http://bugs.freedesktop.org/show_bug.cgi?id=25607
Summary: drmCheckModesettingSupported fails if X loaded radeon
modeset=1 just before
Product: xorg
Version: git
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: Driver/Radeon
AssignedTo: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
If using KMS without loading radeon automatically during boot, X loads the
radeon kernel module at startup but drmCheckModesettingSupported fails. It
looks like drm sysfs files are not setup yet when drmCheckModesettingSupported
runs. My understanding is that X loads the radeon kernel module but it doesn't
wait long enough before trying to use what radeon is setting up in the kernel
and sysfs.
So X starts without enabling KMS support, which works but disables DRI2. Then
if I restart X, drm files are already setup, so KMS/DRI2 gets enabled this
time, but the display gets screwed up...
If I load radeon during boot, or if I load it manually before starting X,
everything looks good.
This is a Thinkpad T43 with rv370. Running Linux 2.6.32 (from Debian sid, with
RADEON_KMS not set), libdrm 2.4.16 with radeon experimental api enabled,
Xserver 1.7.3, xf86-video-radeon git master from yesterday, and Mesa 7.6.1-rc3.
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