Re: regression? no hdmi output on tegra124 (kernel 4.12)

[Paul Kocialkowski <contact-W9ppeneeCTY@public.gmane.org>]

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Le dimanche 09 juillet 2017 à 18:55 +0300, Paul Kocialkowski a écrit :
> Le vendredi 07 juillet 2017 à 14:28 +0100, Jon Hunter a écrit :
> > On 05/07/17 21:31, Anthony Eden wrote:
> > > I no longer have any HDMI output from either my Jetson TK1
> > > (tegra124-jetson-tk1) or Acer Chromebook 13 CB5-311
> > > (tegra124-nyan-big) in Linux 4.12. In 4.11 I had no problem
> > > starting
> > > up X server.
> > > 
> > > Lightdm tries to start on boot and /var/log/Xorg.0.log contains:
> > > 
> > > ...
> > > 
> > > [    10.723] (II) modesetting: Driver for Modesetting Kernel
> > > Drivers: kms
> > > [    10.723] (II) modeset(0): using drv /dev/dri/card0
> > > [    10.724] (II) modeset(0): Creating default Display subsection
> > > in
> > > Screen section
> > >         "Default Screen Section" for depth/fbbpp 24/32
> > > [    10.724] (==) modeset(0): Depth 24, (==) framebuffer bpp 32
> > > [    10.724] (==) modeset(0): RGB weight 888
> > > [    10.724] (==) modeset(0): Default visual is TrueColor
> > > [    10.724] (II) Loading sub module "glamoregl"
> > > [    10.724] (II) LoadModule: "glamoregl"
> > > [    10.724] (II) Loading /usr/lib/xorg/modules/libglamoregl.so
> > > [    10.726] (II) Module glamoregl: vendor="X.Org Foundation"
> > > [    10.726]    compiled for 1.19.3, module version = 1.0.0
> > > [    10.726]    ABI class: X.Org ANSI C Emulation, version 0.4
> > > [    10.726] (II) glamor: OpenGL accelerated X.org driver based.
> > > [    10.920] (II) glamor: EGL version 1.4 (DRI2):
> > > [    10.924] (II) modeset(0): glamor initialized
> > > [    10.924] (WW) modeset(0): No outputs definitely connected,
> > > trying again...
> > > [    10.925] (WW) modeset(0): Unable to find connected outputs -
> > > setting 1024x768 initial framebuffer
> > > [    10.925] (==) modeset(0): Using gamma correction (1.0, 1.0,
> > > 1.0)
> > > [    10.925] (EE) modeset(0): No modes.
> > > [    10.957] (II) UnloadModule: "modesetting"
> > > [    10.957] (II) UnloadSubModule: "glamoregl"
> > > [    10.957] (II) Unloading glamoregl
> > > [    10.957] (EE) Screen(s) found, but none have a usable
> > > configuration.
> > > [    10.957] (EE)
> > > Fatal server error:
> > > [    10.957] (EE) no screens found(EE)
> > > [    10.957] (EE)
> > > Please consult the The X.Org Foundation support
> > >          at http://wiki.x.org
> > >  for help.
> > > [    10.957] (EE) Please also check the log file at
> > > "/var/log/Xorg.0.log" for additional information.
> > > [    10.957] (EE)
> > > [    10.957] (EE) Server terminated with error (1). Closing log
> > > file.
> > > 
> > > ...
> > > 
> > > I am running the ArchLinuxARM linux-armv7 kernel (.config is
> > > attached), along with the ALARM userspace.
> > > 
> > > I've attached dmesg's from my Jetson TK1 and Chromebook. How can I
> > > help to debug this further?
> > 
> > Thanks for the report. I am seeing this too. Bisect is point to the
> > following commit, hopefully, Thierry and Mikko can comment ...
> > 
> > commit 404bfb78daf3bedafb0bfab24947059575cbea3d
> > Author: Mikko Perttunen <mperttunen-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> > Date:   Wed Dec 14 13:16:14 2016 +0200
> > 
> >     gpu: host1x: Add IOMMU support
> 
> Thanks! I have investigated a bit further and can pinpoint it to
> iommu_attach_device returning -ENODEV in drivers/gpu/host1x/dev.c's
> host1x_probe.
> 
> I'll keep investigating to find out what's going on with the IOMMU
> code.

I have a fix for it now and display is back to life. Hooray!

Will submit the patch ASAP, I'm not sure it's the exactly right way to
do it, but it does work.

Cheers,

-- 
Paul Kocialkowski,

developer of free digital technology and hardware support

Website: https://www.paulk.fr/
Coding blog: https://code.paulk.fr/
Git repositories: https://git.paulk.fr/ https://git.code.paulk.fr/

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