No output on display with Weston using fbdev backend

[Pekka Paalanen]

On Wed, 21 Mar 2018 14:40:13 +0530
nsolanki at codeaurora.org wrote:

> Hi Wayland Team,
> 
> 
> I am using weston 1.9.0-r0 version and compiled weston for fbdev 
> backend.
> 
> But I do not see any output on display. Basically I do not see call 
> reaching to "ioctl(fd, FBIOPUT_VSCREENINFO, &varinfo)" in function 
> fbdev_set_screen_info().
> 
> 
> So, if I add a call "ioctl(fd,  FBIOPUT_VSCREENINFO, &varinfo)" in 
> function fbdev_output_repaint_pixman(), I can see output on display.
> 
> Should I add FBIOPUT_VSCREENINFO ioctl in function 
> fbdev_output_repaint_pixman() ?
> Can you please help me regarding this?

Hi,

it is unlikely to find help with such an old Weston, even more so with
the fbdev backend which at least I would like to just delete already.

But the fbdev backend is still in Weston, so I'd recommend trying a
more recent version. You can also check git to see if there are code
changes in the fbdev-backend.

I don't think FBIOPUT_VSCREENINFO at every repaint is good in any case.

You might be interested in reviewing this patch or the whole series:
https://patchwork.freedesktop.org/patch/200333/

What I've occasionally tested the fbdev-backend, I've never needed a
call to FBIOPUT_VSCREENINFO, so your use case must be somehow
different. Explaining exactly how and in what kind of a system and
environment you are running Weston could help. E.g. is it a secondary
fbdev device, or using UDL driver.


Thanks,
pq
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