John's Blog

Why would anyone want to swap left and right pulseaudio channels? After some web searching I found that I am hardly alone. The classic problem is that your computer is on one side or the other, the audio-in cable goes to one speaker or the other, and the audio cable is too short. But this is linux, after all, so most things if not all things are possible, right? The first fix I came across was simple enough except sadly it didn't work. This called for editing /etc/pulse/deamon.conf and uncommenting the lines ; default-sample-channels = 2 ; default-channel-map = front-left,front-right to appear as default-sample-channels = 2 default-channel-map = front-right,front-left and then restarting pulseaudio with pulseaudio -k Seemed very clean and elegant except that it didn't work. :( The next answer from  here  and this worked great. The steps (reproduced here) are: cat /proc/asound/cards and use the name string for the device you wish to use (the one in squ...

As indicated now in the title of Redhat Bugzilla 969648 the problem is the "data=writeback" parameter in /etc/fstab. Fedup and Fedora 19 have a problem with this particular setting.  I have two fedora machines - a desktop and a laptop. During the last upgrade cycle, Fedora 17-->18, the desktop upgraded without any problem whatsoever. On the laptop, I had managed to shoot myself in the foot due to basically having some parts of my kernel boot commandline that were present in grub.cfg but not in /etc/default/grub. (These were the parts that blacklisted nouveau so that the nvidia binary driver could run). At the end of the fedup procedure I had run     grub2-mkconfig -o /boot/grub2/grub.cfg as instructed and this wiped out the parts of my command line that were needed to run the nvidia driver and due to that I had all sorts of problems figuring out the problem. Of course once the problem was diagnosed the fix was relatively easy. This time around, in going from 1...

Addendum: This has been "working" for a long time but ... often the printer would get "stuck". I noticed that in the CUPS interface the default paper size was set to A4. I changed that to US Letter and the reliability improved considerably. Most info I got from this Ubuntu Board - I don't have too much here that adds to that but anyways .... Get the Canon Print Driver from here:   http://software.canon-europe.com/products/0010757.asp Specify Linux, English, and choose the RPM version. This turns out to be a 32-bit driver which seems to work fine on my 64-bit system. What gets downloaded is                   MP640_rpm_driver_pack.tar So first we need to               tar xvf MP640_rpm_driver_pack.tar The tarball contains another tarball (weird but that's how they did it). So next need to               tar zxvf cnijfilter-mp640series-3.20-1-i386...