Public bug reported:
I have reasonably good experience in installing and using Ubuntu. I have
installed various releases of Ubuntu on hundreds of machines so far.
There is a subtle problem in Ubuntu 14.04 kernel. It manifests itself
when copying large files. The screen gets filled with colored pixels.
The source file could either come from a mounted external disk or via
sftp.
The problem happens only with large files but not with smaller sizes.
The file I am testing with is about 5G in size.
After many trials, I have reduced the problem to this basic setup:
1. Install Ubuntu 14.04 Server 64-bit through standard installation. No need to
install any additional package. Reboot and login. You will be placed in a
console window.
2. sudo mount /dev/sdc2 ~/myextdrive
3. cp ~/myextdrive/mylargefile.mp4 ~/Temp/
After a couple of seconds during the copy operation, the screen gets completely
filled with colored pixels.
The system is still alive. After about five minutes, I can do a "sudo
reboot" (although I don't see what I am typing).
To ensure that the problem is only with 14.04, I formatted the disk and
installed 13.04 Server on the disk and tried steps 2 and 3. It works
with no problems.
Next, I ran "do-release-upgrade." This eventually upgraded to 13.10. I
tried steps 2 and 3 once again. No problems.
Next, I ran "apt-get update, upgrade, dist-upgrade, and do-release-
upgrade. This time the system was upgraded to 14.04. I tried steps 2 and
3 once again. The problem reappears.
I tried to run ubuntu-bug but there is no crash report that has been
generated. If there is any log information that you would like to see,
please let me know and I can send it.
Regards,
Peter
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1369374
Title:
Pixels on screen when copying large files in 14.04
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