kernel-packages team mailing list archive

[Adam Honse <1349679@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

After upgrading my laptop to the 14.10 alpha release, I no longer get
any display after booting past GRUB.  I select Ubuntu from the GRUB menu
and then the display shuts completely off (including backlight) and
remains off until I hard-reset the machine.  It does appear to continue
booting in the background but no combination of keys (ctrl+alt+f#, fn+f4
[monitor hotkey], ctrl+alt+backspace, etc) will wake the display.  If I
reboot back to my old 3.13 kernel from 14.04 it boots up properly with
the display working fine.  It did this with 3.15 as well, both from the
kernel PPA and from the 14.10 alpha repository.

I had a similar issue with kernel 3.12, in which I would see boot
messages but the display would shut off when X started.  This seems to
be due to my configuration being not well supported.  The laptop is a
dual AMD system with an AMD A10-4600M APU and a discrete AMD Radeon HD
7730M 2GB GPU.  I've determined that the display outputs (LVDS LCD,
HDMI, and VGA) are off of the integrated APU graphics while the 7730M is
only a render offload GPU.  I cannot disable the discrete GPU in the
very restrictive BIOS, thus both GPUs are available when booting the
machine.

I have configured VirtualBox on my Windows partition to be able to boot
the physical partition so I can access it that way even if the kernel
doesn't boot.  I can also boot into recovery mode on the 3.15/3.16
kernels just fine, though the Radeon graphics do not work if I try to
load X and it falls back to llvmpipe.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1349679

Title:
  Ubuntu 14.10 - No display with kernel 3.16 generic on HP dv6z 7000
  (AMD APU + AMD GPU)

Status in “linux” package in Ubuntu:
  New

Bug description:
  After upgrading my laptop to the 14.10 alpha release, I no longer get
  any display after booting past GRUB.  I select Ubuntu from the GRUB
  menu and then the display shuts completely off (including backlight)
  and remains off until I hard-reset the machine.  It does appear to
  continue booting in the background but no combination of keys
  (ctrl+alt+f#, fn+f4 [monitor hotkey], ctrl+alt+backspace, etc) will
  wake the display.  If I reboot back to my old 3.13 kernel from 14.04
  it boots up properly with the display working fine.  It did this with
  3.15 as well, both from the kernel PPA and from the 14.10 alpha
  repository.

  I had a similar issue with kernel 3.12, in which I would see boot
  messages but the display would shut off when X started.  This seems to
  be due to my configuration being not well supported.  The laptop is a
  dual AMD system with an AMD A10-4600M APU and a discrete AMD Radeon HD
  7730M 2GB GPU.  I've determined that the display outputs (LVDS LCD,
  HDMI, and VGA) are off of the integrated APU graphics while the 7730M
  is only a render offload GPU.  I cannot disable the discrete GPU in
  the very restrictive BIOS, thus both GPUs are available when booting
  the machine.

  I have configured VirtualBox on my Windows partition to be able to
  boot the physical partition so I can access it that way even if the
  kernel doesn't boot.  I can also boot into recovery mode on the
  3.15/3.16 kernels just fine, though the Radeon graphics do not work if
  I try to load X and it falls back to llvmpipe.

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