kernel-packages team mailing list archive

[Christian Zigotzky <1386973@xxxxxxxxxxxxxxxxxx>]

Hi All,

Thank you very much for fixing this bug. Have you applied this fix to
the 3.13 LTS kernel yet? If not, could you apply this fix to the LTS
kernel 3.13, please?

Kernel 3.13:
http://www.ubuntuupdates.org/package/canonical_kernel_team/trusty/main/base
/linux-source-3.13.0

Thanks in advance.

Christian

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https://bugs.launchpad.net/bugs/1386973

Title:
  Ubuntu 14.10 soft lockup with ATI Radeon R7 250 X

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Utopic:
  Fix Released
Status in linux source package in Vivid:
  Fix Released

Bug description:
  I have a VGA controller Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde XT [Radeon HD 7770/8760 / R7 250X].
  When I boot from the Utopic DVD I get to the language menu and I can select try ubuntu without installing, but after a few sencods I get "BUG: soft lockup - CPU#0 stuck for 22s!'" and the message just repeats every 22 secods forever.

  I tried setting nomodeset using the F6 menu, but I got exactly the
  same result.

  This is Ubuntu 14.10 64 bits which basically seems unable to boot with
  that hardware.

  The experience was the same with 14.04, but I thought 14.10 would be
  better. In 14.04 disabling the video card and booting off the
  integrated graphics let me set nomodeset in /etc/default/grub and I
  was able boot with the R7 250X with the VESA driver. Installed
  Catalyst afterwards.

  
  ===
  break-fix: - 16b036af31e1456cb69243a5a0c9ef801ecd1f17

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