I have a Fedora 20 machine which is receiving UDP broadcast packets at
regular intervals on a strange high port. No program is presently
listening for these packets. If I run, "tcpdump -i eth0 port 29531", I
see each of the packets arriving just as I expect. Note, the packets are
not empty and contain mostly ASCII characters.
But if I then run, "nc -lu 29531", I don't see anything! Why not? What
obvious thing am I missing?
This same operation works better (but still not as I expect) on Fedora
14. NC shows one packet arriving but then doesn't show any more.
Running NC under strace on both machines, I see F14 NC seems to use
poll(2). It outputs one packet then hangs on poll. F20 NC seems to use
select(2). It hangs on the first call.
SELinux and the firewall are disabled on both machines.
I had in the past followed the instructions in
But I wanted to try to install fedora 20 and have a a simpler
partition layout. In the process I found out a bit on how the system
I first upgraded chrome os to get a new kernel (3.8.11) and copied the
kernel partition, /lib/modules and /lib/firmware.
I then got a f19 ssd image and booted from that.
The usb boot being enable flag is stored in the internal flash. The
flags listed in vboot_reference/firmware/lib/vboot_nvstorage.c are
storred in the first 16 bytes of the disk. To clear chromeos and keep
the machine booting from USB I did
$ dd if=/dev/zero of=/dev/mmcblk0
Create a nvram.txt file with
The 1 in the middle is the usb boot flag.
$ xxd -r -p nvram.txt nvram
$ dd if=nvram of=/dev/mmcblk0
I then created 2 partitions, one for the kernel and one for the root.
To get the kernel to boot, I checked
and noticed that what was needed was:
Correct type: sgdisk -t1:7f00 /dev/mmcblk0
Setting attribute bits 48 and 56: sgdisk -A1:set:48 /dev/mmcblk0;
sgdisk -A1:set:56 /dev/mmcblk0
Repack the kernel with vbutil_kernel and point it to the new root
partition. I then got the fedora20 root image, extracted the files for
/ and replaced /lib/modules and /lib/firmware.
I tried to get X running with both the armsoc and fbdev drivers, but
so far no success, which is fine for me since I use the machine as an
I am at the WiFi Alliance meeting and all the room projectors have
miracast as the perfered projecting method.
So I go looking for miracast and fedora via google and got a few hits,
mostly looking for support!
one project saying that Fedora 20 is 'too old'.
So is there any work for miracast support?
I don't know exactly when this happened, but today when I tried to use
K3B, I get the following error:
[paul@paul Desktop]$ k3b
k3b: error while loading shared libraries: libproj.so.0: cannot open
shared object file: No such file or directory
A search for libproj.so.0: reveals that it is on the system.
[paul@paul Desktop]$ whereis libproj.so.0
Any ideas how I can fix this? I have tried reinstalling K3B and the
Thanks in advance.
cheers, Paul - VA7NT - email: va7nt(a)telus.net
"Those who hear not the music, think the dancers mad."
"Tolerance becomes a crime when applied to evil." - Thomas Mann
"That state which separates its warriors from its scholars will have its
thinking done by cowards and fighting done by fools"
- Thucydides - The Pelopenisia
"The Malice of the wicked is reinforced by the weakness of the virtuous."
Many applications give unhelpful error messages,
but I've never met any quite as useless
as the invariable message from BackupPC:
"Unable to read 4 bytes"
If only it could sometimes say
"Unable to read 3 bytes"
or even "Hooray, was able to read 1 byte".
What 4 bytes did it want to read, incidentally?
e-mail: gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin 2, Ireland
Documentation tells me that kickstart allows an --append switch to the
bootloader command to add additional text to the GRUB2 boot line. I
haven't experimented with this and it is unclear to me if the change
goes only into /boot/grub2/grub.cfg or if it is also put into
/etc/default/grub. But adding things is not my objective.
I want to delete "rhgb" and "quiet" on the boot line, preferably in both
places. Is there any way to do that through kickstart or do I have to
use a post-install step?
According to FedEx, my new machine is on a truck speeding to my
local distribution center for delivery tomorrow. So hopefully it will
be here tomorrow. I had two questions:
1) It comes with Windoze 7 (with an upgrade option/disc for W8). Not
sure if I want to wipe it off (ideally, I would have liked to have not
paid for it) but I was wondering if I wanted to do a dual boot, is
there a set of instructions somewhere that I could follow? I have had no
problems with earlier windoze xp unProfessional dual installs, but not
with W7 or W8 (have not even seen a machine with this one). I do wonder
about keeping an OS I am likely to only use when I am talking to some
technical support for some service. Somehow the ones that require
contacting technical support always want you to use IE. I bluff my way
through on these ones.
2) This laptop has touchscreen abilities. While I could in general care
less about this feature, again I did not have an option to get rid of
it. So, I wonder if it is possible to use the touchscreen features with
Am I better off trying CentOS on this machine because of the two
questions above? I would however like to stick to Fedora.
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I'm trying to use SFLPhone as IAX softphone on my FC20 laptop and with
my Logitech Clearchat USB headset. The output is fine and perfect, but
the input is terrible (glitches, really can't hear anything. In the same
environment Skype is perfect... The only difference I can see in the
configs Skype using pulseaudi, but SFLPhone config looks like this:
Sound manager: PulseAudio
do you have any idea what should I change to make it work?