Wikipedia:Reference desk/Archives/Computing/2017 May 8

= May 8 =

Keyboard Kindle
Can anyone please tell what was the resolution (i.e. ppi) of this appliance ? — Preceding unsigned comment added by 27.255.220.49 (talk) 02:32, 8 May 2017 (UTC)


 * According to Amazon_Kindle, 600×800, or 167 PPI. StuRat (talk) 02:37, 8 May 2017 (UTC)

ZFS compression setting
The ZFS article says it supports transparent compression. Can you selectively choose which folders to compress or does the compression setting have to apply to the whole drive?

I have a lot of movies on my harddrive so it wouldn't make sense to compress the whole drive and slow it down when only non-video files will benefit from the compression. ECS LIVA Z (talk) 05:56, 8 May 2017 (UTC)


 * It seems ZFS is smart enough to figure out that kind of issue transparently itself - this says "The biggest advantage to LZ4 is the early abort feature. If LZ4 does not achieve atleast 12.5% compression in the first part of the data, the block is written uncompressed to avoid wasting CPU cycles trying to compress data that is either already compressed or uncompressible." -- Finlay McWalter··–·Talk 12:14, 8 May 2017 (UTC)

Double touch phone screen display ‘on’
I require the ‘’.apk’’ file that allows you to display the screen (locked or unlocked) without having to press the ‘specifically made’ hard side button. Thanks in advance! Note: Apparantly, the display appears after double clicking or tapping the screen... 116.58.202.194 (talk) 06:20, 8 May 2017 (UTC)
 * There are a bunch of apps that claim to do this. But I'm not aware of any that legitimately offer APKs outside the app store.
 * I'd also be a bit dubious about these app's effect on battery life. ApLundell (talk) 14:53, 8 May 2017 (UTC)
 * LG smartphones (at least the G3) have this natively. I've not noticed any significant impact on battery life. Also your second link only appears to turn the screen off, not on. MChesterMC (talk) 09:48, 9 May 2017 (UTC)
 * Of course, when I said I was dubious about the effect on battery life, I did not mean phones originally designed to have this feature. ApLundell (talk) 13:45, 9 May 2017 (UTC)

Ubuntu package uninstallation
Hi. What's the correct way to uninstall packages in Ubuntu 16.04? I keep reading different ways to do it, but i'm also hearing that the synaptic package manager is the safest and correct way to do it. Then how do i find the name of what i need to remove with the synaptic package manager? Sometimes the names aren't clear. Thanks ツ Jenova   20  (email) 14:39, 8 May 2017 (UTC)
 * Synaptic (or any package manager) are essentially pretty user interfaces for apt-get commands. Your question is answered in command-line style at.
 * You need to know the name of the package you want to uninstall, though. You can try (in Synaptic) to search for the program name in the package description and see what comes up.
 * Whatever method you eventually use, you will need root access, and this can badly damage the computer (you can remove every package, including stuff you need to boot, this way). Using a package manager should be marginally safer than the command line, because you might glance at the package description before removing it, while there is not much difference between sudo apt-get remove random_stuff_you_want_removed and sudo apt-get remove important_package_that_you_should_not_remove; but it is also much more tedious - if/when something goes wrong, the command line usually gives useful warnings, which may not be the case in the package manager. Tigraan Click here to contact me 11:59, 10 May 2017 (UTC)


 * I saw that site but it was a bit technical for me. It left me with the opinion that command line/terminal carries a lot of risks. For this reason (and all the horror stories i read) i'll stick to the synaptic package manager and installed Ubuntu app store. Thanks for the info ツ Jenova   20  (email) 13:03, 10 May 2017 (UTC)

Task.apk
I require the latest version available for Sony brand smart phones, my one does not consist. If unavail, provide an opensource software that fit the need, e.g., without internet connection usage... 116.58.201.218 (talk) 18:24, 8 May 2017 (UTC)

Notes.apk
I require the latest version available for Sony brand smart phones, my one does not consist. If unavail, provide an opensource software that fit the need, e.g., without internet connection usage... 116.58.201.218 (talk) 18:24, 8 May 2017 (UTC)

Calender.apk
I require the latest version available for Sony brand smart phones, my one does not consist. If unavail, provide an opensource software that fit the need, e.g., without internet connection usage... 116.58.201.218 (talk) 18:24, 8 May 2017 (UTC)
 * These apps aren't legitimately available as loose APKs that you can just download off the web. You need to upgrade your phone through the normal upgrade process for that phone.
 * ApLundell (talk) 21:15, 8 May 2017 (UTC)