disable gpu

[nernan]

i have a rpi3b+ im gonna be frank i have a usb monitor and i would like to disable onboard gpu so it can run, i checked it had its own separate gpu inside, its crazy! anyway thats all i need it disabled plz help

[HawaiianPi]

The Pi SoC boots from the GPU. It's basically a GPU with an ARM processor tacked on. So I doubt it's possible to disable the GPU. And the Pi is USB 2.0 only, with all USB ports and Ethernet shared by a single USB 2.0 interface on the SoC, so I wouldn't expect much performance from a USB monitor.

[W. H. Heydt]

In addition...GPU (VC4) blocks not being used get powered down automatically, so if you're not using them, they aren't drawing power anyway.

[hippy]

i have a usb monitor and i would like to disable onboard gpu so it can run

A USB monitor, presumably DisplayLink, can run while the Pi's GPU is also running, so it might be best to actually describe what problem you are having or what issue you want to solve.

If it's that the desktop is appearing on the Pi's GPU monitor as well as the USB monitor; that can be adjusted using X11 configuration settings.

Or do you mean disable the GPU in the USB monitor ?

[thagrol]

Doesn't display link us the primary GPU for the heavy lifting and only send the bits that have changed over USB? (https://en.wikipedia.org/wiki/DisplayLink#Technology)

In which case, disabling the GPU would stop the displaylink screen from working too.

[Gavinmc42]

OP's 1st post?
"Needs" to turn off GPU?
Frankly crazy?
But hey, noobies are allowed a few dumb questions

HDMI is not Displaylink, the Pi's don't do Displaylink.
Pi's are USB2.0 only, will it do Displaylink?
How fast would it go?
Open source DL Linux driver, does it work on Pi's?

Why not have HDMI and USB DL display, dual screen Pi's

[thagrol]

HDMI is not Displaylink, the Pi's don't do Displaylink.

Nobody said it was and nothing I can think of does displaylink natively

Pi's are USB2.0 only, will it do Displaylink?

Yes, displaylink works over USB2. Given the first devices went on sale in 2006 (source: https://en.wikipedia.org/wiki/DisplayLi ... ny_history) it pre-dates USB3

How fast would it go?

Not as fast as I'd like.

Open source DL Linux driver, does it work on Pi's?

Someone posted a guide on the forum recently so I'd say yes. Don't know which driver they were using though.

[hippy]

Pi's are USB2.0 only, will it do Displaylink?

Yes - https://www.raspberrypi.org/forums/view ... 0#p1437502

How fast would it go?

No idea. It's fast enough for me.

Open source DL Linux driver, does it work on Pi's?

No idea. I just use whatever driver support is included with the Raspbain Stretch kernel.

Why not have HDMI and USB DL display, dual screen Pi's

Indeed; why not ? It's what I'm doing as well as others.

Someone posted a guide on the forum recently so I'd say yes. Don't know which driver they were using though.

Probably this -

https://www.raspberrypi.org/forums/view ... 3&t=234586
http://multi-seat.com/raspbian-dual-monitors

[Gavinmc42]

Cool, next dumb question.
Is there client software for Raspbian(or any other OS) that turns a Zero +HDMI/DVI/DSI/DPI/LCD screen into a USB Displaylink client display?
5 screens on a Pi3B+ if using wireless keyboard mouse

Wonder if there is Free Pascal source for client?

[hippy]

Cool, next dumb question.
Is there client software for Raspbian(or any other OS) that turns a Zero +HDMI/DVI/DSI/DPI/LCD screen into a USB Displaylink client display?

Funnily enough I asked the same question a year ago -

https://www.raspberrypi.org/forums/view ... p?t=202518

As I noted: "Receiving is even easier than sending; just get a packet, decode it, put it to the right place in the frame buffer". Of course there's more to it than that but I can't see that it couldn't be done.

And some people seem to have done it, at least as proof of concept, including -

https://www.spinics.net/lists/linux-usb/msg133383.html

"We have ffs daemon and ConfigFS config to setup and act like a display link with 640x480 monitor. So on a host side we see another monitor and on the device side we have an window in which we can see image from host".

But I couldn't find any g_displaylink gadget or anything else showing how to do it, but I didn't search very far.

Wonder if there is Free Pascal source for client?

I don't know, but as there seems to be nothing for anything I'd be surprised if it only existed in a Free Pascal form.

If there is and it works with Raspbian, or particularly Ultibo, it would be extremely useful to have, an easy and cheap way to turn any HDMI or composite TV, any Pi supported LCD, into a USB DisplayLink monitor.