Ubuntu
linux package

Blank screen on laptop unless glx and dri modules disabled

Bug #220852 reported by Randall Ross
4
Affects Status Importance Assigned to Milestone
X.Org X server
Fix Released
Medium
linux (Ubuntu)
Fix Released
Medium
Unassigned

Bug Description

8.04 on a Sharp MM20 laptop (ATI Radeon Mobility graphics chipset) will partially boot, but as X starts, the screen goes blank (no display, no backlight). Cannot CTRL-ALT-F1 or CTRL-ALT-ESC... no effect.

If X is invoked from command prompt (using startx), system completely hangs.

Plugging in an external monitor will allow the laptop to boot normally (with display mirrored on both screens) but this is not a viable option for a portable system.

Xorg bug in the detection of the screen/graphics for this system?

See original description
Revision history for this message
Randall Ross (randall) wrote :

localhost:~$ lspci -vvnn
01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Radeon Mobility M6 LY [1002:4c59] (prog-if 00 [VGA controller])
 Subsystem: Sharp corporation Unknown device [13bd:103b]
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR+ FastB2B+
 Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
 Latency: 66 (2000ns min), Cache Line Size: 32 bytes
 Interrupt: pin A routed to IRQ 10
 Region 0: Memory at f0000000 (32-bit, prefetchable) [size=128M]
 Region 1: I/O ports at 2000 [size=256]
 Region 2: Memory at e8100000 (32-bit, non-prefetchable) [size=64K]
 [virtual] Expansion ROM at e8120000 [disabled] [size=128K]
 Capabilities: <access denied>

Revision history for this message
Randall Ross (randall) wrote :
Revision history for this message
Randall Ross (randall) wrote :
Revision history for this message
Bryce Harrington (bryce) wrote :

Can you try using the NoDDC option to see if that makes a difference?

Changed in xorg-server:
status: New → Incomplete
Revision history for this message
Randall Ross (randall) wrote : Re: [Bug 220852] Re: Blank screen on laptop

No difference. Same result as before.

Bryce Harrington wrote:
> Can you try using the NoDDC option to see if that makes a difference?
>
>
> ** Changed in: xorg-server (Ubuntu)
> Status: New => Incomplete
>
>

Revision history for this message
Randall Ross (randall) wrote : Re: Blank screen on laptop

Confirmed that bug still present in Ubuntu 8.04.1.

System completely hangs with no disk access and no ability to escape to shell.

Randall Ross (randall)
description: updated
Revision history for this message
Randall Ross (randall) wrote :

No effect. Same result as before.

Revision history for this message
Randall Ross (randall) wrote :

Found a ¨workaround¨, but it is not ideal.

1. Boot using recovery kernel (press ESC key when GRUB menu appears)
2. Edit /etc/X11/xorg.conf adding the following code:

   Section ¨Module¨
       Disable ¨glx¨
       Disable ¨dri¨
   EndSection

Revision history for this message
Randall Ross (randall) wrote :

A similar problem has been documented in the Kernel Bug Tracker. Could it be that a kernel patch needs to be included? Seems this problem was fixed at least once before!
See http://bugzilla.kernel.org/show_bug.cgi?id=4513

Bryce Harrington (bryce)
Changed in xorg-server:
importance: Undecided → Medium
status: Incomplete → Triaged
Bug Watch Updater (bug-watch-updater)
Changed in xorg-server:
status: Unknown → Fix Released
Revision history for this message
Bryce Harrington (bryce) wrote :

According to the upstream bug report, this is actually an issue in the linux kernel and it is now believed fixed. If you find you can still reproduce this issue with the Karmic kernel, please do feel free to reopen it, and provide updated details as relevant.

affects: xorg-server (Ubuntu) → linux (Ubuntu)
Changed in linux (Ubuntu):
status: Triaged → Fix Released
Bug Watch Updater (bug-watch-updater)
Changed in xorg-server:
importance: Unknown → Medium
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