KDE 4.9.3 and disk wait

Good evening to all of you, Arch Linux friends...
I know I'm gonna ask you the classic one million dollar question but there's something I've not been able to fix yet, so I hope you can give me a hand. :-)
I've set up Arch on my laptop, choosing KDE as my default desktop environment.
After hours of daily usage, one of the applications working in foreground (Firefox, Dolphin or KMail), stops working and there's nothing I can do to make the whole system work again...
In System Activity, I notice, close to the Firefox process, for instance, the writing "disk wait" but it's impossible to kill the process even if I open up a shell prompt and use the "kill -9 process_id" command...
As for the issue itself, I used to think it was something related to my old laptop but now that I've bought a new one, my opinion is that there's something now working the right way in KDE.
Am I the only one facing this problem or is it more common than I think???
Burroughs.
Last edited by Burroughs (2012-11-30 17:25:30)

You need to install kdegraphics-thumbnailers, then enable PDF preview in dolphin configuration (General > Preview)
Last edited by jib2 (2012-11-16 22:30:20)

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* https://support.mozilla.com/en-US/kb/Firefox%20consumes%20a%20lot%20of%20CPU%20resources
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* https://support.mozilla.com/en-US/kb/High%20memory%20usage
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Right, so I'm pretty new to Mac, after getting my first Mac computer (a 17-inch MacBook Pro) at the end of January this year. It's been great so far and I love the thing, but I've suddenly encountered some crazy problems which I'm pulling my hair out over because I have tried everything to fix them, and have had no luck.
I'll try to include as many details as possible, and I'm prepared to bear with anyone who asks me about something I've alrady tried, just so I can get this sorted.
Okay, so first of all, the main problem seems to be with permissions, mostly with disk-write permissions. Any apps that I want to install that required keychain access will no longer install. I enter my keychain password, hit Return, and the dialog box closes without continuing. So I hit "Install" again and it becomes a never-ending cycle of entering my password to no avail. Now, this happens with ANY application that requires keychain access to install. It is not limited to any particular application. I know my password is right because the box closes, and if I enter it wrong, the dialog box shakes because it is incorrect.
Furthermore, it seems keychain access is problematic in other apps. If I want to authenticate something, it will do the same thing as I mentioned before, meaning I get nowhere with the application.
From here, it gets worse. If I download something (anything), then restart my computer, it is still there. As it should be. However, if I delete an APPLICATION (not just any file) OR change preferences for some programs (one in particular that I specifically don't want starting up on.... startup), including through System Preferences>Users & Groups>Login Items, they will not save. This is driving me insane. For instance, I downloaded some free apps from the Mac App Store to try out, but decided I didn't want them. I tried to deleted them from the app folder and succeeded. Emptied trash. Gone. Restart, and.... they're back? So I tried to uninstall them via the Mac App Store, once I found you could do that. Again, it didn't work. Any Login Items preference changes don't stay after a restart.
Originally, none of this was a problem and everything was working fine. The first sign that something was wrong would be Apple Mail often asking for passwords, usually for my Hotmail accounts, saying that they were rejected by the server (but are correct passwords, I get the emails from the accounts, and the passwords are always accepted once I type them in, only to be asked for them some time later on for no apparent reason). At the time, I tried to repair the keychain, tried deleting and recreating the mail account entries and what not, but nothing helped. It still happens, but at the time, it was more of a niggly thing than an outright problem.
I should also mention that I did use BootCamp to install Windows 8 on a small partition, but after I couldn't boot back into Mac (I didn't realise you had to use the Option key whilst booting), I found out that you had to hold the Option key to get back into Mac, then used BootCamp to get rid of Windows. Everything was fine so far. Until I decided to reinstall Windows 8 with BootCamp. This is where things started going wrong. I decided to install a bootloader to make it easier for me to boot between the two systems. I was tossing up between rEFIt and Chameleon, and decided that rEFIt would be the best for my needs. So I downloaded and installed it, which seemed to go fine. Until I restarted. Mac would endlessly load (the spinning grey dots with the Apple logo).
Now, I actually managed to fix this, but I should probably go into more detail. First of all, holding the option key and selecting my Mac partition would allow me back into Mac, and same with Windows 8. At this point, I decided to uninstall Windows 8 to try fix my problems, except now BootCamp was giving me errors. I believe it was something about being unable to unmount the disc, but it may have been a different error. I don't entirely remember. So then I decided to try getting rid of rEFIt. I followed the instructions on the official site but it didn't work. So then I tried deleting the files with root (sudo) access through terminal. Which also failed....
So to the Recovery partition. Booting into Disk Utilities, I repaired permissions, which worked fine, and repaired the disk. I believe I had run the disk repair a few times before to try to fix BootCamp when it stopped working. Anywaym it had worked before, but this time, it said that it was corrupted and could not be repaired. Something about needing to reinstall Mac OS X. With all my files on this computer and currently nothing to back it up with (eventually I will have something to do backups with, but it'll have to wait a few months), I'm not going to do that.
Finally, I managed to delete the rEFIt files through Terminal within the Recovery partition. I ran permission repair and disk repair again to clean anything up. Disk repair gave me the same error, but now I could get back into Mac without holding the option key on every **** boot.
Now more problems had presented themselves. I decided that the lock under Login Items was probably preventing me form successfully changing my startup items. Trying to unlock it did the same thing as I previously mentioned. Type in my password, keychain accepts it, then nothing happens. The keychain settings were already defaulted so that keychain would stay unlocked after authenticated, and all stuff like that. Using "Get Info" on anything has permissions locked and again, I cannot unlock to change them, although looking at a PDF file just now, whilst still locked, it would allow me to add or remove users, so maybe that's not completely accurate. I believe I tended to look at the system folders though, and my name wasn't under ownership, although I don't believe it was meant to be, but I was hoping that maybe that would fix the problem. I guess not.
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Actually you first post is so long that most people just glance at it and move on. To say the least you are very verbose.
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Hello LaThoS,
thanks for your reply .
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I am attaching my sample code.
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Attachments:
AVT_v5_NI.vi ‏75 KB
enum.ctl ‏4 KB

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My issue is complex, but I'll try my best to explain it as I can.
One has been resolved it seems, but I am including it so that the whole issue can be seen in context.
Friday, May 16, 2014
Last night, after rebooting my Mac Pro from my Bootcamp partition (I'm using Windows 7 Professional if that information is helpful) I received a kernel panic upon Mac OS X booting (Mac OS X 10.6.8).
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This morning I woke my Mac Pro from sleep, opened Disk Utility and tried verifying the hard drive to see if it was temporary — same result, 'please insert the Mac OS X install DVD and repair the drive.' — I also tried booting the install DVD again with no result.
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8GB of RAM (4 x 2GB)
500GB Western Digital Caviar Blue HDD (less than a year old, boot drive for Mac OS X 10.6.8)
1TB Samsung HDD (for data storage and also containing Bootcamp partition)
2TB HDD (cannot remember manufacturer, contains Time Machine backups, as well as data storage)
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Sorry for the long post but I really need to be able to boot from my optical drives.

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KDE 4.9.3 and disk wait

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