Can I use framebuffer?

[debianroot20200524]

My phone:XiaoMi MI-ONE C1(Android 4.1.2)
GPU:Adreno 220
CPU:Snapdragon MSM8660
RAM：1GB
I want to install Debian wheezy armhf
Who can tell me?
Thanks a lot!

[ghost]

Please check this issue
#45

or Enter this command from Terminal Emulator
cat /dev/urandom > /dev/graphics/fb0
If you view "No space left on device", Your phone is not support Framebuffer.

[fervi]

@mionec1 @Cloud9350
Test Cloud is partially incorrect. Please check all exits fb, because it does not have to be a fb0, and the ejection of error does not necessarily mean lack framebuffer.

The procedure looks through the terminal (as root) go to the / dev / graphics and display themselves all the way out fb
ls fb*

Later, using the command
cat /dev/urandom> /dev/fbX

Under the X-type in the number. If you type something will change, ie. There are any dots, artifacts then you probably have access to the framebuffer.

[ghost]

@fervi This command from https://github.com/meefik/linuxdeploy/wiki/Framebuffer-notes
and I have fb0, fb1, fb2, hdmi but i am not working framebuffer 😄

[fervi]

@Cloud9350

Well, I have since fb0 to fb17 on fb0 I framebuffer, but after entering the command also shows me the error "No space left on device", but displays a different image artifacts. How displays various artifacts, framebuffer will work.

[ghost]

@fervi OK. I will retry testing.

[ghost]

@fervi No "No space left on device" message and the screen is slightly shaky. What is it?

[fervi]

@Cloud9350
Probably. "/dev/urandom" test is not a test which the official. Simply send information to the screen (if you can call it that). If you see something abnormal is a good chance (if not 100%), the framebuffer is working.
Set then Linux Deploy the configuration of the video device, I recommend even set "Freeze Android UI".
Also, remember to double check your "X to include" (best read logs or send) for several days configure X for Arch Linux.

TL;DR - Try it

[ghost]

@fervi Thanks. Thanks. Very Thanks. 👍
You make Bluescreen Burn in my phone. (Enable Freeze Android UI) 💯
It takes 5 hours to recover. 😄 <-- It's real. Why did I thought.

I Android UI Freeze turn off, i can view black screen.
Doesn't work.

[fervi]

@Cloud9350
Strange , but as usual you give "pause" does it work ?
If you have black screen it can work, but you don't have XServer or Xterm installed. (hypothesis). You should open /var/log/X* and check where is your problem

[ghost]

@fervi OK. I will retry.

[ghost]

@fervi
Install XServer & XTerm ✅
Android System UI Pause set ✅
I can see SOFT BRICK MY PHONE

"rebooting..."

And Remount, i can see..

xorg logging.

Wow.
I searching in Google.

== Edit ==
No ubuntu-drivers command, Only Invalid errors.
I Delete XTerm, and installing LightDM Desk Environment.

[plops]

We managed to make stuff appear on a screen of a Oneplus One with LineageOS.

Turns out that after every write to the memory mapped area, you have to submit the image for display using ioctl(fbfd, FBIOPUT_VSCREENINFO, &vinfo).

See here for a working code listing with more details:
https://github.com/plops/bacon_fb_test

I compiled it in a chroot debian environment. Make sure to stop surfaceflinger and zygote before running. Otherwise the phone will reboot.

It would be nice if someone could make the appropriate changes in the Xorg fbdev server, so that running Linux on Snapdragon based phones is finally possible again.