[Bug 101483] A10-8780P (Carrizo) + R7 M260/M265 does not boot without any "workaround" parameter.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101483

            Bug ID: 101483
           Summary: A10-8780P (Carrizo) + R7 M260/M265 does not boot
                    without any "workaround" parameter.
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: lx at o2mail.de

This bug has been reported at  launchpad.net, #163915
My notebook is a HP Pavilion 17-g164ng with an AMD A10-8780P APU.

The sytem (Ubuntu 16.04.2, kernel 4.8.0, UEFI) does not work when not booted
using workaround parameters:


nomodeset: resolution 800x600
nomodeset xforcevesa: 1600x900 (optimal resolution)
amd_iommu=off: "boot finished" sound within a minute, black screen, ssh login
possible
no parameter: no boot, no (remote) access, no dmesg, shut down by pressing  off
button for several seconds.

I have reported this bug at  launchpad.net on  2016-11-05.

At that time I used 16.04.1, kernel 4.4.0.  While booting, the screen was
black, one flash, black backlight on-off-on. After more than three minutes,
remote (ssh) access was possible, reboot by SysRQ B.

Recently I tested upstream kernels.
The results depend on the update-state of the installation.

Using installed Version 16.04.2, kernel 4.8.0-36 for installation of the
upstream kernel, booting without workaround parameter:

"boot finished" sound after 45 sec., screen black, no further HDD activity, ssh
login possible, SysRQ reaction.

Using the actual, updated system, kernel 4.8.0-54 for installation of the
upstream kernel, booting without workaround parameter:

no "boot finished" sound, no remote login (ssh).
Reboot/shutdown by SysRQ keys after about 3 minutes possible.

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