[Nouveau] Display broken after resume from suspend

Tue Jan 14 22:05:28 UTC 2020

Another log, per Lyude on #nouveau.

j

On Tuesday, January 14, 2020 8:52:51 AM AKST Joshua J. Kugler wrote:
> Here we go!
> 
> j
> 
> On Tuesday, January 14, 2020 7:08:20 AM AKST Ilia Mirkin wrote:
> > Hi Joshua,
> > 
> > Not a fix for your issue, but Ben noticed this (and fixed it):
> > 
> > https://github.com/skeggsb/nouveau/commit/024bda7d2b0c3b0731433d60a494c78a
> > b5 8cb216
> > 
> > which is what causes us to even try 540MB/s link training. However
> > with this fix applied, it'll just give up faster. I'm told eDP is
> > generally a single lane, and you're trying to get more than 270MB/s.
> > So ... the question is ... why is it trying to do 10bpc. One likely
> > reason is that the display_info.bpc == 0 for some reason (and we,
> > rather questionably, default to 10bpc for bandwidth determination).
> > There's no concrete theory as to what that reason might be, but it
> > would explain what's going on.
> > 
> > After resuming into a bad state, can you grab the contents of
> > /sys/class/drm/card0-eDP-1/edid (you'll have to cat it or something)?
> > My hope is that it's somehow messed up.
> > 
> > Also, can you add "drm.debug=0x1e" to the boot cmd line, in addition
> > to the bits you have already? Should provide some more info, perhaps
> > some of it will even be relevant.
> > 
> > Thanks,
> > 
> >   -ilia
> > 
> > On Mon, Jan 13, 2020 at 6:48 PM Joshua J. Kugler <joshua at azariah.com> 
wrote:
> > > 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_______________________________________________
> > > Nouveau
> > > mailing list
> > > Nouveau at lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/nouveau

-- 
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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