I've just installed Ubuntu 15.04 and I'm experiencing a trouble when I try to logout. I think this is a recurrent problem with Ubuntu since I already experienced this same problem with release 14.10 (the problem was gone by himself, I think...). When I try to logout, the whole system freezes instantly. TTYs aren't available and the only thing that works is Alt+SysRq+b (emergency reboot)... This happens when:
- I try to reboot, via the UI or using
reboot - I try to close my session (no reboot)
- I use
kill -9 -1
Also, the laptop doesn't enter the sleep mode when I close the lip.
On the Internet, I found a guy that replaces this line in /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
by:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=off"
This works, I can reboot the computer, but when rebooted, it have a lot of problems (keys repeated 25 times on a single keydown, wifi is down...).
I'm using Ubuntu GNOME 15.04.
EDIT: I've noticed graphics-related errors in the dmesg logs:
[ 7.577765] nouveau E[ PGRAPH][0000:01:00.0] HUB_INIT timed out
[ 7.577769] nouveau E[ PGRAPH][0000:01:00.0] 409000 - done 0x00000240
[ 7.577774] nouveau E[ PGRAPH][0000:01:00.0] 409000 - stat 0x00000000 0x00000000 0x00000000 0x00000000
[ 7.577778] nouveau E[ PGRAPH][0000:01:00.0] 409000 - stat 0x00000000 0x00000000 0x00000006 0x00000000
[ 7.577780] nouveau E[ PGRAPH][0000:01:00.0] 502000 - done 0x00000340
[ 7.577785] nouveau E[ PGRAPH][0000:01:00.0] 502000 - stat 0x80000000 0x00006500 0x00000000 0x00000000
[ 7.577789] nouveau E[ PGRAPH][0000:01:00.0] 502000 - stat 0x00000000 0x00000000 0x00000002 0x00000000
[ 7.577791] nouveau E[ PGRAPH][0000:01:00.0] 50a000 - done 0x00000340
[ 7.577796] nouveau E[ PGRAPH][0000:01:00.0] 50a000 - stat 0x80000000 0x00008e00 0x00000000 0x00000000
[ 7.577801] nouveau E[ PGRAPH][0000:01:00.0] 50a000 - stat 0x00000000 0x00000000 0x00000002 0x00000000
[ 7.577803] nouveau E[ PGRAPH][0000:01:00.0] 512000 - done 0x00000300
[ 7.577808] nouveau E[ PGRAPH][0000:01:00.0] 512000 - stat 0x00000000 0x00017f00 0x00000000 0x00000000
[ 7.577812] nouveau E[ PGRAPH][0000:01:00.0] 512000 - stat 0x00000000 0x00000000 0x00000000 0x00000000
[ 7.577814] nouveau E[ PGRAPH][0000:01:00.0] init failed, -16
[ 9.039096] wlan0: authenticate with e8:be:81:93:04:24
....
[ 12.794968] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95)
[ 12.795090] ACPI: \_SB_.PCI0.PEG0.PEGP: failed to evaluate _DSM
[ 12.795094] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95)
[ 27.813811] nouveau E[ DRM] failed to idle channel 0xcccc0000 [DRM]
[ 27.813874] sched: RT throttling activated
[ 27.864541] pci_pm_runtime_suspend(): nouveau_pmops_runtime_suspend+0x0/0xf0 [nouveau] returns -16
But if I use the nvidia drivers, I get a black screen at boot and I need to purge the nvidia drivers from the recovery mode. The reboot works in recovery mode, using the root console. So the problem is probably graphic-related...
