[Nouveau] Display broken after resume from suspend

Tue Jan 14 17:52:51 UTC 2020

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/024bda7d2b0c3b0731433d60a494c78ab5
> 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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