At boot . . . https://groups.google.com/forum/#!searchin/beagleboard/Robert|sort:date/beagleboard/Nb5TQxykUo4/9MIJYFQB43YJ
Note the * cmdline=video=* comment by Robert. However, as with anything Linux, it is *very important* that you do not put your hardware into a mode it can not handle. SO make sure you know what you're doing before you make this change. On Tue, Dec 2, 2014 at 8:17 PM, ivo welch <ivo...@gmail.com> wrote: > > 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.) > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
