This has now hit mainline as the commit below:
commit 16b036af31e1456cb69243a5a0c9ef801ecd1f17
Author: Michel Dänzer <[email protected]>
Date: Mon Jan 19 17:53:20 2015 +0900
PCI: Fix infinite loop with ROM image of size 0
As this is CC: stable, we should expect this fix to hit our trees
naturally as a result via upstream stable. Marking this up to that
effect.
** Description changed:
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
** Tags added: kernel-bug-break-fix
** Also affects: linux (Ubuntu Trusty)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Vivid)
Importance: Medium
Status: Confirmed
** Also affects: linux (Ubuntu Utopic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Utopic)
Status: New => Confirmed
** Changed in: linux (Ubuntu Trusty)
Status: New => Confirmed
** Changed in: linux (Ubuntu Utopic)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Trusty)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1386973
Title:
Ubuntu 14.10 soft lockup with ATI Radeon R7 250 X
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