Driver 2 Controls

[Yufei Labbe]

HelloI am new to Jetson Nano and V4L2 Driver Development in general. I have written a working V4L2 camera driver for another Linux platform. While porting to Jetson Nano I came up with 2 questions I have not found an answer for in the examples. If I was missing something, please let me know :)

While porting I was using your guide on how to implement the driver with tegracam. So I am using 2.0. Since I am using monochrome sensor I am not using your ISP with gstreamer, instead I use v4l2 C-API in my own C++ application I am writing. I mostly used the v4l2-cuda example for that.

How should I implement custom V4L2 controls using tegracam. For example I want to set top/left readout offset values for my camera. Should I change the tegracam files, or should I add another custom control handler from my driver? How to make it compatible with tegracam 2.0 driver development?

moreover,

if you would like to extend your customize CID controls,

please adding specific CID flags to tegra-v4l2-camera.h,

you should also have implementation in the VI drivers, channel.c.

thanks

How does it behave if there are multiple user accounts on the computer and any of them can be on at any time? It seems we need it running on each account. Anyway around that? Once it is on, it needs to be logged into an account that has the utility running to then turn it back off.

FYI, I have other drivers that include WOL functionality: LAN Device Monitor, and Virtual WOL Switch. So if this driver is more than what you really need you might want to look into either of those. LAN Device Monitor also monitors device states that support UPnP. Virtual WOL Switch is just a simple switch that can be controlled from Alexa.

I had a similar issue and actually another issue. Every time I tried to discover a device it would create a new device. Then when I was trying to add my Hue Hub instead of waiting for my Hue to connect it would create 2 devices and say it was successful for Hue. I had to remove the driver to connect my Hue hub.

Sounds awesome. Ill try today if the wake up function works with my fileserver just with the MAC/IP information, but it would be nice to also have the sleep option which I now have to do via SSH.

I installed this to 2 of my windows computers and damn its nice to shutdown TV, AV and put my HT-PC to sleep with single button of TV:s remote

My other computer (connected ethernet) works fine but my other computer (connected WLAN) seems to wake up every time from sleep when monitoring fetches device status. When I turn monitor enable to off my computer doesnt wake randomly anymore. Ive turned only allow magic packet to wake option on in windows and also tried to disable wake on pattern match but they didnt affect to problem.

Either the display miniport driver or the ACPI methods exposed by the system basic input/output system (BIOS) can support changing the brightness of an integrated display panel. For the first video target that is marked as having output technology that connects internally in a computer (D3DKMDT_VOT_INTERNAL), the monitor driver calls the display miniport driver's DxgkDdiQueryInterface function to query for both of the following:

If the display miniport driver doesn't support at least the Brightness Control Interface, the monitor driver uses ACPI to query for the _BCL, _BCM, and _BQC methods on the child device. For more information about these methods, see the ACPI specification on the ACPI website.

In the Windows Display Driver Model (WDDM), an ACPI identifier is not used to identify an integrated display panel. This is different from the Windows 2000 Display Driver Model, which supports only display panels with an identifier of 0x0110.

If either the display miniport driver or BIOS-exposed ACPI methods support brightness controls, the monitor driver registers for ACPI notifications of brightness shortcut keys. No alternative mechanism exists to signal the monitor driver about shortcut key notifications. If the monitor driver can't use either brightness-control mechanism or if the display miniport driver supplies the brightness control interface but fails a call to the DxgkDdiGetPossibleBrightness function, the monitor driver doesn't support brightness controls.

Brightness levels are represented as single-byte values in the range from zero to 100 where zero is off and 100 is the maximum brightness that a laptop computer supports. Every laptop computer must report a maximum brightness level of 100; however, a laptop computer isn't required to support a level of zero.

The only requirement for values from zero to 100 is that larger values must represent higher brightness levels. The increment between levels isn't required to be uniform, and a laptop computer can support any number of distinct values up to the maximum of 101 levels. You must decide how to map hardware levels to the range of brightness level values. However, a call to the display miniport driver's DxgkDdiGetPossibleBrightness function shouldn't report more brightness level values than the hardware supports.

