Bug 457642 - screen rotation doesn't work using fbdev backend
Summary: screen rotation doesn't work using fbdev backend
Status: RESOLVED UNMAINTAINED
Alias: None
Product: kwin
Classification: Plasma
Component: platform-fbdev (other bugs)
Version First Reported In: 5.23.5
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2022-08-08 18:16 UTC by Denis
Modified: 2022-08-08 18:48 UTC (History)
1 user (show)

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Description Denis 2022-08-08 18:16:45 UTC 
SUMMARY
***
Hello, I'm using kwin-5.23.5-2 on aarch64 and an FB device is used for backend.

Tha problem is that I can't rotate the screen using kscreen-doctor like kscreen-doctor output.1.rotation.left.
Does fb support rotation?
***


STEPS TO REPRODUCE
1. kscreen-doctor output.1.rotation.left 

EXPECTED RESULT:
A screen is rotated.


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
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KDE Plasma Version: 
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Qt Version: 

ADDITIONAL INFORMATION
Comment 1 Nicolas Fella 2022-08-08 18:35:13 UTC 
More recent versions of KWin do not support fbdev at all since fbdev has been deprecated for a long time.

KWin only supports using DRM now, so I'd recommend you get that working with your device, possibly using SimpleDRM
Comment 2 Denis 2022-08-08 18:46:29 UTC 
(In reply to Nicolas Fella from comment #1)
> More recent versions of KWin do not support fbdev at all since fbdev has
> been deprecated for a long time.
> 
> KWin only supports using DRM now, so I'd recommend you get that working with
> your device, possibly using SimpleDRM

So looks like rotation wasn't implemented at all in fbdev, right? There is no updateTransform implementation for fbdev
Comment 3 Nicolas Fella 2022-08-08 18:48:02 UTC 
yes, it's probably just a case of "nobody implemented it"