XRandR EDID missed with Cedar on LVDS
alexdeucher at gmail.com
Wed Nov 2 14:41:30 PDT 2011
On Wed, Nov 2, 2011 at 5:03 PM, Kai-Uwe Behrmann <ku.b at gmx.de> wrote:
> While testing a ATI Cedar equiped laptop I could not get the EDID for the
> interal LVDS in user space. I tried xrandr and xcmddc with no results. But
> the /var/log/Xorg.0.log showed that EDID was detected and hwinfo gives the
> monitor manufacturer. Still user space applications needs the complete data
> block to configure the monitor.
Can you post your xorg log and dmesg output? There are several possibilities:
1. Your panel does not provide an EDID. The driver is still able to
determine the native mode timings from tables in the vbios.
2. Your EDID has a bad checksum/etc. and the kernel drm EDID validator
You can try the patch on that bug and see if it helps.
> The driver is Radeon-1.3.0 build from git master 80ba041a .
> Here some more details:
That bug just looks like a random collection of things vaguely to EDIDs.
More information about the xorg