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Old 08-24-2007, 07:07 PM   #1
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Registered: Jul 2006
Location: New Delhi, India
Distribution: Kubuntu 8.10
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Feisty + Intel i915 module on 915GEVL motherboard + Xorg = scrambled display


Kubuntu 7.04/Feisty Fawn on Intel 915 motherboard using onboard graphics with Samsung SyncMaster 720n (17" LCD/TFT) Max res supprt - 1280x1024 at 75 Hz.
Startup and all daily routines are normal. Problem arises when I have to shift to vt 1-6 or during shutdown. The screen is garbled with near horizontal lines. It is noticed that Top 25% of the scrambled screen shows the correct display albeit in near horizontal lines. Lower 75% of the screen is filled with garbage... that may include colors or their blocks from the display we have switched or RGB speckles or something at random. What ever it is, it is in form of those near horizontal lines on the whole screen, I think it can be called noise.
However, I can shift back to vt7 using Ctrl+Alt+F7 where everything seems normal. Here's the catch - WHEN I RESTART XSERVER USING CTRL+ALT+BACKSPACE AND THEN SHIFT TO ANY OF THE TERMINAL (VTs), EVERYTHING IS PERFECTLY FINE!!
More observations:
* If x fails during startup, for e.g. due to bad xorg.conf, vt1-6 are available.
* Testing done by uncommenting one by one the 'Screen...' lines in ServerLayout section.
* Xorg reconfigured too using 'dpkg-reconfigure xserver-xorg', no change in behavior
* Starting a new GUI session in another vt caused the same behavior to reappear even after xserver has been zapped/restarted using Ctrl+Alt+BackSpace once before in vt7
* Once the server is restarted and VTs restored, the logout screen (the one that comes while shutting down) scrambles.
* Same behavior observed in dyne:bolic
* Same behavior observed on CRT => it is an X problem

What's the difference between Monitor and Screen in xorg.conf?
What are the zeros for in 'Screen 0 "Default Screen" 0 0' and what do they stand for?

*****Current xorg.conf********All the Wacom devices have removed as i am on a desktop*****
# /etc/X11/xorg.conf (xorg X Window System server configuration file)
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
# Edit this file with caution, and see the xorg.conf(5) manual page.
# (Type "man xorg.conf" at the shell prompt.)
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
#   sudo dpkg-reconfigure -phigh xserver-xorg

Section "Files"
	FontPath	"/usr/share/fonts/X11/misc"
	FontPath	"/usr/share/fonts/X11/cyrillic"
	FontPath	"/usr/share/fonts/X11/100dpi/:unscaled"
	FontPath	"/usr/share/fonts/X11/75dpi/:unscaled"
	FontPath	"/usr/share/fonts/X11/Type1"
	FontPath	"/usr/share/fonts/X11/100dpi"
	FontPath	"/usr/share/fonts/X11/75dpi"
	# path to defoma fonts
	FontPath	"/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"

Section "Module"
	Load	"bitmap"
	Load	"dbe"
	Load	"ddc"
	Load	"dri"
	Load	"extmod"
	Load	"freetype"
	Load	"glx"
	Load	"int10"
	Load	"v4l"
	Load	"vbe"

Section "InputDevice"
	Identifier	"Generic Keyboard"
	Driver		"kbd"
	Option		"CoreKeyboard"
	Option		"XkbRules"	"xorg"
	Option		"XkbModel"	"pc105"
	Option		"XkbLayout"	"us"

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
	Option		"Device"		"/dev/input/mice"
	Option		"Protocol"		"ImPS/2"
	Option		"ZAxisMapping"		"4 5"

Section "Device"
	Identifier	"Intel 915"
	Driver		"i810"
	BusID		"PCI:0:2:0"
	Screen		0
	Option		"UseFBDev"		"true"

Section "Monitor"
	Identifier	"Generic Monitor"
	Option		"DPMS"
	HorizSync	30-65
	VertRefresh	50-75
	Gamma		1.0

Section "Screen"
	Identifier	"Default Screen"
	Device		"Intel 915"
	Monitor		"Generic Monitor"
	DefaultDepth	24
	SubSection "Display"
		Depth		1
		Modes		"1280x1024" "1024x768" "800x600" "640x480"
	SubSection "Display"
		Depth		4
		Modes		"1280x1024" "1024x768" "800x600" "640x480"
	SubSection "Display"
		Depth		8
		Modes		"1280x1024" "1024x768" "800x600" "640x480"
	SubSection "Display"
		Depth		15
		Modes		"1280x1024" "1024x768" "800x600" "640x480"
	SubSection "Display"
		Depth		16
		Modes		"1280x1024" "1024x768" "800x600" "640x480"
	SubSection "Display"
		Depth		24
		Modes		"1280x1024" "1024x768" "800x600" "640x480"

Section "ServerLayout"
	Identifier	"Default Layout"
	Screen		"Default Screen"
	#Screen	0	"Default Screen" 0 0
	InputDevice	"Generic Keyboard"
	InputDevice	"Configured Mouse"

Section "DRI"
	Mode	0666
*************************************More Info*****************************************
lspci -v
(when run as normal root)

00:02.0 VGA compatible controller: Intel Corporation 82915G/GV/910GL Integrated Graphics Controller (rev 04) (prog-if 00 [VGA])
Subsystem: Intel Corporation Unknown device 4556
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at ff480000 (32-bit, non-prefetchable) [size=512K]
I/O ports at ec00 [size=8]
Memory at d0000000 (32-bit, prefetchable) [size=256M]
Memory at ff440000 (32-bit, non-prefetchable) [size=256K]
Capabilities: [d0] Power Management version 2

i915 24448 2
drm 81044 3 i915
video 16388 0

Exact problem for redhat
Old 08-25-2007, 11:56 AM   #2
LQ Newbie
Registered: Jul 2006
Location: New Delhi, India
Distribution: Kubuntu 8.10
Posts: 24

Original Poster
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Duplicate Thread

oops! duplicate thread... SORRY! I dont know how did this happen... mods if u could please delete this...

My updates are here:
Old 08-25-2007, 02:08 PM   #3
Registered: Nov 2002
Location: Kent, England
Distribution: Debian Testing
Posts: 19,192
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Well spotted This one is closed, please continue the discussion in the thread posted by devghai.

Closed Thread

screen resolution, xorg

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