Bug 34180

Summary:	kernel FrameBuffer: bad vsync with buggy hardware
Product:	Gentoo Linux	Reporter:	crusaderky
Component:	[OLD] Core system	Assignee:	x86-kernel (DEPRECATED) <x86-kernel>
Status:	RESOLVED INVALID
Severity:	normal
Priority:	High
Version:	unspecified
Hardware:	All
OS:	All
Whiteboard:
Package list:		Runtime testing required:	---

Description crusaderky 2003-11-23 06:12:57 UTC

I've got a GeForce4 MX440, a AOC 9Glr 19'' CRC monitor and linux-2.6.0-test9-vanilla (but the problem doesn't change with any other 2.4 source, either).

My monitor has a bug so it can't say the correct vsync to the PC; i.e. at 1024x768 I get 60Hz instead of 85Hz, producing orrible deformations.
This is obviously fixed (in Windows as well as in XFree) by forcing the vsync to 85Hz.

However, I haven't found any way to force it using the kernel framebuffer mode (I use vesafb). I've already read the Documentation/fb/* docs without obtaining anything. I've already tried to use the parameter "video=vesafb:1024x768-32@85" as specified in modedb.txt but it seems to be ininfluent. The fbset utility doesn't seem to have any parameter to adjust vsync frequency, either.

Any suggestions?

Comment 1 Brian Jackson (RETIRED) gentoo-dev

2003-11-23 09:58:34 UTC

I've never heard of a way to set vsync, but that doesn't mean one doesn't exist. You may want to try the forums, or on irc in #gentoo on irc.freenode.net