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My system has been working fine for about a year now on 12.04 LTS, But after installing the latest updates, (kernel 3.2.0.40) my system won't boot, dying on a black screen (non responsive, even not a terminal screens available) Need to hard power down or (Ctrl+alt+prtsc+R+E+I+S+U+B). If it does pass and boot, it has weird behavior, and is unstable.

System:

HP pavilion DV7-6190ed
intel core i72630QM @ 2.00GHz x 8  //  8G ram  // 2x 750Gb HD // Blue ray / DVD drive

Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09)
VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05)
Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5)
PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b5)
PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b5)
PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b5)
USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05)
ISA bridge: Intel Corporation HM65 Express Chipset Family LPC Controller (rev 05)
SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller (rev 05)
SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05)
VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Whistler XT [AMD Radeon HD 6700M Series] (rev ff)
Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)
Network controller: Intel Corporation Centrino Wireless-N 1030 (rev 34)
Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5116 PCI Express Card Reader (rev 01)
USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04)

What I have noticed by trial on error.

If I boot in older kernel versions, it works all fine up to kernel 3.2.0.38

Then I found out to be able to boot in 3.2.0.40, I need to boot in 3.2.0.38 first, and then switch my VGA to the integrated one. (I don't use the Radion discrete card, because it uses too much battery and I don't really need the fast graphics) so after I do

int terminal screen as root (sudo su)

echo IDG > /sys/kernel/debug/vgaswitcheroo/switch
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

so I get this when I cat /sys/kernel/debug/vgaswitcheroo/switch :

0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Off:0000:01:00.0

When I now restart I can boot in the newest kernel 3.2.0.40 and the system works kind of okay. but not very stable. still some stuff will crash the machine. (ex. screen shot of a screen partial. As soon I select the zone I want to capture, the system completely locks up)

The strange thing is that I always have those switcheroo settings done in all previous kernel versions and it always worked after reboots. but in this version it seem to break it, and leaving me to do it manually every time (in older kernel versions first)

I think it seems to be an issue with the VGA drivers being wrongful detected ...?? Anybody have Ideas? Or should I just upgrade to 13.04 in a week or so? (although I would rather stay on LTS for my production machine) ...

thanks in advance for any hints tips and help.

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After upgrade to Kernel 3.2.0.41: Boot problem seems to be solved , however, few other things are broken (ex. empathy - account manager) –  mario.s May 6 '13 at 11:40
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