Incorrect information about display shown in unity-control-center

Bug #1755490 reported by Dariusz Gadomski on 2018-03-13
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
hwdata (Ubuntu)
Undecided
Unassigned
unity-settings-daemon (Ubuntu)
Undecided
Unassigned

Bug Description

After connecting a LG 49UB850T-DA TV the following information is displayed in the unity-control-center: Goldstar Company Ltd 72"

It's misleading since neither the company name nor the diagonal matches.

Related branches

Dariusz Gadomski (dgadomski) wrote :

Goldstar seems to be a former name of LG (before the Lucky-Goldstar merge).

I've made a pull request upstream to update it:
https://github.com/vcrhonek/hwdata/pull/1

Dariusz Gadomski (dgadomski) wrote :

Another thing is the diagonal length calculation. From my quick look this is done based on EDID data in unity-settings-daemon.

summary: - Incorrect information displayed in unity-control-center
+ Incorrect information about display shown in unity-control-center
Dariusz Gadomski (dgadomski) wrote :

After examining raw EDID data from 2 different LG TVs I can see that both of them set bytes 21 and 22 of the EDID data in a wrong way.
They both state that the display size is 160x90 cm which in turn corresponds to a approximately 72" diagonal.

So unity-settings-daemon does its job correctly and EDID from LG is buggy. Trying to find more info about it.

Changed in unity-settings-daemon (Ubuntu):
status: New → Invalid
Changed in unity-settings-daemon (Ubuntu):
status: Invalid → In Progress
Changed in hwdata (Ubuntu):
status: New → In Progress
Victor Kareh (vkareh) wrote :

In case it helps, I've seen comments regarding some TVs encoding the aspect ratio (16/9 or 16/10) as though it was the size:

https://github.com/linuxmint/slick-greeter/blob/master/files/usr/bin/slick-greeter-check-hidpi#L24-L29

Not sure what is the actual source of this information, though.

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