Slim Display

[Thomas Merino]

Purchasedtwo new QHD / 2K monitors. When I connect them to the display ports on the back of the docking station, the monitor gets "no signal". Interestingly enough when I open the Intel Graphics settings in Control Panel, it recognizes the two monitors, even the model #s. However both monitor lights come on as if it detects something but in the end return to amber and I see a "no signal" message. I've tried rebooting, disconnecting/reconnecting and at this point I'm stumped. The laptop has an Intel UHD 620 graphics processor so no excuses that this can't handle these monitors. Drivers all look to be up to date as well. Any advice would be greatly appreciated!

The thing you want most from a Login Manager is for it to start up quickly and disappear equally quickly. I have noticed lately that my Void Linux Display Manager ( LXDM) is taking a long time to startup. So I decided to try another Display Manager.

Simple Login Manager (SLiM) is a graphical display manager for the X Window System that can be run independently of any window manager or desktop environment. SLiM aims to be light, completely configurable, and suitable for machines on which remote login functionalities are not needed. SLiM was forked from Per Lidn's Login.app program, with contributions from Martin Parm for PAM-related classes. SLiM is currently developed by Simone Rota and Johannes Winkelmann, and is currently maintained by N...

But

It takes just as long to startup as did LXDM.

However, there are some telltale messages scrolling across the screen while it is starting up SLiM.

The messages say that it is restoring the Xfce session.

OK, the penny drops. What has been happening is that I have been having more and more complex Xfce sessions (at least 4 windows open) and Xfce is taking longer and longer to restore these sessions, each time I boot. Nothing to do with the Display manager at all.

It is interesting that old fashioned Display Manager, which uses the classic .xinitrc method of starting the DTE , gave me the critical messages which resolved my issue, while the more modern LXDM sat there for ages with a blank screen and told me nothing.

When I first installed Void, it booted very fast. After using it for some time, the display manager stage of the boot got slower. I think it is because I have Xfce loaded up with a screenful of windows, and it has to restore it.

From my point of view, being able to restore the session is the most important property of a window manager, so I shall put up with the slight delay in booting.

Hi Deby,

I agree, it was a false errand.

It is strange, the boot seems to start restoring the Xfce session, before it brings up the DM screen? Maybe it forks 2 processes? As soon as the DM screen is up and I login, the Xfce screen comes up instantly. No delay after login at all.

Gnome in Debian is entirely different. After the gdm screen and login, there is a huge delay bringing up Gnome.? And Gnome does not restore sessions.

There is an interesting sequel to this SLiM story.

Everything went well with Void/SLiM until tonight. When I booted Void tonight, it hung with the screen flashing between the DM and the boot log, and I could not login.

So what hapoened. When I look now, elogind is running. But I disabled it so runit would not start it. Therefore SLiM must start elogind itself. So I had 2 copies of elogind running, and that is what made it unstable.

My problem with it , as detailed in last post, was because Void requires you to start daemons by hand, so I thought I had to start elogind, but slim started elogind itself, so I had 2 login dae ons running.

Void is a bit unusual in several ways, but I like it. It cuts out a lot of the complex nonsense.

Neville

The behaviour at shutdown time is different. With this slim installed, I cant do shutdown from the Xfce menu as a user, I have to logout, login as root, and then Xfce will allow a shutdown.

This is different from the void package version of slim and from most other Login Managers.

Requirements for playing video on the extended monitor

CPU: Intel i5 Quad Core 3.10 GHz or above

RAM: 4 GB or higher

Higher processor recommended for multiple displays and optimal performance.

Note:

Due to constant advancements in technology we, at j5create, make it a priority to give you the latest drivers available for our products. To ensure that your device is equipped with the most current driver, please visit our driver page and install the latest driver for this model.

