directscreen apps are not working properly with intel_extreme

[pulkomandy]

I tried a lot of Allegro and SDL based apps. With VESA driver everything is ok. With intel_extreme driver, the display doesn't work well, sometimes it is all black, sometimes I see part of the screen in the top left corner.

When the app exits, the whole system freezes and I can't even get to KDL.

[jackburton]

Allegro, when in fullscreen, uses a BWindowScreen, which I tested a bit but not so much, and it could cause the problems you describe. That's strange you see them with SDL, too, since it doesn't really make use of BDirectWindow. Yes, it creates a BDirectWindow, but treats it as a normal window.

[jackburton]

Is this still valid ?

[pulkomandy]

I tried to run Allegro "shooter" example. I got the initial window asking to pick a video mode, and then once entering fullscreen I got a black screen. I could switch workspaces, but then app_server crashed, apparently while drawing DeskBar decorator frame?

[pulkomandy]

I get similar results with Allegro under VESA, so I assume the crash I was getting a few years ago is fixed. Allegro code being quite in bad shape, I think we can rule out remaining problems in the intel driver here.