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meefik / linuxdeploy

Install and run GNU/Linux on Android
https://meefik.github.io/linuxdeploy
GNU General Public License v3.0
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Flickering/Flashing Framebuffer #148

Open Stef1234 opened 10 years ago

Stef1234 commented 10 years ago

Hello I've installed Debian Wheezy to my Galaxy note 10.1 (2014 ed) and ran its gui environment via the Framebuffer method. All went smooth and after editing xorg.conf it could recognize all kinds of input.

Then I tried to do the same to a very similar device (notePro 12.2), I enabled Virtual Terminal on kernel config and predictably outputting to Framebuffer worked. Only this time my framebuffer is intermittently flashing. I tried to pause the Android stack it did not work (black screen), killed zygote and surfaceflinger services manually (after having edited init.rc from the ramdisk so that to disable the auto-restarting feature of the services), again tablet's freezing. Even tried to change resolution either through FBset or even xrandr, errors all over the place.

Last I tried was to enable the (virtual) second screen feature from "developers options". This time around I got a more rapid flashing which made the framebuffer image almost watchable (as if I am/was getting around 10-20 Hz of refresh rate). Also I get corruption all over the place from android elements, like a toast or even the pointer image.

In short nothing works as it should, and in an almost equivalent setup with equivalent kernel modification (I merely enabled "permissive" and "config_vt") it works perfectly. What gives?

Oh and here's a video showing exactly that. First slow flashing and then (after enabling the "secondary" screen) rapid flickering: https://www.youtube.com/watch?v=uUBW07HrSLo

And here's the logs from xorg and linuxdeploy as I ran the above video: http://www1.zippyshare.com/v/52020430/file.html

erhan- commented 9 years ago

The problem is that the android ui and the linux system both access the screen and update it.

When you start your system normally it goes to a blank screen. There it should not flicker. What I do for example with arch is that I start the system. Somehow X doesn't start with anything else than root. So at the moment for fiddling around I do sudo openvt -f -c 2 'startx' over ssh.This is not the solution but it works without flickering at the moment.

meefik commented 9 years ago

Try "Properties -> GUI settings -> Freeze Android UI -> Stop".

erhan- commented 9 years ago

That didn't work and Linux would't show up.