[Nouveau] Display broken after resume from suspend

[Joshua J. Kugler]

I've added debugging command-line parameters to the kernel command line, per 
skeggsb and imirkin on #nouveau.

root at joyful:~# cat /proc/cmdline 
BOOT_IMAGE=/vmlinuz-5.3.0-26-generic root=/dev/mapper/vgubuntu-root ro quiet 
splash log_buf_len=8M nouveau.debug=disp=trace,bios=trace,i2c=trace 3

On this particular run, closing the lid and then opening got me back to the 
console, but then I tried running

echo mem > /sys/power/state

and it did not recover from that. That is, the laptop is awake, I can ssh in, 
screen back-light is on; black screen.

j


On Sunday, January 12, 2020 2:02:00 PM AKST Joshua J. Kugler wrote:
> Howdy! I've been doing a lot of troubleshooting, and haven't arrived at a
> solution yet.
> 
> Kernel log attached. VBIOS also attached.
> Ubuntu 19.10
> 
> $ uname -a
> Linux joyful 5.3.0-26-generic #28-Ubuntu SMP Wed Dec 18 05:37:46 UTC 2019
> x86_64 x86_64 x86_64 GNU/Linux
> $ dpkg -l|grep nouveau
> ii  libdrm-nouveau2:amd64                      2.4.99-1ubuntu1
> amd64        Userspace interface to nouveau-specific kernel DRM services --
> runtime
> ii  xserver-xorg-video-nouveau                 1:1.0.16-1
> amd64        X.Org X server -- Nouveau display driver
> $ lspci |grep VGA
> 01:00.0 VGA compatible controller: NVIDIA Corporation GT218M [NVS 3100M]
> (rev a2)
> 
> This is a Dell Latitude E6510, so not exactly bleeding edge. :)
> 
> The system boots just fine, and I can use the laptop without issue. Goes to
> sleep just fine. When I resume from sleep, the display is black, and will
> not come to life (the back light is on, though).  I can ssh in, and run all
> kinds of commands; restart the display manager does *not* bring it back to
> life.
> 
> Any tips would be greatly appreciated.
> 
> j


-- 
Joshua J. Kugler - Fairbanks, Alaska - joshua at azariah.com
Azariah Enterprises - Programming and Website Design
PGP Key: http://pgp.mit.edu/  ID 0x68108cbb73b13b6a
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