Kernel Bug Tracker – Bug 20982
Radeon: Display doesn't fit the screen size
Last modified: 2012-08-14 11:21:05 UTC
Created attachment 34512 [details]
The dmesg with 2.6.36 kernel
I've got a strange bug since I've installed the new 2.6.36 kernel. KMS configure my screen with the right resolution, but the display doesn't seem to fit the actual screen size. When I look at the properties into the screen OSD, it shows that it works at 1920x1080 (1080P). As a result of this, the resolution is correct but the display is smaller than this, so I've got black lines and my display is blurred.
I could reproduce the bug on two different screens, two different radeon GPUs and with two different configurations of the kernel.
As I use an HDMI connection, I tried with the VGA one but it doesn't permit me to display such a large resolution.
Created attachment 34522 [details]
The display with 188.8.131.52 kernel. No black lines.
Created attachment 34532 [details]
Display with 2.6.36 kernel. Black lines around.
This is a new feature to compensate for the overscan imposed by lots of TVs. To disable it:
xrandr --output HDMI-0 --set underscan off
This bug is a duplicate of:
*** This bug has been marked as a duplicate of bug 20142 ***