dear BBB users---I searched for ubuntu 14.04 but did not find anything
related to this question. (it may be related to the uEnv.txt EDID question
I posted earlier, but maybe not.)
I have two BBB, one running ubuntu 13.10, the other running 14.04.1. the
13.10 distro produces a rock-solid text display on two different monitors.
the 14.04.1 is subtly flickering on both. I believe both boot into the
linux framebuffer, not a graphical environment (so no X and xrandr).
both are right now connected to an asus vs229 monitor. it is a 1920x1080
full HD monitor. the reason why I suspect this is a beaglebone issue is
that the same weird issue has also occurred on a DELL monitor. solid on
13.10, flicker on 14.04:
ubuntu 13.10 ubuntu-armhf: the asus monitor tells me it selects a mode
of 1680x1050 65KHz 60Hz. (solid)
ubuntu 14.04.1 LTS arm: the asus monitor tells me it selects a mode of
1280x1024 64KHz 60Hz. (flicker)
apparently, the command to control the linux framebuffer is fbset. by
itself, it tells me the current resolution. (there is no edid or
resolution info in /var/log/syslog as far as I can tell.) this is working.
changing the framebuffer resolution is another matter, though.
fbset -xres 1920 -yres 1080 tells me that this is an ioctl
FBIOPUT_VSCREENINFO: Invalid argument. choosing a smaller resolution, like
fbset -xres 640 -yres 480 leaves the current screen-res, but just displays
on the top, so it does not really change the resolution at run-time.
are there any ways to change the BBB resolution at run-time?
/iaw
PS: (interestingly, X is not included in the images, although the distro
only uses about 370MB of 2GB or eMMC. I am not complaining---thanks to
whoever packaged it, of course.)
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