Bug#992617: xserver-xorg-video-radeon: Screen rotate doesn't work

Michel Dänzer michel at daenzer.net
Sat Aug 21 10:17:02 UTC 2021

On 2021-08-21 11:01 a.m., Kari Pahula wrote:
> Package: xserver-xorg-video-radeon
> Version: 1:19.1.0-2
> Severity: normal
> $ xrandr --output DVI-0 --rotate left
> xrandr: output DVI-0 cannot use rotation "left" reflection "none"
> $ xrandr -o left
> X Error of failed request:  BadMatch (invalid parameter attributes)
>   Major opcode of failed request:  140 (RANDR)
>   Minor opcode of failed request:  2 (RRSetScreenConfig)
>   Serial number of failed request:  14
>   Current serial number in output stream:  14


> [ 33984.302] (II) RADEON(0): GPU accel disabled or not working, using shadowfb for KMS

This is why. Rotation requires working HW acceleration.

> DRM Information from dmesg:
> ---------------------------

Since there are no DRM driver related messages in dmesg, looks like something is preventing the radeon kernel driver from loading at all. If you're passing nomodeset on the kernel command line, remove that. Otherwise, full dmesg output would be needed to diagnose.

Earthling Michel Dänzer               |               https://redhat.com
Libre software enthusiast             |             Mesa and X developer

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