http://bugzilla.kernel.org/show_bug.cgi?id=15112
Summary: Radeon KMS on RV250 gets wrong refresh rate.
Product: Drivers
Version: 2.5
Kernel Version: 2.6.33-rc5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI - non Intel)
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
When booting with KMS disabled, the ati UMS xorg driver properly sets the
display mode to [email protected]. xrandr reports the following modes:
$ DISPLAY=:0 xrandr
Screen 0: minimum 320 x 200, current 1400 x 1050, maximum 1400 x 1400
VGA-0 disconnected (normal left inverted right x axis y axis)
LVDS connected 1400x1050+0+0 (normal left inverted right x axis y axis) 0mm x
0mm
1400x1050 60.2*+
1280x1024 59.9 60.0
1280x960 60.0 59.9
1280x854 59.9
1280x800 59.8
1280x720 59.9
1152x768 59.8
1024x768 60.0 59.9
800x600 60.3 59.9
640x480 59.9 59.4
S-video disconnected (normal left inverted right x axis y axis)
However when booting with KMS enabled, all that appears is a black screen.
After verifying that fbcon is built into the kernel and that KMS is
initializing, I also found that the xserver had started up, but still with a
blank screen. After blindly logging in, I ssh'd into the box, and found the
following xrandr modes:
$ DISPLAY=:0 xrandr
Screen 0: minimum 320 x 200, current 1400 x 1050, maximum 4096 x 4096
VGA-0 disconnected (normal left inverted right x axis y axis)
LVDS connected 1400x1050+0+0 (normal left inverted right x axis y axis) 0mm x
0mm
1400x1050 60.5 + 60.0*
1280x1024 59.9 60.0
1280x960 60.0 59.9
1280x854 59.9
1280x800 59.8
1280x720 59.9
1152x768 59.8
1024x768 60.0 59.9
800x600 60.3 59.9
848x480 59.7
720x480 59.7
640x480 59.9 59.4
S-video disconnected (normal left inverted right x axis y axis)
It appears when using KMS, the correct refresh rate for the 1400x1050
resolution isn't found and instead is a rate that doesn't work with this panel
gets setup, resulting in a blank screen.
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