I have an AMD Radeon RX 460 Graphics (AMD POLARIS11 / DRM 3.23.0 / 4.15.0-72-generic, LLVM 5.0.1) which is connected to two 4k dell monitors with the latest amdgpu driver. When I wake the computer up from suspend, my display setting is often lost and one of my monitors render in half like below.
If I log out and log back in, 80% of the time this is fixed but not always.
Here is what the setting looks like
What could be the cause of this?
How can I fix this?
I have a Dell M3800 and recently purchased a Dell S2715H and connected it to the laptop through the HDMI cable. For whatever reason, the monitor is not detected by ubuntu.
My older dell monitor works with no issue on the same HDMI port (through a DVI to HDMI converter). The new monitor does not have a driver for linux but I assumed a driver is not needed.
Not even sure how to debug this. What could be possibly wrong here?
I have a MacBookPro8,2 (15-inch, Early 2011) and have installed Ubuntu using wubi on the windows partition. I could never get the b43 wifi chip to work reliably and I ended up buying a belkin usb wifi F9L1001v1 which has a realtek chip with r8712u module. Life is way better but still connecting to wifi hotspot is so random and fail many times. It works at home.
I have no idea why and do not have the skills to debug it. ro
1> Why the dongle work at home by have trouble connecting to some hotspots?
2> Has anybody been able to get the b43 work RELIABLY on this mac? Here is the lspci output
03:00.0 Network controller [0280]: Broadcom Corporation BCM4331 802.11a/b/g/n [14e4:4331] (rev 02)
Subsystem: Apple Inc. AirPort Extreme [106b:00d6]
Flags: fast devsel, IRQ 17
Memory at b0600000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Capabilities: [58] Vendor Specific Information: Len=78 <?>
Capabilities: [48] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [d0] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [13c] Virtual Channel
Capabilities: [160] Device Serial Number 27-b8-8f-ff-ff-08-e4-ce
Capabilities: [16c] Power Budgeting <?>
Kernel modules: bcma
Here is the kernel info
Linux ubuntu 3.8.0-44-generic #66~precise1-Ubuntu SMP Tue Jul 15 04:01:04 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
This is the instruction that I have followed.
http://wireless.kernel.org/en/users/Drivers/b43
3> I want to get a new laptop/mac but I hate the fact that I also need a dongle to use my Mac and with this horrible wifi experience makes me wonder if I should ignore apple if I want to use ubuntu only?
If you need to run your databases in lxc, what happen to your data files? Do you have access to the data file on the host os? I guess the processes show up in the gust os process but who about the the files given that lxc has its own file system?
Any other consideration to run your db inside lxc?
Is there any practical limit on the number of concurrent LXC containers to run on one box.
Obviously, this depend on the node spec (cpu, ram,..) but really what I am wondering is the cost of running a process directly on the os vs running the same process in dedicated container on the same box? If you have to put a number on the overheard difference, what is that over head? Is this a good way to figure out the maximum number of lxc container you should run on one server?
My question is around the security of an LXC container.
If I am running multiple containers on my box, and give users a separate ssh access to their owned container, can any of those container hack into the other containers on that box or the even the host machine?
Where are lxc containers security borderlines?
If I am given a bare minimum ubuntu machine in a private cloud environment with almost nothing installed on it(not even apt-get and ubuntu repositories configured) and the only user is root, what are the set of commands to run to turn this machine as configured as an ec2 standard ubuntu 12.04 image? One can find these commands here and there but I am looking for something that induces all I need to run to have a properly configuration machine as good as the amazon ubuntu ami.
I am following the instruction in http://jujucharms.com/~juju-gui/precise/juju-gui but I am getting the following error. It looks like a string is exepect where a boolean is defined.
$> juju deploy cs:~juju-gui/precise/juju-gui
Invalid options specification: options.staging.type: expected 'string', got 'boolean' 2013-02-11 19:31:37,896 ERROR Invalid options specification: options.staging.type: expected 'string', got 'boolean'
how do I fix this?
This is happening on Ubuntu Release 12.04 (precise) 64-bit Kernel Linux 3.2.0-25-virtual
I'm trying to increase the number of open files allowed for a user. This is for my eclipse java application where the current limit of 1024 is not enough.
According to the posts I've found so far, I should be able to put lines into
/etc/security/limits.conf like this:
soft nofile 4096
hard nofile 4096
to increase the number of open files allowed for all users.
But that's not working for me and I think the problem is not related to that file.
For all users, the default limit is 1024, regardless of what is in /etc/security/limits.conf (I rebooted after changing that file)
$ ulimit -n
1024
Now, despite the entries in /etc/security/limits.conf I can't increase that:
$ ulimit -n 2048
-bash: ulimit: open files: cannot modify limit: Operation not permitted The weird part is that I can change the limit downwards, but can't change it upwards - even to go back to a number which is below the original limit:
$ ulimit -n 800
$ ulimit -n
800
$ ulimit -n 900
-bash: ulimit: open files: cannot modify limit: Operation not permitted
As root, I can change that limit to whatever I want, up or down. It doesn't even seem to care about the supposedly system-wide limit in /proc/sys/fs/file-max
# cat /proc/sys/fs/file-max
188897
# ulimit -n 188898
# ulimit -n
188898
But even I get eclipse to run as root, my application still crashes because of "Too Many Open File" exception!
So far, I haven't found any way to increase the open files limit for a non-root user.
How should I properly do this? I have looked at several other posts but no luck!