[RFC] X Display Failures in Suspend and Resume

[Matthew Garrett]

On Fri, Nov 07, 2008 at 01:47:48PM -0800, Jim Lieb wrote:
> Pete asked me to look into the suspend/resume failures and report back on what 
> is going on to cause X to fail on some notebook/laptop machines.  The attached
> pdf is a relatively final draft of the report including a proposal for fixing 
> the problem.

Are you sure this diagnosis is correct? The resume from hibernation case 
is made rather more "interesting" due to usplash also being involved, 
but the suspend to RAM case is no more inherently racy than the normal 
VT switching case. Not having video on resume from RAM will generally be 
down to the kernel failing to restore graphical state, something it can 
currently only do for Intel hardware[1]. The userspace workarounds for 
reinitialising the graphics are certainly not guaranteed to work 
reliably.

[1] Though there are still a few bugs there, which can result in failure 
even on hardware that /should/ be working
-- 
Matthew Garrett | mjg59 at srcf.ucam.org