All trademarks and trade names may be used in this document to refer to either the entities claiming the marks and/or names or their products and are the property of their respective owners. All company, product and service names used are for identification purposes only. Use of these names, logos, and brands does not imply endorsement. We disclaim any interest in the marks of others. Learn more >

The VGA output does work. When in the BIOS there is an option for VGA Configuration under the Advanced menu but it is greyed out. Device Manager shows no missing drivers and when any of the adapters are connected they do not show as an additional monitor or display adapter.

I know it was a short time matter but thanks to everyone for the replies on this matter. As much as we wanted to stick with the display port we are going to use an USB to VGA adapter so we can get the unit back to the end user. Thanks again.

Sorry for the late response, I did not get a notification that anyone had posted. I did try just the displayport and got the same black screen; even tried rebooting the workstation and nothing changed.

No it should not. Slim is a service not a target.

The symlink to multi-user.target is probably the reason slim doesn't start. IMO you don't actually need a default.target symlink, because systemd defaults to graphical.target, which in turn "Wants" display-manager.service.

Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.

Since its discovery almost 70 years ago, the hologram has been considered to reproduce the most realistic three dimensional images without visual side effects. Holographic video has been extensively researched for commercialization, since Benton et al. at MIT Media Lab developed the first holographic video systems in 1990. However, commercially available holographic video displays have not been introduced yet for several reasons: narrow viewing angle, bulky optics and heavy computing power. Here we present an interactive slim-panel holographic video display using a steering-backlight unit and a holographic video processor to solve the above issues. The steering-backlight unit enables to expand the viewing angle by 30 times and its diffractive waveguide architecture makes a slim display form-factor. The holographic video processor computes high quality holograms in real-time on a single-chip. We suggest that the slim-panel holographic display can provide realistic three-dimensional video in office and household environments.

The holographic image and the human hand are at the same distance from the camera. It provides natural depth perception and prompts a viewer to focus on the object itself, not on the screen. The bulk-optic backlight unit is used to demonstrate the ultimate quality of the holographic image. The movie clip is available in Supplementary Movie 1.

Because of its advantage in 3D image reproduction, the technology for static holograms is quickly developed to a high standard by using hologram recording materials such as silver halide and photopolymer4. Recently, nanophotonics5 and metasurfaces6 are also used to reconstruct static holograms. However, those holographic media are non-updatable or have a limited updating frequency7, causing a fundamental limitation for generating dynamic holograms. By using a spatial light modulator (SLM), which directly modulates the wavefront of light, it is possible to update holograms at video rate. Many researches have demonstrated holographic video systems so far, including anisotropic leaky mode8 and eye tracking9. The recent study on a holographic display was reported, including a full-colour 3D computer-generated hologram (CGH) calculated in real-time, and a focus-adjustable reconstructed image10. However, it has been demonstrated that vertical parallax only holograms using a bulky optical system. It is expected to require quite an amount of time to reach the mobile holographic video for practical applications.

To build a mobile holographic video display, the following barriers need to be overcome. First of all, there is the limitation of the space-bandwidth product (SBP), which determines both the size of holographic image and the viewing angle. The static holographic media can produce large holographic images with a large viewing angle, because the information of hologram is recorded in the sub-wavelength density and it can be recorded on the large size film. However, SBP is limited by the pixel size and the number of pixels when an SLM is used as a dynamic holographic medium. The SBP of the currently available SLM is generally a few hundred times less than the SBP of the static holographic media. It means that only a small size or a narrow viewing angle dynamic hologram can be realised. Second, to generate a large coherent backlight, complicated optical components and a considerable space is required for the manipulation of light. It is difficult to realise a holographic video display as slim as flat-panel displays commercialised nowadays. Last, the calculation of hologram in real-time typically requires huge computational cost, and the amount of computation increases as the SBP increases. Several studies have been carried out to optimise algorithms and to increase computation speed, but they still require clustered processors or high-performance parallel processing systems to calculate high-quality hologram at video frame rate11,12,13,14,15,16.

3a8082e126