A satisfactory choice for convertible laptop buyers

April 2, 2022 0 Comments

When Lenovo launched its 40-series laptop late last year, it confused us all with its updated naming project. The yoga sub-brand, which previously stood for convertible touchscreen computing, suddenly represents premium computing. The Yoga S940 is one such example. The IdeaPad moniker, which previously stood for mid-range mainstream computing, abruptly incorporates convertible models, such as the IdeaPad C340. Now, however, the yoga sub-brand has returned to its convertible roots. Enter Lenovo Yoga C640.

At the heart sits between a mid-range convertible laptop, the Lenovo Yoga C640 more profitable IdeaPad C340 and the more expensive Yoga C740, where the Yoga C940 sits far above the top of the line. The Yoga C640 comes in a single variant at a starting price of Rs 71,818 but can be customized to order with CPU, screen and storage upgrade options. Like the IdeaPad C340, the Yoga C640 comes with a bundle of stylus for the touchscreen panel. With that, let’s take a closer look at the rest of the package.


Our Yoga C640 review unit was equipped with an Intel Core i5-10210U CPU and 8GB RAM. Storage was powered by a Samsung 512GB PCIe NVMe solid-state drive. In our standard benchmark tests, the review unit performed quite poorly, although we found its day-to-day performance to be much higher. In PCMark 8’s Accelerated Creative Test, it scored 3301 points, which is below the Asus ZenBook Flip 14 and Lenovo IdeaPad C340. This was the case with 3DMark’s Fire Strike and Sky Diver. You can read our review of Asus ZenBook Flip 14 and Lenovo IdeaPad C340 here.

This is the latest 10th Gen Core i5 CPU in Lenovo Convertible

In our daily performance tests, the review unit performed as well as I expected. I’ve been able to multitask across multiple virtual desktops across common virtual applications like Chrome, OneNote, Word, Excel, iTunes, File Explorer and WhatsApp for PC without experiencing any lag or stuttering signs. Even though the number of tabs in Chrome has risen to over thirty, the review unit has responded quite strongly. If anything, I noticed a one second break when I pressed Win + Tab to switch between the virtual desktops. Nevertheless, the review unit has proven to be a good performer for everyday computing work. What fascinated me most was the ability to enter the ‘connected sleep’ mode when the laptop lid was closed. The lock screen appeared as soon as I opened the lid with zero waiting like an Apple MacBook.

The C640’s daily performance is much better than its benchmark score

It’s important to note that the Yoga C640 Review Unit suffers from the same software bug as the ThinkBook 14 that we reviewed last year, where a background process titled ‘Lenovo.Modern.ImController.PluginHost.exe’ gets confused and stutters frequently. . Window animation. You can read about how I worked around it here. The same solution worked on the Yoga C640. If the bug persists across all modern Lenovo devices, the company should pull its socks and look at it.

Much better than the benchmark score of the C640’s graphical performance

After using it for about three weeks now, I think Lenovo Yoga C640 is a good choice for safe users who want a convertible with enough power for daily computing work. You will be able to use common applications like Word, Excel, PowerPoint and Outlook without any lag or stuttering symptoms. You’ll be able to use it for some light image editing even though it doesn’t have a separate graphics card on board. However, if you plan on running lightweight video games like your next purchase, such as Doom and Metro: Last Light, consider a model like the HP Pavilion x360, which comes with an Nvidia GeForce MX250 graphics card with 2GB of dedicated video RAM.


Thanks to the latest Intel 10th Gen CPU, the Lenovo Yoga C640 is able to prove that it is a modern connected device. In other words, it comes with excellent battery life. During one of our daily experiments, the review unit lost half of its charge in about four hours, during which time it was tasked with intense browsing at 80 percent screen brightness and full keyboard backlight brightness. What’s more, music was playing in the background through headphones in a YouTube window.

Despite having quite a low benchmark score, you can expect 9 hours of battery life on a single charge

In subsequent runs with similar parameters (less app), I noticed that the review unit loses about 10 percent of its charge per hour. Interestingly, turning off the keyboard backlight or lowering the screen brightness did not result in a significant change in the number of hours the battery operated. Sadly, it scored very poorly on our standard battery benchmark test. Its score was 3 hours, 41 minutes. Then it’s safe to say that even with its low benchmark score, you can expect a battery life of nine to ten hours on a single charge from the Yoga C640, which is quite good for a convertible laptop in this price bracket.

Display, Touch Performance, Audio and IoT

The Lenovo Yoga C640 comes with a 13.3-inch full HD IPS touchscreen display with a maximum brightness of 300 nits. The optional 400-nit panel will cost an additional Rs 485 if you want to build your own laptop on Lenovo India’s official website. The screen colors of the review unit were balanced without being over-saturated. However, the text on the screen often becomes unreadable due to the reflections caused by the outer glass panels. If you’re in an office with bright overhead lights, you’ll often find yourself tilting the display back and forth. All things considered, this is a panel suitable for casual browsing, spreadsheet editing and video watching.

