Bug 19495

Summary:

[945GM] Blank screen and (EE) intel(0): overrun on pipe B!

Product:

xorg

Reporter:

Bryce Harrington <bryce>

Component:

Driver/intel

Assignee:

Jesse Barnes <jbarnes>

Status:

RESOLVED FIXED

QA Contact:

Xorg Project Team <xorg-team>

Severity:

major

Priority:

medium

CC:

adsouza

Version:

7.3 (2007.09)

Keywords:

NEEDINFO

Hardware:

x86 (IA32)

OS:

Linux (All)

Whiteboard:

i915 platform:

i915 features:

Attachments:

Description	Flags
intel.Xorg.0.log	none
fix 945 dsparb values	none

Description Bryce Harrington 2009-01-10 01:44:25 UTC

Forwarding this report from a Ubuntu reporter:
https://bugs.edge.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/221119

[Problem]
On Ubuntu Intrepid, Fedora Core 9, and OpenSUSE 11.1 Beta 2, all show a blank (black) screen on boot.  For this hardware, the problem is seen on Hardy and Gutsy when using -intel; with -i810 it works properly.  When the issue is seen,  "(EE) intel(0): overrun on pipe B!" is written to the log as well.

[lspci]
(II) Host-to-PCI bridge:
(II) Bus 0: bridge is at (0:0:0), (0,0,9), BCTRL: 0x0008 (VGA_EN is set)
(II) PCI: 00:00:0: chip 8086,27a0 card 10cf,1378 rev 03 class 06,00,00 hdr 00

(--) PCI:*(0:2:0) Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller rev 3, Mem @ 0xf0300000/19, 0xe0000000/28, 0xf0400000/18, I/O @ 0x1800/3
(II) PCI: 00:02:0: chip 8086,27a2 card 10cf,13d8 rev 03 class 03,00,00 hdr 80


[Original Report]
The LiveCD of Intrepid Ibex Beta get a blank (black) screen once it has entered into graphics mode. The same happens with the LiveCD of Hardy and Gutsy.

The computer still works, I can hear the start sound of GDM, and I can log in from GDM, but I just can't see anything on the screen.

With the Feisty's LiveCD the problem does not occur. By viewing the xorg.conf I noticed Feisty uses the i810 driver.

Changing the xorg.conf in Hardy and forcing the use of "i810" driver the problem does not occur. Using the drivers "intel" the problem reoccurs.

In Intrepid Ibex does not work even with the i810 driver.

Notebook: Fujitsu Siemens P1620
VGA: Intel 945GM Express
LCD Native Resolution: 1280x768

lsb_release -rd: Ubuntu 8.04

apt-cache policy xserver-xorg-video-intel:
xserver-xorg-video-intel:
  Installato: 2:2.2.1-1ubuntu12
  Candidato: 2:2.2.1-1ubuntu12
  Tabella versione:
 *** 2:2.2.1-1ubuntu12 0
        500 http://na.mirror.garr.it hardy/main Packages
        100 /var/lib/dpkg/status

Comment 1 Bryce Harrington 2009-01-10 01:45:03 UTC

Created attachment 21860 [details]
intel.Xorg.0.log

Comment 2 Bryce Harrington 2009-01-10 01:45:51 UTC

it looks like with -intel the xserver is connecting Configured Monitor to VGA output, not to LVDS:

+(II) intel(0): Output VGA using monitor section Configured Monitor
+(II) intel(0): I2C bus "CRTDDC_A" initialized.
+(II) intel(0): Output LVDS has no monitor section
+(II) intel(0): I2C bus "LVDSDDC_C" initialized.
+(II) intel(0): I2C device "LVDSDDC_C:ddc2" registered at address 0xA0.
+(II) intel(0): I2C device "LVDSDDC_C:ddc2" removed.

However later in the log it sees that the VGA out is present but doesn't have anything connected to it.

Comment 3 Jesse Barnes 2009-01-28 13:03:17 UTC

Created attachment 22320 [details] [review]
fix 945 dsparb values

Can you give this patch a try?  We had the wrong DSPARB values on 945 which might have led to underruns.

Comment 4 Michael Fu 2009-02-22 22:32:04 UTC

original bug reporter confirmed his bug is gone in jaunty Jackalope. Close this one, too.

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.