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Bug 37

Summary: [PATCH] fbcon needs to save/restore the screeninfo for vc switches
Product: SDL Reporter: bartoldeman
Component: videoAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: 1.2.9   
Hardware: x86   
OS: Linux   
Attachments: fix for bug 37

Description bartoldeman 2006-01-09 22:32:48 UTC 
I observed that the original resolution is lost when I flip consoles back and forth using the alt-fn keys. This is using Linux kernel 2.6.14, radeonfb. The patch below fixes this. Perhaps this isn't meant to be used, and it's a kernel bug, but then it just works around a kernel bug ;)

By the way, does anyone know why SDL freezes the application when switched away using fbcon? It could catch a signal for flipping back, and provide a fake frame buffer at a fixed position so that the application can work in the background.

Using ctrl-alt-fn for flipping instead of alt-fn may help a few games that actually use that key combination. Would such a patch be accepted, or should something like that be configurable (environment
variable?)
Comment 1 bartoldeman 2006-01-09 22:36:55 UTC 
Created attachment 19 [details]
fix for bug 37
Comment 2 Ryan C. Gordon 2006-01-10 15:46:19 UTC 
(In reply to comment #0)
> I observed that the original resolution is lost when I flip consoles back and
> forth using the alt-fn keys. This is using Linux kernel 2.6.14, radeonfb. The
> patch below fixes this. Perhaps this isn't meant to be used, and it's a kernel
> bug, but then it just works around a kernel bug ;)

This is an SDL bug, although the whole VT system is a broken mechanism in my opinion for requiring things like this. I'll look at the patch and probably apply it soon.

> By the way, does anyone know why SDL freezes the application when switched away
> using fbcon? It could catch a signal for flipping back, and provide a fake
> frame buffer at a fixed position so that the application can work in the
> background.

I think that's a good idea; but we should manage that in a seperate bug (since this one will be flagged RESOLVED when I apply the patch in Attachment #19 [details].

> Using ctrl-alt-fn for flipping instead of alt-fn may help a few games that
> actually use that key combination. Would such a patch be accepted, or should
> something like that be configurable (environment
> variable?)

Do normal VTs that aren't running an SDL app use ALT-fn? I thought it was ctrl-alt-fn, which would mean this change would make very good sense. Otherwise, I'm inclined to leave it be for now.

--ryan.
Comment 3 Ryan C. Gordon 2006-01-10 15:53:22 UTC 
Patch is now in CVS...thanks!

Please open new bug entries for the dummy framebuffer and ctrl-alt-fn issues, if you like.

--ryan.
Comment 4 Ryan C. Gordon 2006-01-19 04:08:23 UTC 
Following up, I've created seperate bug entries for the other issues in Bug #49 and Bug #50.

--ryan.
Comment 5 Ryan C. Gordon 2006-01-27 11:23:11 UTC 
Setting Sam as "QA Contact" on all bugs (even resolved ones) so he'll definitely be in the loop to any further discussion here about SDL.

--ryan.