The screen is bright and colorful but at first glance sensitive

The Lenovo Yoga C640 is bundled with an Active Pen stylus, which claims 4,096 levels of stress sensitivity. The touch-response tablet-mode function from the review unit’s screen was perfect for drawing and note-taking. If anything, I found the laptop’s long shape ratio a bit inconvenient for portrait-mode use because there was not enough page width to pack many words into one sentence. The auto-rotate feature was also somewhat slow to respond. All things considered, the Yoga C640 is a decent tablet though it is a much better laptop.

Touch response is also quite good

The Yoga C640 has two upward-firing speakers, on either side of each keyboard. The sound of these speakers is at best flat and inspiring. While it’s loud enough for a few short YouTube video clips inside a quiet bedroom, it’s not good when you want to watch a TV show with your friends in a busy coffee shop. The Yoga C640 is pre-installed with the Dolby Atmos app, which lets you choose from a list of sound settings and equalizer curves around the preset. You can even define your own output curve.

The top-firing speaker is a thorough disappointment

The Lenovo Yoga C640 comes with decent connectivity options. On the left side of its body, we see a proprietary round-pin power port, a USB-A 3.1 port and a 3.5mm audio jack for the headset. On the right, we see another USB-A 3.1 port and a USB-C port (with support for displayport and power delivery). There is also a small power button with decent feedback. For most modern Lenovos today, the Yoga C640 is equipped with a physical sliding shutter for added webcam privacy. This means you no longer have to stick a small tape over the webcam to ensure complete privacy. The Yoga C640 has a fingerprint scanner at the bottom of the keyboard with in-sensor authentication, which works quickly with Windows Hello for sign-in.

The ports on the left have a USB-A 3.1 port

The ports on the right have a USB-C with PD, while the Lenovo proprietary reset button is on the base panel.

The physical slider for webcam ensures peace of mind

Keyboard and touchpad

The experience of typing on Yoga C640 is acceptable but not enjoyable. The keys are properly sized and well placed but lack tenderness and travel. As a result, they feel uncomfortable and uncomfortable typing for long periods of time. Backlighting has two levels of brightness control but the first stage is completely ineffective, even in pitch darkness, effectively leaving you with an on / off switch. In short, the Yoga C640’s keyboard sometimes works well for email but not for long documents.

The keyboard offers decent performance for small emails and documents but could have been better

Despite being the correct Windows 10-certified precision unit, the Yoga C640’s touchpad pointers fail to provide adequate accuracy and linear operation. What’s more, the touchpad surface is inexplicably sticky and resistant. This means you need to maximize sensitivity and cursor speed to get an average touchpad experience. On the plus side, multi-finger taps and gestures work well out of the box, as do three-finger taps and four-finger swipes. In short, for long work sessions you are better off with a reliable mouse.

Despite being a perfect unit, the touchpad has a weird resistive feel

Construction and design

The Lenovo Yoga C640 has a compact 13-inch form factor with a built-in structure and a clean design. Its ‘sandblasted aluminum cover’ provides a good amount of structural strength and grip. The base panel, including the keyboard island, has a grippy, lovely soft-touch finish similar to the 15-inch Dell XPS. At 1.25kg, the Yoga C640 is quite light. What’s more, the laptop’s relatively compact power brick is designed to fit directly into a wall socket, reducing cable clutter.

The Yoga C640 is definitely a visitor

The laptop lid is open, which fortunately reveals a 13.3-inch display with one-handed operation, a glossy finish. The side bezels are quite thin though the same cannot be said for the upper and lower bezels. Although the Yoga C640 is bundled with an Active Pen stylus, it does not have a storage silo on board. This means you have to carry the stylus with you in your person or in your bag. Nevertheless, the Lenovo Yoga C640 is well made and designed for the price.

It is both well built and designed

The last row

Compared to the more affordable IdeaPad C340, the Yoga C640 comes as a more polished device with a better fit and finish. Thanks to its slightly smaller 13.3-inch display, it is more compact and lighter in weight. But more than anything else, it’s the freshest on the market. The Intel 10th Gen chip offers both performance and efficiency inside, which means you can easily expect more than eight hours of unplugged performance. It can also play the role of a Windows tablet, although it is more comfortable than a conventional slim and light laptop.

The Lenovo C640 is probably best known for its good battery life

Where the Lenovo Yoga C640 falls short is in daily use. Its keyboard and touchpad setup isn’t exactly comfortable, which means you’ll be able to work faster, a ThinkPad (commonly known for its keyboard quality) or an Apple MacBook (generally known for its touchpad accuracy). To add to that, the Yoga C640 has an awesome set of speakers for video and audio playback. Priced at Rs 78,590, if these details don’t bother you, the Lenovo Yoga C640 is a fine convertible laptop for everyday work and entertainment.

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