To avoid problems that might occur if the system BIOS and the monitor driver both control display panel brightness, the display miniport driver should set bit 2 of the argument to the _DOS method. For more information about the _DOS method and its arguments, see the ACPI specification. By setting bit 2, the system BIOS is informed that it shouldn't perform any automatic brightness changes.

An integrated panel device should support the ACPI brightness control methods (_BCL, _BCM, and _BQC). _BCL and _BCM are unchanged since version 1.0b of the ACPI specification; you can find their definitions in the ACPI 3.0 specification in sections B.6.2 and B.6.3. _BQC is optional and is defined in the ACPI 3.0 specification in section B.6.4. For definitions of brightness levels, see Brightness Levels.

The system BIOS should support setting bit 2 of the argument to the _DOS method on the graphics adapter to allow automatic system BIOS brightness changes to be disabled. This bit is an addition to the previously defined values for the bits in this method. For details about this bit, see section B.4.1 in the ACPI 3.0 specification.

If this bit isn't supported, the monitor driver and the system BIOS can both change the brightness level, resulting in a flicker of brightness. In addition, the brightness might potentially be set to a value that isn't what the user requested.

ACPI_METHOD_DISPLAY_DOS, defined in Dispmprt.h, is the alias for the ACPI automatic brightness control method. This alias indicates that the system BIOS is capable of automatically switching the active display output or controlling the brightness of the LCD. Its parameter can be one of the following values.

For the ACPI_NOTIFY_INC_BRIGHTNESS_HOTKEY and ACPI_NOTIFY_DEC_BRIGHTNESS_HOTKEY notifications, the monitor driver's default behavior is to increment brightness by at least five percent more (or decrement brightness by at least five percent less) than the previous brightness level until the next available five percent step level is reached (5, 10, 15, ..., 95, 100). Incrementing or decrementing with shortcut keys can create asymmetrical patterns in brightness levels, as the following examples show.

So, I had to install a new Power Supply for my PC a couple days ago because my PC wouldn't start. After I had life again and thought all was good, I immediately noticed I was unable to connect to my wired internet.

I went to device manager and noticed my ethernet device wasn't even listed under network adapters but now under other devices as "ethernet controller". When I clicked on it, I was met with the following device status: -The drivers for this device are not installed. (Code 28) -There are no compatible drivers for this device. -To find a driver for this device, click Update Driver.

I tried troubleshooting multiple times through windows but when I followed their steps and restarted my PC, still nothing changed. Then, I went to Intel forums, videos, and websites supporting my issue and went through various guided steps to try and solve this.

After installing the latest version of Intel Ethernet Adapter Complete Driver Pack and many hoops and bounds later, I went back into device manager and noticed my ethernet device was now showing under network adapters as "Intel(R) Ethernet Controller (2) I225-V".

In device manager, I attempted to automatically install the driver through windows and it would not work being unable to find a compatible driver. I also tried manually installing it and choosing a driver and was still unsuccessful.

After enabling/disabling my ethernet device, trying the steps over and over again, trying to install an older version of the driver, updating my BIOS, made sure my ethernet cables were stable and good, and going down tons of rabbit holes, I end up where I started with the same device statuses.

2. I don't know what caused my last power supply unit to fail. I was able to power on and operate my PC the night before like any typical night, but the next day it wouldn't power on at all after trying a different power cord, outlet, etc.

When I go into device manager and attempt updating the driver with the file I extracted from the Intel Ethernet Adapter Complete Driver Pack zip file I downloaded, I am met with this screen (image applies to both searching automatically for drivers, and browsing my PC files for driver.

I also made the discovery that when I click on "Let me pick from a list of available drivers on my computer", and choose any of the listed Intel driver devices to try and install, I am met with the same (Code 10) this device cannot start. Additionally, now my device name of "ethernet controller" moves from the other devices tab to under the network adapter tab and matches the name of the driver device tried installing prior as you can see in this image:

So I went to your link and downloaded and extracted the zip file of "Intel Network Drivers" version 26.2.0.1 under the subcategory "LAN Drivers". I auto ran the app and attempted to install it was met with this screen:

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