Hi Patrik, On Thu, Oct 20, 2016 at 12:39:35AM +0200, Patrik Jakobsson wrote: > Sorry for late reply. Could be that we're not restoring the state > properly. Not sure though that we guarantee that the framebuffer > contents is valid after unbind. Perhaps take a look at what other > drivers do. I see the same issue on my PSB systems which run SDVO so > it is at least not LVDS related. Unfortunately I wont have time to > look at anything gma500 related at the moment. Feel free to dig into > this and I'll also put it on my todo-list.
Thanks for taking the time to reproduce this issue. This rules out any local board layout issue on my side. For the record, my hardware is the Advantech SIMB-M02 Mini-ITX board. I should have mentioned that the issue persists after unbind. That is, when I run fb-test only after unbind, I see the same corrupted display. So framebuffer content invalidation on console unbind is unlikely to be the issue here. One more point that we see a similar issue with our Qt based application that uses the "linuxfb" plugin. The interesting twist here is that SOMETIMES the display corruption issue just disappears after a few minutes. The application is idle during that time. Not sure what to make of that. Thanks, baruch > On Mon, Oct 10, 2016 at 10:01 AM, Baruch Siach <baruch at tkos.co.il> wrote: > > I am using the gma500 driver of the latest stable kernel, 4.8.1. My > > hardware is Atom N2600 processor integrated graphics controller, PCI PID: > > 0x0be1. Output is LVDS. The system starts with framebuffer console > > enabled. Later in the boot process I unbind the console with the following > > command: > > > > echo 0 > /sys/class/vtconsole/vtcon1/bind > > > > Immediately as the console is unbound some colors on the screen appear > > distorted. The links below show the output of 'fb-test' > > (https://github.com/prpplague/fb-test-app) before and after unbind. > > > > http://filebin.ca/2xxwlwtBBzBN/display-good.jpg > > http://filebin.ca/2xxxTyIboJnR/display-bad.jpg > > > > Suggestions are welcome. -- http://baruch.siach.name/blog/ ~. .~ Tk Open Systems =}------------------------------------------------ooO--U--Ooo------------{= - baruch at tkos.co.il - tel: +972.52.368.4656, http://www.tkos.co.il -
