After a year of operation, I got increasingly disturbed by the high noise level of my Lenovo Ideapad Z565. Not sure whether it was that loud all the time, I started to pay more and more attention to the fan. The fan operation is controlled by the second button from the right in the row of system buttons in the upper right corner of the keyboard. The fan control button provides three options: Even in silent mode, the fan got very noisy. When my system started to turn off without warning under heavy computational load, I observed that the air flow at the fan exit in the rear left corner of the laptop was a gentle breeze of hot air only. It soon became clear that it was by far too gentle to effectively get rid of the heat energy. Finally I decided to have a closer look at the fan itself. The following documents how I accessed the fan of my Lenovo Ideapad Z565. Before dismantling the laptop’s cover, unplug all power supply, remove the battery and check with your warranty conditions!

You will find detailed instructions in Lenovo’s Ideapad Z560/Z565 Hardware Maintenance Manual in section 1070 on page 41. After removing the fan, the reason for the noisy fan and ineffective cooling soon became clear. A heat conductive copper construction redirects heat energy from the center part of the motherboard to the heat fins, that are placed between the fan and the air outlet of the cooling system. These heat fins are very narrow – too narrow as it was clear by now – and dirt and dust accumulated in the heat fins. These blocked in consequence the air flow and heat energy could not dissipate from the laptop. Cleaning the heat fins and their surroundings with a vacuum cleaner at lowest power removes the dust effectively. Mounting the fan back at its original position with the three screws and fixing the back cover reassembles the laptop. It will be much more silent now and will operate more stable under heavy computational load. The Lenovo Ideapad Z565’s air ventilation system is poor design.

The final heat fins are the most narrow part of the pipeline. Dust and dirt accumulate on the way out and prevent a dissipation of the heat energy. A better filtering system at the air inlets would protect the system from pollution and would be easier accessible for maintenance at the same time. Moreover, I was surprised to learn that the noise is not caused by the fan itself but by the air passing through the heat fins.Lenovo Thinkpad CPU suddenly overheating frequentlybest buy bosch vacuum cleaners Can't find your answer ? best way to clean cat pee off couchA recently uncovered feature – which had been swept under the rug – allowed new Lenovo laptops to use new Windows features to install the company’s software and tools even if the computer was wiped.best way to clean brazilian wood floors

The oddity was first noted by Ars Technica forum user ‘ge814‘ and corroborated by Hacker News user ‘chuckup.’ “The most awesome stage”Last year, Facebook's VP of Design thought the TNW Conference main stage was the best she'd ever been on.The users discovered the issue in May when using a new Lenovo laptop that automatically and covertly overwrote a system file on every boot, which downloaded a Lenovo updater and installed software automatically, even if Windows was reinstalled from a DVD.air duct cleaning miami florida The only problem is that nobody actually asked for this software, and it persisted between clean installs of Windows. best handheld vacuum cleaner nzLenovo was essentially exploiting a rootkit on its own laptops to ensure its software persists if wiped.couch cleaner machine rental

The mechanism triggering this is called the Lenovo Service Engine, which downloads a program called OneKey Optimizer used for “enhancing PC performance by updating firmware, drivers and pre-installed apps as well as “scanning junk files and find factors that influence system performance.” It also sends “system data to a Lenovo server to help us understand how customers use our products” but the company claims it’s not “personally identifiable information.” The problem is, users have no idea this is going on and it was very hard to get rid of. If Windows 7 or 8 is installed, the BIOS of the laptop checks ‘C:\Windows\system32\autochk.exe’ to see if it’s a Microsoft file or a Lenovo-signed one, then overwrites the file with its own. Then, when the modified autochk file is executed on boot, another two files LenovoUpdate.exe and LenovoCheck.exe are created, which set up a service and download files when connected to the internet. Lenovo already quietly fixed part of the bug but didn’t exactly make it loud and clear.

In a July 31 security bulletin it vaguely refers to a vulnerability found in the Lenovo Service Engine that found a way attackers could exploit the mechanism by using a malicious server to install software. The company issued a patch to remove the functionality altogether between April – May of 2015, though it requires manual execution to disable the functionality. Users do not appear to receive it automatically. Here’s the kicker: the mechanism Lenovo was using is actually a Microsoft sanctioned technique, called the “Windows Platform Binary Table” first introduced in November 2011 and updated for the first time in July of this year. The document had only two mentions online before today, one from an apparent Lenovo software engineer asking for help tinkering with laptop ACPI tables. The feature allows computer manufacturers to push software for installation from the BIOS to the system, meaning it’ll persist between installations of Windows regardless of it’s a clean installation or not.

The document was modified upon discovery of the Lenovo exploit to say that it exists to allow “critical software” like “anti-theft software” to persist across reinstallation of operating systems, but obviously computer manufacturers like Lenovo have a different idea of what that actually means (see also: the time Lenovo installed software that hijacked secure internet traffic). Manufacturers are obligated to ensure that the mechanism can be updated if an attack is discovered and should be removable by the user, but the rules outlined in the document are fairly loose and don’t require the OEM to notify the owner of the laptop that such a mechanism is in place. Both users reported being confused about how Lenovo software was installed on their computers after performing an installation from a DVD. A wide range of Lenovo laptops are affected by the issue:  Flex 2 Pro-15/Edge 15 (Broadwell/Haswell models), Flex 3-1470/1570/1120, G40-80/G50-80/G50-80 Touch/V3000, S21e, S41-70/U40-70, S435/M40-35, Yoga 3 14, Yoga 3 11, Y40-80, Z41-70/Z51-70 and Z70-80 / G70-80.

The revelation is one that makes me slightly nervous: a truly clean, untouched install of Windows is now very difficult to achieve and computer manufacturers are quietly installing software without user knowledge. Other manufacturers could have been using the technique without user knowledge, but it’s unclear at this time. At least there’s good news: if you own one of these laptops you can disable the feature right now by downloading the utility at this link. The bad news: it wasn’t already done for you. When we asked Lenovo for comment, they directed us back to the bulletin that describes the patch. Microsoft is yet to respond with a comment. It’s worth noting that almost all computers execute the autochk.exe file on boot, with an extensive white paper published earlier this year on the technique — this is just the first time we’ve seen it in action. If you have an affected laptop, let us know in the comments. We’d love to talk to you. The evil A to Z of Google and Alphabet: A look at our horrifying future