Public bug reported:
I maintain a set of older kiosks running a mix of stock Ubuntu 14.04 LTS
and 16.04. As we have gradually transitioned them to 16.04, we have
noticed that the machines running 16.04.3 now regularly exhibit problems
restoring from the blank screen which appears after a period of
inactivity.
This only occurs on the machines where we've installed 16.04. All of
the 16.04.3 installations are "fresh", that is, complete re-installs
from scratch, and we install all security and other updates on a regular
basis. This problem has persisted right from the beginning when we
started using 16.04.
Following a period of user inactivity, the screen goes blank; this is,
of course, expected. When the user tries to restore the session by
typing a key or moving the mouse, one of three outcomes occurs.
Sometimes, the session restores normally. Other times, the screen
remains blank regardless of all normal keyboard input, until a magic
SysRq sequence is performed. After Alt-SysRq-k, either the virtual
console resets to a login screen (as expected after this SysRq
sequence), or we get a kernel panic text screen (see attached screen
photo) and can only restore via a hard power-cycle reboot.
I will continue to try to capture a better trace output from one of
these conditions, perhaps from /var/log/kern.log or by installing linux-
crashdump (although these old machines may not have enough memory for
the stock package). But in the meantime, I'm attaching a photo of the
kernel panic we see, which suggests a problem may reside in the Radeon
driver ... which would seem possible, given the general blank-screen no-
resume problem on these systems.
Any advice on how to further capture any other needed details would be
appreciated. Thanks very much!
** Affects: ubuntu
Importance: Undecided
Status: New
** Attachment added: "radeon_kernel_panic1.jpg"
https://bugs.launchpad.net/bugs/1763273/+attachment/5111739/+files/radeon_kernel_panic1.jpg
** Description changed:
I maintain a set of older kiosks running a mix of stock Ubuntu 14.04 LTS
and 16.04. As we have gradually transitioned them to 16.04, we have
noticed that the machines running 16.04.3 now regularly exhibit problems
restoring from the blank screen which appears after a period of
inactivity.
This only occurs on the machines where we've installed 16.04. All of
the 16.04.3 installations are "fresh", that is, complete re-installs
from scratch, and we install all security and other updates on a regular
- basis. This problem has persisted right from the beginning when started
- using 16.04.
+ basis. This problem has persisted right from the beginning when we
+ started using 16.04.
Following a period of user inactivity, the screen goes blank; this is,
of course, expected. When the user tries to restore the session by
typing a key or moving the mouse, one of three outcomes occurs.
- Sometimes, the session restores normally.
-
- Other times, the screen remains blank regardless of all normal keyboard
- input, until a magic SysRq sequence is performed. After Alt-SysRq-k,
- either the virtual console resets to a login screen, or we get a kernel
- panic text screen (see attached screen photo).
+ Sometimes, the session restores normally. Other times, the screen
+ remains blank regardless of all normal keyboard input, until a magic
+ SysRq sequence is performed. After Alt-SysRq-k, either the virtual
+ console resets to a login screen (as expected after this SysRq
+ sequence), or we get a kernel panic text screen (see attached screen
+ photo) and can only restore via a hard power-cycle reboot.
I will continue to try to capture a better trace output from one of
these conditions, perhaps from /var/log/kern.log or by installing linux-
crashdump (although these old machines may not have enough memory for
the stock package). But in the meantime, I'm attaching a photo of the
kernel panic we see, which suggests a problem may reside in the Radeon
- driver ... which would seem possible, given the general blank screen no-
+ driver ... which would seem possible, given the general blank-screen no-
resume problem on these systems.
Any advice on how to further capture any other needed details would be
appreciated. Thanks very much!
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1763273
Title:
kernel panic in Radeon driver while screen blank
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+bug/1763273/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
