Bug 246201

Created attachment 158211 [details]
mentioned Xorg.0.log file

It seems something wrong in xf86ExecX86int10 src/mi_driver.c line 3161.
http://gitweb.freedesktop.org/?p=xorg/driver/xf86-video-siliconmotion.git;a=blob;h=5c7124f2799dadfd241b41cbfc37e3320cbf29e9;hb=1a803a8f91a931c00106f9d3d41cfa5d74c19f55;f=src/smi_driver.c#l3161

It do success DPSM mode change using BIOS call, but result code (AX) doesn't
set properly. 

(gdb) p *(*(SMIPtr)(xf86Screens[0]->driverPrivate))->pInt10
$12 = {entityIndex = 0, scrnIndex = 0, cpuRegs = 0x57fee0, BIOSseg = 49152,
  inb40time = 0, BIOSScratch = 0x8245110 "\003P", Flags = 0,
  private = 0x82455a8, mem = 0x57f654, num = 16, ax = 20240, bx = 257, cx = 0,
  dx = 0, si = 0, di = 0, es = 0, bp = 0, flags = 12800, stackseg = 4096,
  Tag = 18432, ioBase = 0}

(I get this trace in infinity loop at line 3248. The ax should be 0x4f.)

After calling DPMS BIOS, the mmio-read stop working and go to infinity loop.

But this doesn't BIOS bug, because vbetool
(http://freshmeat.net/projects/vbetool/)
returns the proper(0x4f) result value and a mode witching works fine.

For now my workaround is to add "Option UseBIOS off" to xorg.conf.

I seem to be experiencing the same what I think is the same problem.  Everything
works perfectly until the screensaver kicks in, mine simply blanks the screen. 
When it does that you cannot access X.  You can login remotely and then X is
sitting at 90+% cpu usage.   I can then kill X and log in again.

I'm happy to supply whatever data can help to fix this problem.  At the moment
its making my laptop usage frustrating!

I eventually removed all traces of old X.conf and got it rebuilt but the problem
persists.  I'm using gnome-screensaver but I assume its using most of
xscreensaver anyway so it is the same problem.

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While I can't check on rawhide beacuase of Bug #443544,
I suppose this bug still be there.

This bug appears to have been reported against 'rawhide' during the Fedora 10 development cycle.
Changing version to '10'.

More information and reason for this action is here:
http://fedoraproject.org/wiki/BugZappers/HouseKeeping

This message is a reminder that Fedora 10 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
and issuing updates for Fedora 10.  It is Fedora's policy to close all
bug reports from releases that are no longer maintained.  At that time
this bug will be closed as WONTFIX if it remains open with a Fedora 
'version' of '10'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version' 
to a later Fedora version prior to Fedora 10's end of life.

Bug Reporter: Thank you for reporting this issue and we are sorry that 
we may not be able to fix it before Fedora 10 is end of life.  If you 
would still like to see this bug fixed and are able to reproduce it 
against a later version of Fedora please change the 'version' of this 
bug to the applicable version.  If you are unable to change the version, 
please add a comment here and someone will do it for you.

Although we aim to fix as many bugs as possible during every release's 
lifetime, sometimes those efforts are overtaken by events.  Often a 
more recent Fedora release includes newer upstream software that fixes 
bugs or makes them obsolete.

The process we are following is described here: 
http://fedoraproject.org/wiki/BugZappers/HouseKeeping

Fedora 10 changed to end-of-life (EOL) status on 2009-12-17. Fedora 10 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of 
Fedora please feel free to reopen this bug against that version.

Thank you for reporting this bug and we are sorry it could not be fixed.