Messages in this thread | | | Date | Sun, 13 Nov 2005 12:06:18 +0100 | From | Samuel Thibault <> | Subject | Re: [PATCH] vgacon: Workaround for resize bug in some chipsets |
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Antonino A. Daplas, le Sun 13 Nov 2005 06:20:53 +0800, a écrit : > "I updated to the development kernel and now during boot only the top of the > text is visable. For example the monitor screen the is the lines and I can > only see text in the asterik area. > --------------------- > | **************** | > | * * | > | * * | > | **************** | > | | > | | > | | > ---------------------
Are you missing some left and right part too? What are the dimensions of the text screen at bootup? What bootloader are you using? (It could be a bug in the boot up text screen dimension discovery).
> I have a Silicon Graphics 1600sw LCD panel with a Number Nine Revolution 4 > video card."
Does vgacon.c properly discovers that it is a VGA board?
> This bug seems to be a glitch in the VGA core of this chipset. Resizing > the screen triggers the mentioned bug.
Do vga-only games (like old DOS-mode games) work with it?
> The workaround is to make vgacon avoid calling vgacon_doresize() if the > display parameters did not change.
I.e. never call it, actually.
> A definitive fix will need to be provided by someone who knows and has the > hardware.
I'm not sure it is hardware-specific. Maybe you have a combination of vga bios/bootloader/vga=ask/... that prevents vgacon.c from properly discovering the dimensions of the text screen.
Well, else it looks like a "safe side" patch: people now hit by such bug won't be hit any more unless using stty or such.
Regards, Samuel - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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