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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.
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2 Answers 2

Reset to default
-1

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.

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2
  • 6
    is there any way to do it without X? I'm trying to install wayland
    – bobbaluba
    Commented Oct 6, 2012 at 4:24
  • 2
    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
    Commented Feb 22, 2017 at 20:17
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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."

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