Home / user-2919

Uli's questions

Martin Hope
Uli
Asked: 2013-05-05 02:29:01 +0800 CST
  • 23

There appear to be various different technologies available to use an SSD to act as a cache for HHDs. The ones I know of:

  • dm-cache (by Redhat - in the 3.9 Kernel, so it should be in ubuntu 13.10)
  • Flashcache (developed and used by facebook)
  • Bcache (developed and used by Google )
  • EnhanceIO (by STEC; based on Flashcache)

Are there any noteworthy differences in the various implementations? Which one is best for regular desktop PC use - to increase performance of usual programs such as web browsers or games?

ssd
Martin Hope
Uli
Asked: 2011-12-31 06:48:50 +0800 CST
  • 0

I recently installed Ubuntu 11.10 on a friends old Laptop (ASUS PRO60V). Everything is running great except I cant get any audio output from the output jack.

Audio works fine through the internal speakers, but once I plug in speakers or headphones into the jack (combined SPDIF & Analog) the internal speakers are muted but there is no output on the external speakers. My guess is it is trying to output through SPDIF instead of analog...

I tried different outputs settings in the sound setting menu and also looked at alsa mixer, but couldn't get it to work.

Any help would be much apreciated!

Kernel:

3.0.0-14-generic

ASound:

Advanced Linux Sound Architecture Driver Version 1.0.24.

Codec:

==> /proc/asound/card0/codec#0 <==
Codec: Realtek ALC880

==> /proc/asound/card0/codec#1 <==
Codec: Conexant ID 2bfa

Alsa Info here

sound
Martin Hope
Uli
Asked: 2011-08-01 03:01:21 +0800 CST
  • 9

I just bought a Lenovo x121e (E-350 version). I was able to successfully install ubuntu 11.04 and everything is running fine (for the system to boot an efi partition seems to be necessary however). The laptop has a Seagate Disk with a physical sector size of 4096 bytes.

After ubuntu is installed Disk Utility reports that my partitions are not properly aligned: screenshot

I have tried both fully automatic install wiping the disk (as shown on the screenshot) and setting the partions manually during install. Both variants show misaligned partitions.

  • Is this this a bug when creating the partitions or is Disk utility giving wrong information?
  • If the alignment is wrong and negatively affecting performance, how can I correct it (either now or with a fresh install)?
disk-utility
Martin Hope
Uli
Asked: 2011-05-02 07:48:33 +0800 CST
  • 14

I would like to stick to GRUB since it seems to be more actively developed and the entries are automatically updated after a kernel update. However I love the look of the Burg themes (especially sora_clean).

Are there themes available for GRUB2 which have a similar look? I especially would like a "folded view", showing only one entry per OS (by default), and a the installed OSes being shown as symbols, instead of listed text.

I would also be grateful for installation instructions along with the theme suggestions.

grub2
Martin Hope
Uli
Asked: 2011-01-17 04:29:54 +0800 CST
  • 12

I have hundreds of passwords, since I use a different random one for each website/service. They are all generated & stored with KeePassX, which can be synced to different computers and my android phone via dropbox (or ubuntuone).

I know the database of KeePassX is secure (at least with a good passphrase). But what about when I am copying the password into the clipboard (where it is stored for 5 seconds)? Can any program running in user-space access the clipboard and store the password? If so, how big of a security risk is this?

password
Martin Hope
Uli
Asked: 2010-12-27 04:07:59 +0800 CST
  • 13

I just bought a new SSD (OCZ Vertex 2) and plan to do a clean install of Maverick on it (/home is on a separate HDD). I read that it is wise to align SSD partitions.

What advantages does it truly bring to have an aligned partition on a SSD?

And how do I create an aligned Ext4 partition for the new SSD during the installation of Ubuntu 10.10?

10.10 ssd partitioning