Source: linux
Version: 3.14.4-1
Severity: normal
Hi!
I installed Debian on my old Mac Mini G4 today (see installation report [1])
and tried to get X up and running after rebooting the machine.
Unfortunately, I couldn't get X to work with anything but the fbdev driver.
After looking through the logs, I found that Xorg.0.log contained these lines:
(II) [KMS] drm report modesetting isn't supported.
Which explains that both xf86-video-radeon and xf86-video-modesetting weren't
working. I inspected the kernel configuration for the powerpc kernel and found
something interesting, CONFIG_DRM_RADEON_UMS is currently still enabled here
while it's disabled on x86_64 where modesetting on radeon is working fine.
On powerpc:
root@test-adrian1:/boot# uname -a
Linux test-adrian1 3.14-1-powerpc #1 Debian 3.14.4-1 (2014-05-13) ppc GNU/Linux
root@test-adrian1:/boot# grep CONFIG_DRM_RADEON_UMS config-`uname -r`
CONFIG_DRM_RADEON_UMS=y
root@test-adrian1:/boot#
On x86_64:
root@z6:/boot> uname -a
Linux z6 3.14-1-amd64 #1 SMP Debian 3.14.4-1 (2014-05-13) x86_64 GNU/Linux
root@z6:/boot> grep CONFIG_DRM_RADEON_UMS config-`uname -r`
# CONFIG_DRM_RADEON_UMS is not set
root@z6:/boot>
I'm currently building a local kernel to verify that enabling
CONFIG_DRM_RADEON_UMS
disables KMS for radeon, but since this CONFIG option is deprecated anyway and
UMS is no longer supported in xf86-video-radeon, I'd like to ask to have
CONFIG_DRM_RADEON_UMS disabled on powerpc (and all other architectures
where it's still enabled).
Cheers,
Adrian
-- System Information:
Debian Release: jessie/sid
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: powerpc (ppc)
Kernel: Linux 3.14-1-powerpc
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL
set to en_US.UTF-8)
Shell: /bin/sh linked to /bin/dash
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