[Bug 36596] Re: [Mobility M6 LY] System freeze with DefaultDepth 16

[Tormod Volden]

** Attachment added: "Xorg.0.log"
   http://launchpadlibrarian.net/23267711/Xorg.0.log

** Description changed:

  Forwarding this (ancient) bug from a Ubuntu reporter:
  https://bugs.edge.launchpad.net/xserver-xorg-driver-ati/+bug/36596
  
  [Problem]
  By default, the DefaultDepth is set to 24, however on this hardware this disables DRI.  But when setting DefaultDepth to 16 it causes a system freeze.
  
  Possibly there is some relation with bug 16365, which has similar
  symptoms on the same hardware.
  
  [lspci]
+ 01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Radeon Mobility M6 LY [1002:4c59]
+ 	Subsystem: Compaq Computer Corporation Device [0e11:b11b]
  (II) PCI: 00:00:0: chip 8086,3575 card ffff,ffff rev 02 class 06,00,00 hdr 00
  (II) PCI: 01:00:0: chip 1002,4c59 card 0e11,b11b rev 00 class 03,00,00 hdr 00
  (--) PCI:*(1:0:0) ATI Technologies Inc Radeon Mobility M6 LY rev 0, Mem @ 0xd8000000/27, 0xd0100000/16, I/O @ 0x2000/8
  
  [Original Report]
  This seems to be a general problem (it also occured when i used bug-buddy) but i can reproduce it easily using pan, among other methods.
  
  The steps to reproduce the problem are:
  a) run pan
  b) update a newsgroup
  c) quickly open task manager, stop the update task (using the stop icon)
  d) click on the "trash" icon
  e) system is frozen,
          e.g. mouse not moving, even ctrl-alt-f1 does not work. I also have a web server (apache2) running, and it is not accessible after the freeze.
  
  Another way to reproduce the problem is:
  a) run glxgears
  b) move the window around.
  
  Workarounds:
  a) After changing from ubuntulooks to clearlooks theme, it occurs much less frequently.
  
  b) After changing from xorg "ati" to "vesa" driver, it has not occurred
  yet (been using a few hours). (used together with "ubuntulooks" theme )
  
  c) option "RenderAccel 0" works
  
  d) Disabling modules "dri" and "glx" works (at least as of June 2007)
  
  I first reported it against:
  - latest dapper as of 20060325,
  - pan 0.14.2.91.
  - kernel 2.6.15-19-686 #1 SMP PREEMPT Mon Mar 20 17:33:20 UTC 2006 i686 GNU/Linux . (I have also tried on kernel 2.6.15-19-386).
  
  Also reported as still occurring on:
  * Gutsy Alpha 4 (2007-08-21) - still freezes at DefaultDepth 16
  * Hardy Alpha 6 (2008-03-10)  - still freezes at DefaultDepth 16
  * -ati 6.9.0 - still freezes at DefaultDepth 16
  * [TODO:  Test against 6.11.0]
  
  My problems with "ati" does not seem 3D related, I have tried disabling
  "dri" and "glx" modules and it still crashes.
  
  My system is a PIII Mobile 1GHz, 384 MB RAM, and Mobility Radeon M6 LY
  graphics.
  
  I am still able to get a system freeze at defaultDepth 16. At depth 16
  DRI is on (at depth 24 there is not enough memory for DRI).
  
  Having said that, I myself do NOT have any requirements for defaultDepth 16 or DRI (just wanted to try some of the desktop effects).
  I would not object if defaultDepth 16 is not supported for an 8Megabyte M6.
  
  In trying older drivers, the problem seems to have started between
  6.5.7.3 and 6.5.8.

-- 
[Mobility M6 LY] System freeze with DefaultDepth 16
https://bugs.launchpad.net/bugs/36596
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