Has anyone had problems, suggest a solution for screen flicker on a Quantex
I-14xx (same as Dell I7000, etc.). This notebook has an ATI Rage Lt Pro chip w/
8MB and a 1024x768 LCD. I am currently running RedHat 6.1 with the
XF86_Mach64-3.3.5 server. Everything seems to work just fine with the default,
non-framebuffer kernel; however, when I run a kernel with fb turned on, the
screen under XFree86 has a very bad flicker. Note that this only occurs when I
try to run the X server, I could not see any flicker in the term console and a
couple of SVGA programs. In comparing the startup output of XFree86, the only
significant difference is the non-fb case has
(--) Mach64: 1024x768 panel ( ID 4 ) detected; clock 65.14 MHz
while the fb case reads.
(--) Mach64: 1024x768 panel ( ID 4 ) detected; clock 25.12 MHz
The former makes sense since what little documentation I can find says the
graphics is connected to the LCD thru a 65MHz interface (is this the right
interpretation?). In both cases, I have defined only one monitor entry, which
seems to work just fine,
Modeline "1024x768" 65 1024 1032 1176 1344 768 771 777 806
-hsync -vsync
and both cases report back this is what is being used.
(**) Mach64: Mode "1024x768": mode clock = 65.00
I tried tweaking XF86Config with clock settings and only succeeded in really
screwing things up (the documentation says this shouldn't be necessary as
everything is auto-detected and is probably a bad thing to do, guess they were
right). I also tried running the XF86_FBdev server, but couldn't get it to
startup correctly.
Update: OK, I went out and did some more searching before firing this off.
On 9/10 there was some discussion of this same problem in comp.os.linux.x. One
person gave back a suggestion that works without flicker but this is with the
FBdev server which is much slower than the Mach64 server. The discusion quickly
degraded into "I have that problem too" and "this really sucks without the fb
console" but their wasn't any resolution. Kind of the same thing I was
thinking.
Any help would be greatly appreciated, thanks in advance.
Adrian
