[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

Re: Incorrect refresh rate with i915 video on FC4



Am So, den 26.06.2005 schrieb Ryan J. McDonough um 19:28:

> I'm having a heck of a time getting my display to work properly. I have
> an HP Pavilion a730n which has an i915 graphics board running Fedora
> Core 4. The display it's hooked up to is a Samsung 770TFT. I run the
> display at 1280 x 1024. Under Windows the driver would always revert
> back to 60Hz on each reboot, which always makes the display blurry.
> However, I could always adjust the refresh rate to 72Hz and everything
> was peachy. 
> 
> Xorg is a different story. No matter what I do, the display seems to
> behave as if it's running at 60Hz but the Gnome Screen Resolution claims
> it's running at 76Hz (which is out of range). I've tried creating a
> ModeLine which seems to make things a little better, but not great.
> Here's the parts of my Xorg config that is relevant:
> 
> Section "Monitor"
> 	Identifier   "Monitor0"
> 	VendorName   "Monitor Vendor"
> 	ModelName    "S/M 770TFT"
> 	DisplaySize  340	270
> 	HorizSync    30.0 - 81.0
> 	VertRefresh  56.0 - 85.0
> 	Option	    "DPMS" 
> 	ModeLine     "1280x1024"  138.54  1280 1368 1504 1728  1024 1025 1028
> 1069 -HSync +Vsync
> 	# 1280x1024 @ 72.00 Hz (GTF) hsync: 76.82 kHz; pclk: 132.75 MHz
>   	ModeLine "1280x1024_72.00"  132.75  1280 1368 1504 1728  1024 1025
> 1028 1067 -HSync +Vsync
> EndSection
> 
> Section "Device"
> 	Identifier  "Videocard0"
> 	Driver      "i810"
> 	VendorName  "Videocard vendor"
> 	BoardName   "Intel 915"
> EndSection
> 
> Section "Screen"
> 	Identifier "Screen0"
> 	Device     "Videocard0"
> 	Monitor    "Monitor0"
> 	DefaultDepth     24
> 	SubSection "Display"
> 		Viewport   0 0
> 		Depth     24
> 		Modes    "1280x1024_72.00" "1280x1024" "1152x864" "1024x768" "800x600"
> "640x480"
> 	EndSubSection
> EndSection
> 
> I have taken a look at Bug 132276:
> 
> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=132267
> 
> Since this sounded like a similar problem, i tried adding the "NoAccel"
> option. All this did was make scrolling really slow, the blurriness was
> still present. Any thoughts would be GREATLY appreciated! Thanks!
> 
> Ryan-

You may experiment with different modelines and sync settings. On
http://xtiming.sourceforge.net/cgi-bin/xtiming.pl I calculated following modeline
based on your refresh rate values (are they correct and match the
display manual data?):

Modeline "1280x1024 72" 147.56 1280 1312 1872 1904 1024 1044 1056 1076

Alexander


-- 
Alexander Dalloz | Enger, Germany | GPG http://pgp.mit.edu 0xB366A773
legal statement: http://www.uni-x.org/legal.html
Fedora Core 2 GNU/Linux on Athlon with kernel 2.6.11-1.35_FC2smp 
Serendipity 19:53:08 up 1 day, 2:45, load average: 0.18, 0.16, 0.23 

Attachment: signature.asc
Description: Dies ist ein digital signierter Nachrichtenteil


[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]