Laptop Mode Tools 1.73

Laptop Mode Tools: Power Savings Tool for Linux

 Posted on January 11, 2020  |  4 minutes  |  743 words  |  Ritesh Raj Sarraf

Laptop Mode Tools 1.73 I am pleased to announce the release of Laptop Mode Tools version 1.73 This release includes many bug fixes. For user convenience, 2 command options have been added. rrs@priyasi:~$ laptop_mode -h **************************** Following user commands are understood status : Display a Laptop Mode Tools power savings status power-stats : Display the power statistics on the machine power-events : Trap power related events on the machine help : Display this help message (--help, -h) version : Display program version (--version, -v) **************************** 15:22 ♒ ॐ ☺ 😄 rrs@priyasi:~$ sudo laptop_mode status [sudo] password for rrs: Mounts: /dev/mapper/nvme0n1p4_crypt on / type btrfs (rw,noatime,compress=zstd:3,ssd,space_cache,autodefrag,subvolid=5,subvol=/) /dev/nvme0n1p3 on /boot type ext4 (rw,relatime) /dev/nvme0n1p1 on /boot/efi type vfat (rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=ascii,shortname=mixed,utf8,errors=remount-ro) /dev/fuse on /run/user/1000/doc type fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000) Drive power status: Cannot read /dev/[hs]d[abcdefgh], permission denied - /usr/sbin/laptop_mode needs to be run as root (NOTE: drive settings affected by Laptop Mode cannot be retrieved. [Read More]
Linux  Laptop Mode Tools  Power Savings 

User Mode Linux 5.2

 Posted on October 17, 2019  |  4 minutes  |  690 words  |  Ritesh Raj Sarraf

User Mode Linux 5.2 User Mode Linux version 5.2 has been uploaded to Debian Unstable and will soon be available on the supported architectures. This upload took more time than usual as I ran into a build time failure caused by newer PCAP library. Thanks to active upstream developers, this got sorted out quick. In the longer run, we may have a much better fix for it. What is User Mode Linux a. [Read More]
Linux  Virtualization  UML  User Mode Linux 

Bpfcc New Release

 Posted on October 14, 2019  |  3 minutes  |  536 words  |  Ritesh Raj Sarraf

BPF Compiler Collection 0.11.0 bpfcc version 0.11.0 has been uploaded to Debian Unstable and should be accessible in the repositories by now. After the 0.8.0 release, this has been the next one uploaded to Debian. Multiple source respositories This release brought in dependencies to another set of sources from the libbpf project. In the upstream repo, this is still a topic of discussion on how to release tools where one depends on another, in unison. [Read More]
Linux  BCC  BPFCC  Tracing  eBPF 

Cross Architecture Linux Containers

 Posted on July 19, 2019  |  9 minutes  |  1827 words  |  Ritesh Raj Sarraf

Linux and ARM With more ARM based devices in the market, and with them getting more powerful every day, it is more common to see more of ARM images for your favorite Linux distribution. Of them, Debian has become the default choice for individuals and companies to base their work on. It must have to do with Debian’s long history of trying to support many more architectures than the rest of the distributions. [Read More]
Linux  Containers  systemd  systemd-nspawn  Qemu  Virtualization  Docker 

Linux Desktop Usage 2019

 Posted on March 15, 2019  |  6 minutes  |  1167 words  |  Ritesh Raj Sarraf

If I look back now, it must be more than 20 years since I got fascinated with GNU/Linux ecosystem and started using it. Back then, it was more curiosity of a young teenager and the excitement to learn something. There’s one thing that I have always admired/respected about Free Software’s values, is: Access for everyone to learn. This is something I never forget and still try to do my bit. [Read More]
Desktop  KDE  GNOME  Linux  Integration 

Laptop Mode Tools 1.72

 Posted on February 1, 2018  |  2 minutes  |  364 words  |  Ritesh Raj Sarraf

What a way to make a gift! I’m pleased to announce the 1.72 release of Laptop Mode Tools. Major changes include the port of the GUI configuration utility to Python 3 and PyQt5. Some tweaks, fixes and enhancements in current modules. Extending {black,white}list of devices to types other than USB. Listing of devices by their devtype attribute. A filtered list of changes is mentioned below. For the full log, please refer to the git repository. [Read More]
Laptop Mode Tools  power saving  linux 

Freezing of tasks failed

 Posted on December 28, 2017  |  3 minutes  |  537 words  |  Ritesh Raj Sarraf

It is interesting how a user-space task could lead to hinder a Linux kernel software suspend operation. [11735.155443] PM: suspend entry (deep) [11735.155445] PM: Syncing filesystems ... done. [11735.215091] [drm:wait_panel_status [i915]] *ERROR* PPS state mismatch [11735.215172] [drm:wait_panel_status [i915]] *ERROR* PPS state mismatch [11735.558676] rfkill: input handler enabled [11735.608859] (NULL device *): firmware: direct-loading firmware rtlwifi/rtl8723befw_36.bin [11735.609910] (NULL device *): firmware: direct-loading firmware rtl_bt/rtl8723b_fw.bin [11735.611871] Freezing user space processes ... [11755.615603] Freezing of tasks failed after 20. [Read More]
linux  swsusp  suspend  power saving 

Fixing Hardware Bugs

 Posted on April 4, 2017  |  9 minutes  |  1709 words  |  Ritesh Raj Sarraf

Bugs can be annoying. Especially the ones that crash or hang and do not have a root cause. A good example of such annoyance can be kernel bugs, where a faulty hardware/device driver hinders the kernel’s suspend/resume process. Because, as a user, while in the middle of your work, you suspend your machine hoping to resume your work, back when at your destination. But, during suspend, or during resume, randomly the bug triggers leaving you with no choice but a hardware reset. [Read More]
Lenovo  linux  usb  Realtek 

Linux IO + Memory + CPU Contention

 Posted on February 26, 2016  |  1 minutes  |  165 words  |  Ritesh Raj Sarraf

I very recently met someone, and we had a good productive discussion on the features and (long standing) bugs of the Linux kernel. No doubt, Linux is the most featureful kernel in the market. Is also a lot appealing given its breadth of platform support. Of that discussion we had, it led about Linux’s behavior in tighter stressed scenarios where there is a lot of contention among the core subsystems. From the conversation, I got the feedback that perhaps the issue is no more valid. [Read More]
linux  memory  block  cpu  contention 

Linux Desktop in 2014

 Posted on December 26, 2014  |  7 minutes  |  1348 words  |  Ritesh Raj Sarraf

We are almost at the end of 2014. While 2014 has been a year with many mixed experiences, I think it does warrant one blog entry ;-) Recently, I’ve again started spending more time on Linux products / solutions, than spending time focused on a specfic subsystem. This change has been good. It has allowed me to re-cap all the advancements that have happened in the Linux world, umm… in the last 5 years. [Read More]
linux  kernel  desktop  linux containers