Re: Raspberry Pi and its 7" display

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On Tue, Dec 11, 2018 at 3:18 AM Kevin Cummings
<cummings@xxxxxxxxxxxxxxxxxx> wrote:
>
> On 12/10/18 9:20 PM, Peter Robinson wrote:
> >> Hi Folks,
> >>         Longtime Fedora user here.  Last winter, I got a Raspberry Pi, and
> >> installed F28 on it.  Using the HDMI output, it works well.  Recently, I
> >
> > Any reason for F-28 instead of F-29?
>
> Lazy?  I think you're lucky I upgraded it from the F27 I originally
> installed....
>
> >> picked up the Raspberry Pi 7" display (and case).  After hooking up the
> >> display to the Pi via the ribbon cable, I booted it up.
> >>
> >> The 7" display works well as the initial console, and I see all the
> >> usual messages go flying by.  At some point (when it decides to switch
> >> to graphics mode) the display goes blank.  Nothing on it.  I cannot
> >> switch even to a virtual console.  The new case blocks using the HDMI
> >> port, so I had to remove the Pi from the case (while leaving the ribbon
> >> cable attached to the display).  After plugging a monitor into the HDMI
> >> port, what I discovered was that the Pi boots using the display as
> >> console, then switches to the HDMI port for the X11 driver.  (not useful)
> >
> > If you block the vc4 driver it will continue to work as a pure non
> > accelerated display, at the moment when the accelerated driver
> > initialises it can't detect the DSI attached display so it goes blank.
>
> So if I blacklist the vc4 driver, will an X11 session start up on the
> display?  If not, can I modify the boot up to bring Linux up in command
> line only mode?  Will the virtual consoles work in that mode?
>
> I don't (yet) understand the uboot stuff.  In a PC, I can interrupt grub
> and edit the command line to put kernel options on the boot line.  I
> don't know how to do that with uboot.

U-Boot in basically a firmware so in the context you put it it's not
grub2 or like it, on aarch64 mode on the Raspberry Pi we have grub2,
in F-30 we should this for ARMv7 too, The extlinux boot menu is
rudimentary, it doesn't support editing.

> > The support status is documented in the Fedora Raspberry Pi FAQ [1]
>
> Yes, it talks about supporting the touchscreen display.  But there are
> two parts:  The graphics display, and the touch screen.  Is the graphics
> screen currently supported?

No

> I can wait for touchscreen support.
>
> >> How can I get the X11 display to come up on the 7" display in graphics
> >> mode.  What do I need?  A new xorg-x11-drv driver?  A newer kernel?
> >
> > The Raspberry Pi doesn't have, nor will ever have a xorg driver. The
> > driver is a 3D mesa accelerated driver, the 2D support is via glamor
> > (2D over 3D) to mesa.
>
> Sorry, in all the PCs I've every used, there has been a specific driver
> to get X11 to run (reasonably) on every different video card I've had to
> run X11 on.  I'm not familiar with using them as only frame-buffer.  So
> this is new territory for me.

X11 drivers are going away, even in the PC case, EG these days for new
intel devices it uses mesa/3D glamor for Xorg too.

> > The upstream open source driver we use doesn't yet fully support the
> > touch screen display, I don't believe it's far off but upstream is yet
> > to finish the work to have it supported.
>
> Yes, that's what [1] says.
>
> >> I'd like to turn this into a MythTV server (with a USB capture) and use
> >> the display as a system console with the ability to watch videos on it.
> >> (Yeah, I'm aware that its only a 800x400 screen.)  Failing that, I'd
>
> I should have said 800x480 screen, and I also see that text mode
> actually runs at 720x480?
>
> >> like to use it in a "tablet" mode and get used to the touch screen
> >> interface.
> >
> > Well when it's supported upstream it will be enabled.
> >
> > [1] https://fedoraproject.org/wiki/Architectures/ARM/Raspberry_Pi#Is_the_Raspberry_Pi_Touch_Display_supported.3F
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>
> Thanks for the help so far.
>
> --
> Kevin J. Cummings
> cummings@xxxxxxxxxxxxxxxxxx
> cummings@xxxxxxxxxxxxxxxxxxxxxxx
> kjchome@xxxxxxxxxx
> Registered Linux User #1232 (http://www.linuxcounter.net/)
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