Description of problem:
When booting with a DTB using kernels 3.13+ all platforms lack a working display. Booting without a DTB in vexpress continues to work.
This seems to affect all boards tested - specifically the Trimslice and Pandaboard which were working prior.
I can confirm this on a pandaboard. In the meantime it can boot with a DTB for current kernels on fedora 20, but the HDMI display is not working.
In prior kernel versions without DTB I a get display at full 1920x1080 pixel resolution.
Display is working again on the Pandaboard in kernel-3.15.0-0.rc5.git2.10.fc21+ using rawhide nightlies.
F20 is now on a 3.15 kernel in stable updates. Does this mean this is fixed for F20/F21/F22 now? F19 is still on 3.14.
FYI, F19 is staying on 3.14.y until EOL. If 3.15 is required for this bug then users will need to migrate to F20.
I recently installed Fedora 20 on my trimslice. This installer image works well, however after a system update to Kernel 3.15.10 there is no longer output on the hdmi port.
I talked about this yesterday on the #fedora-arm irc channel. The problem is that the tegra_drm module is not added to initrd.
Manually running "modprobe tegra_drm" restores the output on the hdmi port.
When I asked about the cause of this, I got this reply:
[Thursday 04 September 2014] [18:56:32] <nchauvet> issue with the way dracut detect the drm driver, fixed in f22 dracut
Fedora 22 is still a long way ahead of us. So would it be possible to backport this fix to Fedora 20 ?
(In reply to firstname.lastname@example.org from comment #5)
> I talked about this yesterday on the #fedora-arm irc channel. The problem is
> that the tegra_drm module is not added to initrd.
The autoloading of the tegra_drm is fixed with backport of:
that is currently available on kernel 3.16.
This kernel should hit f20 updates at some point.