described in: https://bugzilla.kernel.org/show_bug.cgi?id=196129 The bug is present up until it's fix in kernel 4.13.4 or something around that time. The solution is to install a much newer kernel (or downgrade). Being lazy I tried to just install the latest backported kernel (linux-image-4.13.0-0.bpo.1-amd64). That doesn't work. What I find most interesting would be to compile a slimmer, faster kernel, but I have failed (after consulting the debian kernel handbook). One thing or the other doesn't work afterwards. Also, I run out of disk space lately (15Gb is huge!) My idea was to use the old kernel configuration (with 'make olddefconfig'), but there are so many new options and I honestly have no clue how to get an overview and make an informed decision. I would report this as a low priority kernel bug but it's (far) upstream. It's also a known problem, which isn't necessarily debian's problem. I would appreciate any advice. I bought this laptop because it's tough and has a good battery. Any laptop that misbehaves on wake-from-suspend is not a very useful laptop (Imagine a meeting with a constantly whining laptop). Thanks in advance!
Debian 9 on certain laptops seems to have polling loop issues that manifest when the graphical login screen is displayed and when the screen saver is displayed. These are deal-breaker bugs that will burn up your CPU and suck your battery dry. Here's the bug report for my Dell Inspiron E1505/6400: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878313 The fact that it has been ignored for 2 months is not encouraging. My work-around has been to pull the battery, plug in the power adapter, run: cpufreq-set -g powersave to minimize heating/ damage when I log out/ screen lock, and run: cpufreq-set -g ondemand when I log in. I read a post somewhere that someone had found a way to muck with configuration settings and make at least some of the problems go away, but I don't have that URL. Looking at the Debian Testing kernel packages, it doesn't look like Testing includes the bug fixes you mention (?): https://packages.debian.org/testing/kernel/ Ideas: 1. Go older -- e.g. Debian 8 or Debian 7. 2. Go bleeding edge -- e.g. Debian Unstable, Fedora, or Arch. 3. Run Windows and a hypervisor. David

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