users March 2021

users@lists.stg.fedoraproject.org

84 participants
96 discussions

What sets QT_IM_MODULE in F33?
by Robert G. (Doc) Savage 08 Apr '21

08 Apr '21

Using Fedora 33 with MATE desktop... I'm working with the developer of a very handy RPN calculator app called rpCalc to figure out why it doesn't work for my regular user 'doc' but works perfectly for a newly created user 'test'. The developer strongly suspects a Qt5 setting. We have narrowed our search to my local environment: $ env | grep QT QT_IM_MODULE=xim QT_AUTO_SCREEN_SCALE_FACTOR=0 QT_SCALE_FACTOR=2 The developer believes the first (set to =xim) is causing rpCalc not to function at all, and that the next two cause the font sizes on the calculator buttons to be oversize. I'm looking for one or more config files -- probably in my home directory -- that set these variables. Talk about looking for a needle in a haystack. Is there a cat | grep command (or equiv) that can recursively look for "QT" in all files in my home directory -- including hidden files? It would have to be able to output the full path to any files in which "QT" is found. Unfortunately cat does not support recursive searches. --Doc Savage Fairview Heights, IL

5 7

Identifying what is accessing a USB device.
by Patrick O'Callaghan 06 Apr '21

06 Apr '21

I have an external USB-3 2-disk docking station, and a script which can power up and down the drives as needed. I have a systemd automount unit that correctly powers up the dock when accessed, then mounts the drives (thanks Ed). After an idle time, automount unmounts the drives. A script detects when this happens and powers them down ... *at which point they immediately power up again, and remain up until I intervene manually, even though they are unmounted*. This never happens if I run the script directly from the command line (i.e. the drives power down and stay down). Clearly the docking unit isn't just doing this flakily on its own. Something is making it happen, and I've no idea how to discover what it is except that it seems to be correlated with systemd in some way. All of the above is 100% reproducible. I'm open to suggestions if anyone has any ideas. poc

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mdadm -> BTRFS conversion
by Patrick O'Callaghan 02 Apr '21

02 Apr '21

I currently have a pair of external drives configured as ext4 with RAID1 using mdadm, and mainly used for backup. My / and /home filesystems are now BTRFS so I'm looking at converting the external drives to BTRFS with RAID1. My main reason is to take advantage of BTRFS checksumming as a guard against bitrot, but I'd also like the flexibility of setting up subvolumes with different properties (the disks are currently 90% empty). Any thoughts on this? What would be the simplest conversion strategy if I go ahead? poc

4 10

Suggestion to improve documentation of Changes/BtrfsTransparentCompression
by misterx42＠protonmail.com 31 Mar '21

31 Mar '21

Just a small thing, but as someone who never actually played around with filesystems so far, I was looking to try out the changes outlined in Changes/BtrfsTransparentCompression, but the command on the page: btrfs filesystem defrag -czstd -r doesnt work without an additional argument. This is pretty obvious for people who already worked with filesystems before, but I think it would be a good idea to add a small, one sentence explanation of how to add the required path to the end of the command (ie / in my case). It would help people like me from getting confused and hopefully bring in more casual tinkerers trying the new change out. Thanks.

4 6

Compose Key
by David 31 Mar '21

31 Mar '21

Thank you Mr. Matthew Miller, I have never heard of a "Compose Key." https://en.wikipedia.org/wiki/Compose_key I try to learn this computering stuff, but I feel like a dog chasing my tail. In Gnome 40, the setting is easily found in the Keyboard settings menu under Settings. I have been needing this for years. It might maybe be possible that I once knew it, but the idea became forgotten to me. David Locklear

6 12

software trivia
by David 30 Mar '21

30 Mar '21

Somewhere deeply hidden in the author credits to a program that ships with Fedora is the phrase: "Help poor children in Uganda !" Can you guess that program ? I guess that is an easy question for all you serious / hard-core Fedorans. Nothing against Uganda, but I doubt anybody reading that is going to help poor children anywhere, much less another country. Hint: Version: 8.2.2637-1.fc34 David Locklear Ref: https://en.wikipedia.org/wiki/Bram_Moolenaar

2 1

BTRFS settings for media storage
by Richard Shaw 30 Mar '21

30 Mar '21

I've been running MythTV for about 10 years now and I've finally outgrown my media storage, currently a single 4TB disk drive. I have purchased 3 additional drives of the same model and plan to put them into a BTRFS RAID1 array. Setting nodatacow on the media directories is a no-brainer, but what other optimizations can I do? Thanks, Richard

5 13

How to debug grub2-efi -> kernel transition issues?
by Richard W.M. Jones 30 Mar '21

30 Mar '21

I have a weird problem on an old Asus Zenbook UX305C where new kernels cannot be installed by grub. Specifically what happens is they appear in the boot menu fine, but if you try to boot them then the machine hangs hard with a completely black screen. Oddly the kernel installed by Anaconda can boot, but obviously this makes upgrading the kernel RPM impossible. My real question is how on earth do I start debugging this? I edited the kernel command line, removed “rhgb quiet”, added “loglevel=9 nomodeset” but still no output at all is visible before the hang. The machine doesn't have a serial port. Any ideas? Does grub have debugging that can be enabled somehow? Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into KVM guests. http://libguestfs.org/virt-v2v

2 2

sort of Gnome40 related
by David 29 Mar '21

29 Mar '21

Here is a screenshot of my Gnome40 set-up. https://www.dropbox.com/s/2o40vvqgfs6vauk/Gnome40_Rawhide.png?dl=0 I really like the idea of hitting the SuperKey twice to get to this view of the desktop Just curious why anyone would use Gnome Tweaks in Gnome 40 ? I like Gnome40 better than Mate for several reasons. I like the idea of using the latest wayland / xwayland / mutter instead of X, however, I hope to learn other wayland compositors. I am using a Kensington trackball that does not have a scroll function. However, I guess there are ways to program the 4 buttons to do shortcuts. David Locklear

2 1

Can't mount XFS filesystems on Fedora 33
by Shawn Badger 29 Mar '21

29 Mar '21

I have a 10TB drive that is formatted with XFS and it has been working fine for a number of years and 2 days ago I did an update and now I cannot mount it any longer. I get "unknown filesystem type 'xfs'." from mount all of a sudden after updates. xfs_repair can see the volume and shows it with no errors and all the xfs related apps still are on the system. It seems as though mount lost XFS as supported filesystem. Has anyone else seen this or know where to point me to get the issue resolved? Thanks

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