Red Hat Bugzilla – Bug 1299330
UltraHD display appears as if resolution is reduced
Last modified: 2016-12-20 12:58:14 EST
Created attachment 1115754 [details]
picture of terminal under nouveau (bad)
Description of problem:
On my 3840x2160@30 display, driven by a GTX 650 via HDMI 1.x using Nouveau, characters are very hard to read in a terminal.
If I switch to the proprietary nvidia driver, all is well.
(See attached photos of a terminal window.)
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. display text in a terminal
2. try to read it.
Very hard to read
Easy to read.
I'm attaching two reconstructions of the Xorg.0.log (darn journald for making this hard): one for nouveau and one for proprietary nvidia drive.
I'm also attaching a photograph of a term when running nouveau and one when running the proprietary nvidia driver. Both photos appear to suffer from moire effects.
This problem has been around for a long time. At least since Fedora 22, but I'm sure longer than that.
I'm guessing that this is some kind of clocking problem because transitions from black to white or vice versa seem to be reduced.
On the other hand, it might be something else. For example, the monitor can only work with 4:2:2 chroma subsampling and if the driver isn't doing this, something bad will happen.
Created attachment 1115755 [details]
picture of terminal under proprietary nvidia (good)
Created attachment 1115756 [details]
log of nouveau driver
Created attachment 1115757 [details]
log of nvidia driver
This message is a reminder that Fedora 23 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 23. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as EOL if it remains open with a Fedora 'version'
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version'
to a later Fedora version.
Thank you for reporting this issue and we are sorry that we were not
able to fix it before Fedora 23 is end of life. If you would still like
to see this bug fixed and are able to reproduce it against a later version
of Fedora, you are encouraged change the 'version' to a later Fedora
version prior this bug is closed as described in the policy above.
Although we aim to fix as many bugs as possible during every release's
lifetime, sometimes those efforts are overtaken by events. Often a
more recent Fedora release includes newer upstream software that fixes
bugs or makes them obsolete.
Fedora 23 changed to end-of-life (EOL) status on 2016-12-20. Fedora 23 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.
If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen this bug against that version. If you
are unable to reopen this bug, please file a new report against the
current release. If you experience problems, please add a comment to this
Thank you for reporting this bug and we are sorry it could not be fixed.