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I've been running 10.04 since Alpha 2. I have a HP Compaq 8510p laptop with a Radeon HD 2600 GFX card. I've connected an extra screen (HP 19" - max resolution 1280x1024x60hz).
Now, the dualscreen setup has been working flawlessly, until one of the fixes upgraded the kernel. Anything after 2.6.32-10-generic has been causing HSYNC problems on the extra screen. It looks like every other horizontally line is at least 1 pixel off horizontally, and this pattern scrolls downward, making the dual screen impossible to use.
When I boot with grub, kernels <= 2.6.32-10-generic works perfect. Anything above causes this behaviour. Not only in X but also using the console (which per default seems to run some VESA graphics resolution), which leads me to believe there is something awry with the radeon kernel module or similar.
I've checked /boot/grub/grub.cfg, but there is no difference between the boot entries.

I hope the source of this can be found & fixed as I cannot go above any
kernel revision >2.6.32-10-generic until it's fixed.

Let me know if you need any configurations, file versions or otherwise.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: upstart 0.6.5-6
ProcVersionSignature: Ubuntu 2.6.32-10.14-generic
Uname: Linux 2.6.32-10-generic i686
Architecture: i386
Date: Tue Apr  6 08:18:51 2010
ExecutablePath: /sbin/init
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha i386 (20100113)
ProcAttrCurrent: unconfined (enforce)
ProcEnviron: PATH=(custom, no user)
SourcePackage: upstart
--- 
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  aje        1569 F.... pulseaudio
 /dev/snd/pcmC0D0p:   aje        1569 F...m pulseaudio
 /dev/snd/controlC1:  aje        1569 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xe4544000 irq 17'
   Mixer name	: 'Analog Devices AD1981'
   Components	: 'HDA:11d41981,103c30c5,00100200'
   Controls      : 12
   Simple ctrls  : 10
Card1.Amixer.info:
 Card hw:1 'U0x46d0x8c9'/'USB Device 0x46d:0x8c9 at usb-0000:00:1a.7-2.4.1.2, full speed'
   Mixer name	: 'USB Mixer'
   Components	: 'USB046d:08c9'
   Controls      : 2
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'Mic',0
   Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
   Capture channels: Mono
   Limits: Capture 0 - 3072
   Mono: Capture 0 [0%] [18.00dB] [on]
Card2.Amixer.info:
 Card hw:2 'HDMI'/'HDA ATI HDMI at 0xe4410000 irq 17'
   Mixer name	: 'ATI R6xx HDMI'
   Components	: 'HDA:1002aa01,00aa0100,00100000'
   Controls      : 4
   Simple ctrls  : 1
Card2.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [off]
DistroRelease: Ubuntu 10.04
HibernationDevice: RESUME=UUID=c87e9de4-a625-4565-96e6-eeb74e84325f
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha i386 (20100113)
MachineType: Hewlett-Packard HP Compaq 8510p
Package: linux (not installed)
PccardctlStatus:
 Socket 0:
   no card
 Socket 1:
   3.3V 16-bit PC Card
   Subdevice 0 (function 0) bound to driver "pata_pcmcia"
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-19-generic root=UUID=5fd33c47-7c79-441d-8836-b8244c33c2dd ro quiet splash
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_DK.utf8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
Regression: Yes
RelatedPackageVersions: linux-firmware 1.33
Reproducible: Yes
RfKill:
 0: phy0: Wireless LAN
 	Soft blocked: no
 	Hard blocked: yes
Tags: lucid graphics regression-release needs-upstream-testing
Uname: Linux 2.6.32-19-generic i686
UserGroups:
 
dmi.bios.date: 12/02/2008
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68MVD Ver. F.15
dmi.board.name: 30C5
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 71.36
dmi.chassis.asset.tag: CNU7470TD2
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68MVDVer.F.15:bd12/02/2008:svnHewlett-Packard:pnHPCompaq8510p:pvrF.15:rvnHewlett-Packard:rn30C5:rvrKBCVersion71.36:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP Compaq 8510p
dmi.product.version: F.15
dmi.sys.vendor: Hewlett-Packard

** Affects: xserver-xorg-video-ati (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: apport-bug apport-collected i386 lucid
-- 
Radeon HD 2600 - Dualscreen problem
https://bugs.launchpad.net/bugs/556232
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