Bug 81391

Summary: nouveau E[ PFIFO][0000:01:00.0] read fault at 0x000020f000 [PTE] from BAR1/HOST_CPU on channel 0x00ffbdf000 [unknown]
Product: Drivers Reporter: Srihari Vijayaraghavan (linux.bug.reporting)
Component: Video(DRI - non Intel)Assignee: drivers_video-dri
Status: NEW ---    
Severity: normal    
Priority: P1    
Hardware: x86-64   
OS: Linux   
Kernel Version: 3.17.0 Subsystem:
Regression: No Bisected commit-id:
Attachments: kernel boot up messages extracted from syslog (/var/log/messages)
lspci & .config

Description Srihari Vijayaraghavan 2014-07-30 13:12:17 UTC
Created attachment 144731 [details]
kernel boot up messages extracted from syslog (/var/log/messages)

The error message displayed on the subject line floods the kernel log buffer:
nouveau E[   PFIFO][0000:01:00.0] read fault at 0x000020f000 [PTE] from BAR1/HOST_CPU on channel 0x00ffbdf000 [unknown]
...
[   33.807019] systemd-journald[550]: /dev/kmsg buffer overrun, some messages lost.

All of the useful messages I could extract out of syslog (/var/log/messages) based on the kernel boot up time stamp is attached to this report.

I've also provided lspci -vvv & my .config as well.

I was however pleasantly surprised that the X.org & KDE did come up & appear to be functioning fine, even including glxgears running smoothly as well.

Thank you for progressing Nouveau so far, so quickly & so nicely. And am happy to test any patch you may want me to.
Comment 1 Srihari Vijayaraghavan 2014-07-30 13:15:36 UTC
Created attachment 144741 [details]
lspci & .config
Comment 2 Srihari Vijayaraghavan 2014-07-30 13:21:04 UTC
Actually, seeing how the flooding hasn't stopped, I've rebooted it to Intel 4600 video chip, disabling GTX 860m in the BIOS/firmware. However, I'm happy to re-enable it and test any patch, if you want me to.

Thanks