Re: Debian 8 Display corruption and previous desktop revelation during login (nouveau)

2015-04-30 Thread Nick
On 30/04/15 09:50, Darac Marjal wrote:
> I would suggest filing a bug against the video driver (nouveau, in this
> case).

Thanks Darac, I've filed a bug in xorg-server-video-nouveau.


In case anyone's interested, here's the bug:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=783860


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Re: Debian 8 Display corruption and previous desktop revelation during login (nouveau)

2015-04-30 Thread Darac Marjal
On Wed, Apr 29, 2015 at 08:04:35PM +0100, Nick Booker wrote:
>Hi.
> 
>I'm getting display corruption during login on the latest Debian 8
>(Jessie), installed from scratch on an emptied hard disk.
> 
>I have the MATE desktop environment, and am using the nouveau graphics
>driver.
> 
>This didn't happen with my previous OSes (Debian Wheezy, Linux Mint 17.1
>or Parabola GNU/Linux bleeding edge).
> 
>If I boot my machine from cold, having just plugged in:
> 
>Boot messages progress to lightdm fine
>All looks normal while interacting with lightdm
>After entering my login details, before showing the usual MATE desktop
>elements and wallpaper, the screen is corrupted for a couple of seconds.
>During that period it is green with various coloured (mostly purple)
>dots in seemingly-random places.
> 
>If I then reboot or shut down and start back up without unplugging and
>waiting for the motherboard to power down, during my next login, rather
>than the green with purple dots, I get a collage of bits of my previous
>session's windows (even some long closed before shutdown) displayed.
> 
>Please can anyone help me to debug and fix this issue?
> 
>I haven't filed a bug because I don't know where the issue lies at the
>moment (kernel/systemd/xf86-video-nouveau/...?)

I would suggest filing a bug against the video driver (nouveau, in this
case). I would guess that, as an optimization, it's allocating video
memory, but not clearing it. Then, when the display comes on, the
contents of that memory is shown. I suspect the fix would be to either
zero the video memory (so giving you a black screen) or to not activate
the display until the first image has been drawn to it.

There is a possible security angle here, so report it as a bug and, if
it's actually the kernel that should have been responsible for clearing
that memory, I'm sure the nouveau people will re-assign the bug.

> 
>I don't mind poking around source code if necessary with a bit of
>hand-holding.
> 
>Selected details from lspci, glxinfo and dmesg in the following paste:
> 
>[1]http://paste.debian.net/169967/
> 
>Thanks,
> 
>Nick
> 
>--
>Sent from my Android device with K-9 Mail. Please excuse my brevity.
> 
> References
> 
>Visible links
>1. http://paste.debian.net/169967


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Re: Debian 8 Display corruption and previous desktop revelation during login (nouveau)

2015-04-29 Thread Nick
On 29/04/15 20:04, Nick Booker wrote:
> Selected details from lspci, glxinfo and dmesg in the following paste:
> 
> http://paste.debian.net/169967/

Sorry that one was set to expire too quickly.  Here's a new one set to
expire never:

http://paste.debian.net/170024/



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Debian 8 Display corruption and previous desktop revelation during login (nouveau)

2015-04-29 Thread Nick Booker
Hi.

I'm getting display corruption during login on the latest Debian 8
(Jessie), installed from scratch on an emptied hard disk.

I have the MATE desktop environment, and am using the nouveau graphics
driver.

This didn't happen with my previous OSes (Debian Wheezy, Linux Mint 17.1
or Parabola GNU/Linux bleeding edge).

If I boot my machine from cold, having just plugged in:

Boot messages progress to lightdm fine
All looks normal while interacting with lightdm
After entering my login details, before showing the usual MATE desktop
elements and wallpaper, the screen is corrupted for a couple of seconds.
During that period it is green with various coloured (mostly purple)
dots in seemingly-random places.

If I then reboot or shut down and start back up without unplugging and
waiting for the motherboard to power down, during my next login, rather
than the green with purple dots, I get a collage of bits of my previous
session's windows (even some long closed before shutdown) displayed.

Please can anyone help me to debug and fix this issue?

I haven't filed a bug because I don't know where the issue lies at the
moment (kernel/systemd/xf86-video-nouveau/...?)

I don't mind poking around source code if necessary with a bit of
hand-holding.

Selected details from lspci, glxinfo and dmesg in the following paste:

http://paste.debian.net/169967/

Thanks,

Nick

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.