[Bug 306916] [NEW] [intrepid] screen shows temporary garbage then goes blank, falls into low-graphics mode

[Scott Wegner]

Public bug reported:

Binary package hint: xserver-xorg-video-intel

I installed Ubuntu Intrepid on a friend's laptop, but she is getting
sporadic X crashes during normal usage.  Last time it crashed, she was
simply running Firefox, Rhythmbox, and Thunderbird.   I don't think any
of these applications are to blame, but it's just to show that she
wasn't using any complex 3D graphics.

Specifically, after working on the laptop for some period of time, the
screen will start to show some garbage artifacts.  Then quickly (within
a second or two), the screen will go black, with subtle shades of
green/blue.  After a little bit (~10 seconds), an error message will
come up saying "Ubuntu is running in low-graphics mode", and also
mentions the following error message (twice):

(EE) intel(0): [drm] failed to remove DRM signal handler

I was able to SSH into the computer and pull some log files, etc.
Looking up the error messages turns up many other xorg bug reports, but
they don't seem to be quite the same.  It's hard to debug this because
I'm not sure how to trigger the bug.  I can't easily obtain a backtrace
because it isn't my laptop, and she generally doesn't keep it running
when not in use.

So, in hopes that somebody else may know more about this crash, (or at
least find the output useful), I'm posting some log files and the output
of lspci -vvvnn.  In particular:

Xorg.0.log, after the crash.  The relevant error appears to be:
Error in I830WaitLpRing(), timeout for 2 seconds
pgetbl_ctl: 0x3ffc0001 getbl_err: 0x00000000
ipeir: 0x00000000 iphdr: 0x66014140
LP ring tail: 0x000001c0 head: 0x0001a95c len: 0x0001f001 start 0x00000000
eir: 0x0000 esr: 0x0001 emr: 0xffff
instdone: 0xfa41 instpm: 0x0000
memmode: 0x00000306 instps: 0x800f04c4
hwstam: 0xfffe ier: 0x0002 imr: 0x0000 iir: 0x0070
Ring at virtual 0xa7841000 head 0x1a95c tail 0x1c0 count 5657
...
Ring end
space: 108436 wanted 131064
(II) intel(0): [drm] removed 1 reserved context for kernel
(II) intel(0): [drm] unmapping 8192 bytes of SAREA 0xf8a29000 at 0xb7ff4000
(II) intel(0): [drm] Closed DRM master.

Fatal server error:
lockup

Also, gdm/:0.log.  The relevant error appears to be:
error setting MTRR (base = 0xd0000000, size = 0x007b0000, type = 1) Invalid argument (22)
7648 5119

This is on a Toshiba Satellite A105-S4254, running Ubuntu Intrepid x86,
fully-updated as of 12/10/08.  Please let me know if there's anything
else I can provide.

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

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[intrepid] screen shows temporary garbage then goes blank, falls into low-graphics mode
https://bugs.launchpad.net/bugs/306916
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