[GTALUG] [GTALUG-Announce] Meeting Tomorrow

[hi--- via talk]

https://gtalug.org/meeting/2021-08/

The Linux 3D graphics stack with Alyssa Rosenzweig

GPUs and spinning cubes - what could go wrong? In this talk, we'll learn how 3D 
graphics works on Linux, from an OpenGL or Vulkan application down to the 
hardware, detouring through the dizzying world of shader compilers.

Lightning talks

This is GTALUG's version of an un-conference, a loosely structured short talks 
emphasizing the informal exchange of information and ideas between 
participants, rather than following a conventionally structured GTALUG 
meetings.  If you already have a topic in mind please send an email to 
speak...@gtalug.org to be added to the list of scheduled talks.

Location

We're going to use Zoom for this meeting

Time: Mar 9, 2021 07:30 PM Eastern Time (US and Canada)

Join Zoom Meeting: 
https://us02web.zoom.us/j/82282849562?pwd=SVhTbFpSZnNldEdQNllkM2w2YzNoQT09

Meeting ID: 822 8284 9562
Passcode: 338328

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Schedule

* 7:30 pm - Meeting and presentation.

Code of Conduct

We want a productive happy community that can welcome new ideas, improve every
process every year, and foster collaboration between individuals with differing
needs, interests and skills.

We gain strength from diversity, and actively seek participation from those who
enhance it. This code of conduct exists to ensure that diverse groups
collaborate to mutual advantage and enjoyment. We will challenge prejudice that
could jeopardise the participation of any person in the community.

The Code of Conduct governs how we behave in public or in private whenever the
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We invite anybody to participate. Our community is open.

Please read more about the GTALUG Code of Conduct here:
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Conduct please contact the GTALUG Board @ bo...@gtalug.org
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Re: [GTALUG] war story: horrible colours on Seiki TV under Fedora 34

[Stewart C. Russell via talk]

On 2021-08-09 8:52 a.m., D. Hugh Redelmeier via talk wrote:
> 
> I don't have the tools or the time to calibrate my monitor.

I'd be happy to lend you my ColorHug. Takes about 15 minutes. You will
be amazed at how less blue everything looks, because vendors always set
monitors for maximum brightness and coolness to wow people on the shop
floor.

cheers,
 Stewart

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[GTALUG] war story: horrible colours on Seiki TV under Fedora 34

[D. Hugh Redelmeier via talk]

I updated to Fedora 34 on my desktop a month or two ago.
Afterwards, everything on the screen had a horrible yellow cast.

I couldn't get much help because I use the nvidia video drivers.
Nouveau always goes sideways when I try it on this system, even though 
the card is old enough to be well supported -- GeForce 650.

I fiddled about everywhere, half-heartedly, and just lived with it.

- perhaps the in-place upgrade from F33 to F34 was botched.  I
  installed F34 from scratch and had the same problem.  So: no.

- perhaps new Nvidia driver had a bug

- perhaps chroma subsampling was botched (monitor supportss 4:2:2 at
  UltraHD resolution)

- ???

Clue 1: when I moved the HDMI cable from the Seiki to a Dell, without 
taking the machine down, the Dell display looked yellow too.

Clue 2: if I rebooted while connected to the Dell, the display looked 
fine.

I did not try movine the HDMI cable to the Seiki after booting with the 
Dell.  The Dell is a higher-bandwidth monitor and it's settings would not 
work with the Seiki.

In the end, I discovered that the mysterious colour management system
has a bad colour profile for my monitor.  (It turns out that before
F34 there was no colour profile for my monitor.)

Under settings: Color, I selected the monitor and clicked
right-pointing caret.  Could see a profile called SE39UY04, which
should be right for my Seiki SE39UY04.  But it isn't.

Added a profile, picking semi-randomly the Dell 2405FPW.  It worked a
lot better.

I don't have the tools or the time to calibrate my monitor.

The SE39UY04 was created by HP on 2018 Dec 20.  I wonder why -- they
have nothing to do with Seiki.

This seems to be managed by colord, the color daemon.  It seems poorly
documented, at least in man pages.

Profiles seem to live in two sqlite databases in /var/lib/colord.
The following test shows both databases have entries for this monitor.
grep -i SE39UY04 /var/lib/colord/*.db
The same command on an old F33 installation shows no hits.

So my problem boils down to the color management system learning about
my monitor, but getting it all wrong.

See 
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