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How can I check if KMS is enabled in my kernel? I've compiled mine with KMS radeon modeset defaulting to 1, but I still suspect that it is not enabled.

EDIT:

aatiis@aiur ~ $ dmesg | grep drm
[drm] Initialized drm 1.1.0 20060810
[drm] Initialized radeon 1.33.0 20080528 for 0000:01:05.0 on minor 0
[drm] Setting GART location based on new memory map
[drm] Loading RS780 CP Microcode
[drm] Resetting GPU
[drm] writeback test succeeded in 1 usecs

EDIT 2:

aatiis@aiur ~ $ glxinfo | grep render  
IRQ's not enabled, falling back to busy waits: 2 0
direct rendering: Yes
OpenGL renderer string: Mesa DRI R600 (RS780 9612) 20090101  TCL

aatiis@aiur ~ $ sudo grep -i kms /var/log/Xorg.0.log
[    57.201] (II) [KMS] drm report modesetting isn't supported.
Gilles 'SO- stop being evil'
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Attila O.
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2 Answers2

2

Kernel modesetting for radeon driver is supported after kernel version 2.6.31. If you have the driver with the version of later, you will be able to see a line that says "radeon kernel modesetting enabled." in dmesg log. Please check if dmesg contains any string with "modesetting."

Sangman Kim
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An easy test is this. Start an X session, then switch to a virtual terminal. If there's a slight delay, like the screen darkening for a second or so, KMS is NOT enabled. If it's near instant, it's almost certainly working.

Super_ness
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    is there any way to do it without X? I'm trying to install wayland – bobbaluba Oct 06 '12 at 04:24
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    This isn't necessarily correct. While most drivers supporting KMS have implemented `fbdev`, which is what your test actually tests for, if you've got NVIDIA KMS setup, your test will fail despite KMS being enable. KMS is not fbdev. If you've got `fbdev` you've got KMS, but it is not the case that without `fbdev` you do not have KMS. – Thor Feb 22 '17 at 20:17